%%% -*-BibTeX-*- %%% ==================================================================== %%% BibTeX-file{ %%% author = "Nelson H. F. Beebe", %%% version = "2.22", %%% date = "05 March 2014", %%% time = "07:59:52 MST", %%% filename = "pods.bib", %%% address = "University of Utah %%% Department of Mathematics, 110 LCB %%% 155 S 1400 E RM 233 %%% Salt Lake City, UT 84112-0090 %%% USA", %%% telephone = "+1 801 581 5254", %%% FAX = "+1 801 581 4148", %%% URL = "http://www.math.utah.edu/~beebe", %%% checksum = "05005 53289 252151 2767274", %%% email = "beebe at math.utah.edu, beebe at acm.org, %%% beebe at computer.org (Internet)", %%% codetable = "ISO/ASCII", %%% keywords = "bibliography; database systems; Management of %%% Data; Principles of Database Systems (PODS); %%% SIGACT; SIGMOD", %%% license = "public domain", %%% supported = "yes", %%% docstring = "This is a BibTeX bibliography for the ACM %%% SIGACT-SIGMOD Symposia on Principles of %%% Database Systems (PODS 'xx) (1982--date), and %%% the ACM SIGMOD Conferences on Management of %%% Data (SIGMOD 'xx) (1975--date). These %%% conferences are generally held together, and in %%% several cases, the SIGMOD 'xx proceedings %%% have been published as an issue of the %%% journal SIGMOD Record. %%% %%% Version 1.00 of this bibliography covered only %%% the PODS 'xx symposia; at version 2.00, %%% entries for the SIGMOD 'xx conferences were %%% added. %%% %%% The companion bibliography tods.bib covers %%% the ACM Transactions on Database Systems, and %%% the companion bibliography vldb.bib covers %%% the International Conferences on Very Large %%% Data Bases. %%% %%% The publisher maintains World Wide Web sites %%% for these conference proceedings at %%% %%% http://www.sigmod.org/publications/literature %%% http://www.sigmod.org/sigmod-pods-conferences %%% http://www.sigmod.org/<YEAR>/ %%% %%% with entries for 1985--date. PDF files with %%% full text of articles are available to %%% qualified subscribers. All of the papers %%% listed at that Web site are included in this %%% bibliography. %%% %%% Although all proceedings volumes onward from %%% the first in 1982 are included here, the %%% proceedings contents are not yet available %%% for all years: most of the entries for %%% 1975--1984 are still missing. %%% %%% At version 2.22, the year coverage looked %%% like this: %%% %%% 1975 ( 1) 1988 ( 90) 2001 ( 115) %%% 1976 ( 2) 1989 ( 83) 2002 ( 110) %%% 1977 ( 1) 1990 ( 85) 2003 ( 117) %%% 1978 ( 1) 1991 ( 79) 2004 ( 119) %%% 1979 ( 1) 1992 ( 131) 2005 ( 36) %%% 1980 ( 1) 1993 ( 119) 2006 ( 40) %%% 1981 ( 0) 1994 ( 111) 2007 ( 32) %%% 1982 ( 4) 1995 ( 135) 2008 ( 32) %%% 1983 ( 3) 1996 ( 95) 2009 ( 31) %%% 1984 ( 6) 1997 ( 96) 2010 ( 32) %%% 1985 ( 57) 1998 ( 122) 2011 ( 29) %%% 1986 ( 32) 1999 ( 122) 2012 ( 31) %%% 1987 ( 85) 2000 ( 85) 2013 ( 29) %%% %%% Article: 1 %%% InProceedings: 2238 %%% Proceedings: 61 %%% %%% Total entries: 2300 %%% %%% This bibliography was initially built from %%% searches in the OCLC Content1st database. %%% Additions were then made from all of the %%% bibliographies in the TeX User Group %%% collection, from bibliographies in the %%% author's personal files, from the IEEE %%% INSPEC CD-ROM database (1989--1995), from %%% the Compendex database, from the American %%% Mathematical Society MathSciNet database, %%% and from the computer science bibliography %%% collection on ftp.ira.uka.de in %%% /pub/bibliography to which many people of %%% have contributed. The snapshot of this %%% collection was taken on 5-May-1994, and it %%% consists of 441 BibTeX files, 2,672,675 %%% lines, 205,289 entries, and 6,375 %%% <at>String{} abbreviations, occupying %%% 94.8MB of disk space. %%% %%% Numerous errors in the sources noted above %%% have been corrected. Spelling has been %%% verified with the UNIX spell and GNU ispell %%% programs using the exception dictionary %%% stored in the companion file with extension %%% .sok. %%% %%% BibTeX citation tags are uniformly chosen as %%% name:year:abbrev, where name is the family %%% name of the first author or editor, year is a %%% 4-digit number, and abbrev is a 3-letter %%% condensation of important title words. %%% Citation labels were automatically generated %%% by software developed for the BibNet Project. %%% %%% In this bibliography, entries are sorted in %%% publication order, with the help of ``bibsort %%% -byvolume''. The bibsort utility is available %%% from ftp.math.utah.edu in /pub/tex/bib. %%% %%% The checksum field above contains a CRC-16 %%% checksum as the first value, followed by the %%% equivalent of the standard UNIX wc (word %%% count) utility output of lines, words, and %%% characters. This is produced by Robert %%% Solovay's checksum utility.", %%% } %%% ====================================================================

@Preamble{ "\hyphenation{ }" # "\ifx \undefined \TM \def \TM {${}^{\sc TM}$} \fi" }

%%% ==================================================================== %%% Acknowledgement abbreviations:

@String{ack-nhfb= "Nelson H. F. Beebe, University of Utah, Department of Mathematics, 110 LCB, 155 S 1400 E RM 233, Salt Lake City, UT 84112-0090, USA, Tel: +1 801 581 5254, FAX: +1 801 581 4148, e-mail: \path|beebe@math.utah.edu|, \path|beebe@acm.org|, \path|beebe@computer.org| (Internet), URL: \path|http://www.math.utah.edu/~beebe/|"}

%%% ==================================================================== %%% Journal abbreviations:

@String{j-SIGACT-SIGMOD-SYMP-PODS= "ACM SIGACT-SIGMOD Symposium on Principles of Database Systems"} @String{j-SIGMOD= "SIGMOD Record (ACM Special Interest Group on Management of Data)"}

%%% ==================================================================== %%% Publishers and their addresses:

@String{pub-ACM= "ACM Press"} @String{pub-ACM:adr= "New York, NY 10036, USA"} @String{pub-AP= "Academic Press"} @String{pub-AP:adr= "New York, USA"} @String{pub-WORLD-SCI= "World Scientific Publishing Co."} @String{pub-WORLD-SCI:adr= "Singapore; Philadelphia, PA, USA; River Edge, NJ, USA"}

%%% ==================================================================== %%% Bibliography entries:

@Article{Lin:1976:DRA, author = "C. S. Lin and D. C. P. Smith and J. M. Smith", title = "The Design of a Rotating Associative Array Memory for a Relational Database Management Application", journal = j-SIGACT-SIGMOD-SYMP-PODS, volume = "1", number = "1", pages = "??--??", month = mar, year = "1976", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", note = "Also published in/as: Proceedings of the First Conference on Very Large Databases, Morgan Kaufman pubs. (Los Altos CA), Kerr (ed.), 1975, pp. 453--455.", annote = "Data analysis in the file control unit.", } @InProceedings{Kuck:1982:URD, author = "S. M. Kuck and Y. Sagiv", title = "A Universal Relation Database System Implemented Via the Network Model", crossref = "ACM:1982:PPA", pages = "??--??", year = "1982", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", annote = "A Subset of a CODASYL implementation is used to provide for universal relations. Lossless joins are related to automatic, mandatory sets. Both schema design and access path optimization is presented.", } @InProceedings{Chandra:1983:HCF, author = "A. K. Chandra and D. Harel", title = "{Horn} clauses and the fixpoint query hierarchy", crossref = "ACM:1983:PPS", pages = "??--??", year = "1983", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", annote = "on the complexity of answering queries defined by logical rules", } @InProceedings{Cosmadakis:1984:FID, author = "S. S. Cosmadakis and P. C. Kanellakis", title = "Functional and Inclusion Dependencies: a graph-theoretic Approach", crossref = "ACM:1984:PPT", pages = "??--??", year = "1984", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", annote = "Ownership.", } @InProceedings{Lehman:1984:KCK, author = "D. Lehman", title = "Knowledge, Common Knowledge, and Related Puzzles", crossref = "ACM:1984:PPT", pages = "??--??", year = "1984", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Pitelli:1984:BAU, author = "F. Pitelli and H. Garc{\'\i}a-Molina and S. Davidson", title = "Is {Byzantine} Agreement Useful in a Distributed Database System", crossref = "ACM:1984:PPT", pages = "??--??", year = "1984", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", note = "Also published in/as: to appear in ACM Transactions on Database Systems 1985.", } @InProceedings{Stemple:1984:SVA, author = "D. Stemple and T. Sheard", title = "Specification and Verification of Abstract Database Types", crossref = "ACM:1984:PPT", pages = "??--??", year = "1984", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", annote = "All integrity constraints are Schema declarations", } @InProceedings{Ozsoyoglu:1985:LPO, author = "Gultekin Ozsoyoglu and Z. Meral Ozsoyoglu and Francisco Mata", title = "A language and a physical organization technique for summary tables", crossref = "Navathe:1985:PAS", pages = "3--16", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p3-ozsoyoglu/p3-ozsoyoglu.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p3-ozsoyoglu/", acknowledgement = ack-nhfb, } @InProceedings{Roussopoulos:1985:DSS, author = "Nick Roussopoulos and Daniel Leifker", title = "Direct spatial search on pictorial databases using packed {R}-trees", crossref = "Navathe:1985:PAS", pages = "17--31", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p17-roussopoulos/p17-roussopoulos.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p17-roussopoulos/", acknowledgement = ack-nhfb, } @InProceedings{Christodoulakis:1985:IAD, author = "S. Christodoulakis", title = "Issues in the architecture of a document archiver using optical disk technology", crossref = "Navathe:1985:PAS", pages = "34--50", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p34-christodoulakis/p34-christodoulakis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p34-christodoulakis/", acknowledgement = ack-nhfb, } @InProceedings{Barbic:1985:TMO, author = "F. Barbic and B. Pernici", title = "Time modeling in office information systems", crossref = "Navathe:1985:PAS", pages = "51--62", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p51-barbic/p51-barbic.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p51-barbic/", acknowledgement = ack-nhfb, } @InProceedings{Faloutsos:1985:SFD, author = "Chris Faloutsos", title = "Signature files: design and performance comparison of some signature extraction methods", crossref = "Navathe:1985:PAS", pages = "63--82", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p63-faloutsos/p63-faloutsos.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p63-faloutsos/", acknowledgement = ack-nhfb, } @InProceedings{Eick:1985:ATK, author = "Christoph F. Eick and Peter C. Lockemann", title = "Acquisition of terminological knowledge using database design techniques", crossref = "Navathe:1985:PAS", pages = "84--94", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p84-eick/p84-eick.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p84-eick/", acknowledgement = ack-nhfb, } @InProceedings{Shin:1985:PRD, author = "D. G. Shin and K. B. Irani", title = "Partitioning a relational database horizontally using a knowledge-based approach", crossref = "Navathe:1985:PAS", pages = "95--105", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p95-shin/p95-shin.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p95-shin/", acknowledgement = ack-nhfb, } @InProceedings{Agrawal:1985:MSC, author = "Rakesh Agrawal and Michael J. Carey and Miron Livny", title = "Models for studying concurrency control performance: alternatives and implications", crossref = "Navathe:1985:PAS", pages = "108--121", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p108-agrawal/p108-agrawal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p108-agrawal/", acknowledgement = ack-nhfb, } @InProceedings{Robinson:1985:FGP, author = "John T. Robinson", title = "A fast general-purpose hardware synchronization mechanism", crossref = "Navathe:1985:PAS", pages = "122--130", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p122-robinson/p122-robinson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p122-robinson/", acknowledgement = ack-nhfb, } @InProceedings{Agrawal:1985:RAM, author = "Rakesh Agrawal and David J. DeWitt", title = "Recovery architectures for multiprocessor database machines", crossref = "Navathe:1985:PAS", pages = "131--145", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p131-agrawal/p131-agrawal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p131-agrawal/", acknowledgement = ack-nhfb, } @InProceedings{Batini:1985:DDM, author = "Carlo Batini and Stefano Ceri and Al Hershey and George Gardarin and David Reiner", title = "Database design: methodologies, tools, and environments (panel session)", crossref = "Navathe:1985:PAS", pages = "148--150", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p148-batini/p148-batini.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p148-batini/", acknowledgement = ack-nhfb, } @InProceedings{Hsu:1985:ICM, author = "Arding Hsu and Tomasz Imielinski", title = "Integrity checking for multiple updates", crossref = "Navathe:1985:PAS", pages = "152--168", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/citations/proceedings/mod/318898/p152-hsu/", acknowledgement = ack-nhfb, } @InProceedings{Kung:1985:VDT, author = "C. H. Kung", title = "On verification of database temporal constraints", crossref = "Navathe:1985:PAS", pages = "169--179", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p169-kung/p169-kung.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p169-kung/", acknowledgement = ack-nhfb, } @InProceedings{Kuper:1985:EPL, author = "Gabriel M. Kuper and Moshe Y. Vardi", title = "On the expressive power of the logical data model: preliminary report", crossref = "Navathe:1985:PAS", pages = "180--187", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p180-kuper/p180-kuper.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p180-kuper/", acknowledgement = ack-nhfb, } @InProceedings{Larson:1985:EPH, author = "Per-Ake Larson and M. V. Ramakrishna", title = "External perfect hashing", crossref = "Navathe:1985:PAS", pages = "190--200", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p190-larson/p190-larson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p190-larson/", acknowledgement = ack-nhfb, } @InProceedings{Kawagoe:1985:MDH, author = "Kyoji Kawagoe", title = "Modified dynamic hashing", crossref = "Navathe:1985:PAS", pages = "201--213", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p201-kawagoe/p201-kawagoe.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p201-kawagoe/", acknowledgement = ack-nhfb, } @InProceedings{Otoo:1985:MDH, author = "Ekow J. Otoo", title = "A multidimensional digital hashing scheme for files with composite keys", crossref = "Navathe:1985:PAS", pages = "214--229", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p214-otoo/p214-otoo.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p214-otoo/", acknowledgement = ack-nhfb, } @InProceedings{Sibley:1985:PDM, author = "Edgar H. Sibley and Matthias Jarke and Cecil S. McMinn and John Murray and Randall Rustin and Ken Sloan", title = "Pragmatics of database management (panel session)", crossref = "Navathe:1985:PAS", pages = "232--234", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p232-sibley/p232-sibley.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p232-sibley/", acknowledgement = ack-nhfb, } @InProceedings{Snodgrass:1985:TTD, author = "Richard Snodgrass and Ilsoo Ahn", title = "A taxonomy of time databases", crossref = "Navathe:1985:PAS", pages = "236--246", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p236-snodgrass/p236-snodgrass.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p236-snodgrass/", acknowledgement = ack-nhfb, } @InProceedings{Clifford:1985:AHR, author = "James Clifford and Abdullah Uz Tansel", title = "On an algebra for historical relational databases: two views", crossref = "Navathe:1985:PAS", pages = "247--265", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p247-clifford/p247-clifford.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p247-clifford/", acknowledgement = ack-nhfb, } @InProceedings{Copeland:1985:DSM, author = "George P. Copeland and Setrag N. Khoshafian", title = "A decomposition storage model", crossref = "Navathe:1985:PAS", pages = "268--279", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p268-copeland/p268-copeland.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p268-copeland/", acknowledgement = ack-nhfb, } @InProceedings{Yu:1985:AIS, author = "C. T. Yu and C. H. Chen", title = "Adaptive information system design: one query at a time", crossref = "Navathe:1985:PAS", pages = "280--290", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p280-yu/p280-yu.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p280-yu/", acknowledgement = ack-nhfb, } @InProceedings{Beckley:1985:MRK, author = "D. A. Beckley and M. W. Evens and V. K. Raman", title = "Multikey retrieval from {K-d} trees and {QUAD-trees}", crossref = "Navathe:1985:PAS", pages = "291--301", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p291-beckley/p291-beckley.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p291-beckley/", acknowledgement = ack-nhfb, } @InProceedings{Christodoulakis:1985:MDM, author = "Starvos Christodoulakis and D. Badal and A. Cardenas and P. Mantey and F. Tompa and D. Tsichritzis", title = "Multimedia database management (panel session)", crossref = "Navathe:1985:PAS", pages = "304--305", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p304-christodoulakis/p304-christodoulakis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p304-christodoulakis/", acknowledgement = ack-nhfb, } @InProceedings{Fushimi:1985:APE, author = "Shinya Fushimi and Masaru Kitsuregawa and Masaya Nakayama and Hidehiko Tanaka and Tohru Moto-oka", title = "Algorithm and performance evaluation of adaptive multidimensional clustering technique", crossref = "Navathe:1985:PAS", pages = "308--318", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p308-fushimi/p308-fushimi.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p308-fushimi/", acknowledgement = ack-nhfb, } @InProceedings{Kamel:1985:MDD, author = "Nabil Kamel and Roger King", title = "A model of data distribution based on texture analysis", crossref = "Navathe:1985:PAS", pages = "319--325", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p319-kamel/p319-kamel.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p319-kamel/", acknowledgement = ack-nhfb, } @InProceedings{Goldman:1985:IIS, author = "Kenneth J. Goldman and Sally A. Goldman and Paris C. Kanellakis and Stanley B. Zdonik", title = "{ISIS}: interface for a semantic information system", crossref = "Navathe:1985:PAS", pages = "328--342", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p328-goldman/p328-goldman.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p328-goldman/", acknowledgement = ack-nhfb, } @InProceedings{Vossen:1985:HLU, author = "Gottfried Vossen and Volkert Brosda", title = "A high-level user interface for update and retrieval in relational databases--language aspects", crossref = "Navathe:1985:PAS", pages = "343--353", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p343-vossen/p343-vossen.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p343-vossen/", acknowledgement = ack-nhfb, } @InProceedings{Demo:1985:ACD, author = "G. Barbara Demo and Sukhamay Kundu", title = "Analysis of the context dependency of {CODASYL} find-statements with application to a database program conversion", crossref = "Navathe:1985:PAS", pages = "354--361", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p354-demo/p354-demo.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p354-demo/", acknowledgement = ack-nhfb, } @InProceedings{Acharya:1985:TRP, author = "Shridhar Acharya and Gael Buckley", title = "Transaction restarts in {Prolog} database systems", crossref = "Navathe:1985:PAS", pages = "364--373", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p364-acharya/p364-acharya.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p364-acharya/", acknowledgement = ack-nhfb, } @InProceedings{Page:1985:GDD, author = "Thomas W. Page and Matthew J. Weinstein and Gerald J. Popek", title = "Genesis: a distributed database operating system", crossref = "Navathe:1985:PAS", pages = "374--387", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p374-page/p374-page.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p374-page/", acknowledgement = ack-nhfb, } @InProceedings{Klahold:1985:TMS, author = "P. Klahold and G. Schlageter and R. Unland and W. Wilkes", title = "A transaction model supporting complex applications in integrated information systems", crossref = "Navathe:1985:PAS", pages = "388--401", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/citations/proceedings/mod/318898/p388-klahold/", acknowledgement = ack-nhfb, } @InProceedings{Sinha:1985:TBC, author = "Mukul K. Sinha and P. D. Nandikar and S. L. Mehndiratta", title = "Timestamp based certification schemes for transactions in distributed database systems", crossref = "Navathe:1985:PAS", pages = "402--411", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p402-sinha/p402-sinha.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p402-sinha/", acknowledgement = ack-nhfb, } @InProceedings{Kerschberg:1985:EDS, author = "Larry Kerschberg and Michael Brodie and Charles Kellogg and D. Stott Parker and Gio Wiederhold and Carlo Zaniolo", title = "Expert database systems (workshop review)", crossref = "Navathe:1985:PAS", pages = "414--417", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p414-kerschberg/p414-kerschberg.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p414-kerschberg/", acknowledgement = ack-nhfb, } @InProceedings{Bhargava:1985:RDD, author = "Bharat Bhargava", title = "Reliability in distributed database systems (panel discussion)", crossref = "Navathe:1985:PAS", pages = "420--422", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p420-bhargava/p420-bhargava.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p420-bhargava/", acknowledgement = ack-nhfb, } @InProceedings{Sellis:1985:OED, author = "Timos K. Sellis and Leonard Shapiro", title = "Optimization of extended database query languages", crossref = "Navathe:1985:PAS", pages = "424--436", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p424-sellis/p424-sellis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p424-sellis/", acknowledgement = ack-nhfb, } @InProceedings{Gray:1985:EPA, author = "P. M. D. Gray", title = "Efficient {Prolog} access to {CODAYSL} and {FDM} databases", crossref = "Navathe:1985:PAS", pages = "437--443", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p437-gray/p437-gray.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p437-gray/", acknowledgement = ack-nhfb, } @InProceedings{Blain:1985:MPC, author = "Tomas Blain and Michael Dohler and Ralph Michaelis and Emran Qureshi", title = "Managing the printed circuit board design process", crossref = "Navathe:1985:PAS", pages = "447--456", year = "1985", bibdate = "Wed Oct 25 08:47:38 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/318898/p447-blain/p447-blain.pdf; http://www.acm.org/pubs/citations/proceedings/mod/318898/p447-blain/", acknowledgement = ack-nhfb, } @InProceedings{Abiteboul:1985:TIC, author = "S. Abiteboul and V. Vianu", title = "Transactions and Integrity Constraints", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Atzeni:1985:EQA, author = "P. Atzeni and E. P. F. Chan", title = "Efficient Query Answering in the Representative Instance Approach", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Ausiello:1985:CPG, author = "G. Ausiello and A. D'Atri", title = "Chordality Properties on Graphs and Minimal Conceptual Connections in Semantic Data Models", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Bancilhon:1985:AVP, author = "F. Bancilhon and M. Spyratos", title = "Algebraic Versus Probabilistic Independence in Data Bases", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Casanova:1985:CLR, author = "M. A. Casanova and A. V. Moura and L. Tucherman", title = "On the Correctness of a Local Recovery Subsystem", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Cosmadakis:1985:PSR, author = "S. S. Cosmadakis and P. C. Kanellakis and N. Spyratos", title = "Partition Semantics for Relations", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Garcia-Molina:1985:EEC, author = "H. Garc{\'\i}a-Molina and J. Kent", title = "An Experimental Evaluation of Crash Recovery Mechanism", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Gyssens:1985:EJD, author = "Marc Gyssens", title = "Embedded Join Dependencies as a Tool for Decomposing Full Join Dependencies", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Keller:1985:ATV, author = "A. M. Keller", title = "Algorithms for Translating View Updates to Database Updates for Views Involving Selections, Projections, and Joins", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Mannila:1985:SAR, author = "H. Mannila and K-J. Raiha", title = "Small {Armstrong} Relations for Database Design", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Page:1985:DDM, author = "T. W. {Page, Jr.} and G. J. Popek", title = "Distributed Data Management in Local Area Networks", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Sagiv:1985:COB, author = "Yehoshua Sagiv", title = "Concurrent Operations on {B}*-Trees with Overtaking", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Sagiv:1985:CRP, author = "Yehoshua Sagiv", title = "On Computing Restricted Projections of Representative Instances", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Skeen:1985:EFT, author = "D. Skeen and F. Cristian and A. ElAbbadi", title = "An Efficient Fault-Tolerant Algorithm for Replicated Data Management", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Stein:1985:RUS, author = "J. Stein and D. Maier", title = "Relaxing the Universal Scheme Assumption", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Vardi:1985:QLD, author = "Moshe Vardi", title = "Querying Logical Databases", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Yannakakis:1985:CRC, author = "Mihalis Yannakakis and C. H. Papadimitriou", title = "The Complexity of Reliable Concurrency Control", crossref = "ACM:1985:PPF", pages = "??--??", month = mar, year = "1985", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Bancilhon:1986:MSO, author = "Fran{\c{c}}ois Bancilhon and David Maier and Yehoshua Sagiv and Jeffrey D. Ullman", title = "Magic sets and other strange ways to implement logic programs (extended abstract)", crossref = "ACM:1986:PPF", pages = "1--15", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p1-bancilhon/p1-bancilhon.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p1-bancilhon/", acknowledgement = ack-nhfb, keywords = "algorithms; languages; performance; theory", subject = "{\bf I.2.2} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Automatic Programming, Program transformation. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Logic programming. {\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Representations (procedural and rule-based). {\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Predicate logic. {\bf I.2.5} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Programming Languages and Software, Prolog. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design.", } @InProceedings{Sacca:1986:ISC, author = "Domenico Sacc{\`a} and Carlo Zaniolo", title = "On the implementation of a simple class of logic queries for databases", crossref = "ACM:1986:PPF", pages = "16--23", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p16-sacca/p16-sacca.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p16-sacca/", acknowledgement = ack-nhfb, keywords = "algorithms; languages; performance; theory", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming. {\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Predicate logic. {\bf E.1} Data, DATA STRUCTURES, Graphs and networks. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Answer/reason extraction. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design.", } @InProceedings{Afrati:1986:CSQ, author = "Foto Afrati and Christos Papadimitriou and George Papageorgiou and Athena Roussou and Yehoshua Sagiv and Jeffrey D. Ullman", title = "Convergence of sideways query evaluation", crossref = "ACM:1986:PPF", pages = "24--30", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p24-afrati/p24-afrati.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p24-afrati/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p24-afrati/", acknowledgement = ack-nhfb, keywords = "algorithms; languages; theory", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Graph algorithms. {\bf F.4.3} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Formal Languages, Classes defined by grammars or automata.", } @InProceedings{Weikum:1986:TFM, author = "Gerhard Weikum", title = "A theoretical foundation of multi-level concurrency control", crossref = "ACM:1986:PPF", pages = "31--43", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p31-weikum/p31-weikum.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p31-weikum/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p31-weikum/", acknowledgement = ack-nhfb, keywords = "algorithms; design; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Concurrency. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Scheduling. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Deadlocks.", } @InProceedings{Hadzilacos:1986:DCT, author = "Thanasis Hadzilacos and Mihalis Yannakakis", title = "Deleting completed transactions", crossref = "ACM:1986:PPF", pages = "43--46", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p43-hadzilacos/p43-hadzilacos.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p43-hadzilacos/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p43-hadzilacos/", acknowledgement = ack-nhfb, keywords = "design; theory; verification", subject = "{\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Concurrency. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Deadlocks. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Scheduling. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Graph algorithms. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models.", } @InProceedings{Su:1986:SNW, author = "Jianwen Su", title = "Safety of non-well-locked transaction systems", crossref = "ACM:1986:PPF", pages = "47--52", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p47-su/p47-su.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p47-su/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p47-su/", acknowledgement = ack-nhfb, keywords = "algorithms; design; performance; security; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Concurrency. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Deadlocks. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Scheduling. {\bf H.2.2} Information Systems, DATABASE MANAGEMENT, Physical Design, Access methods. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models.", } @InProceedings{Bancilhon:1986:CCO, author = "Fran{\c{c}}ois Bancilhon and Setrag Khoshafian", title = "A calculus for complex objects", crossref = "ACM:1986:PPF", pages = "53--60", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p53-bancilhon/p53-bancilhon.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p53-bancilhon/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p53-bancilhon/", acknowledgement = ack-nhfb, keywords = "design; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Normal forms. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Graph algorithms. {\bf F.2.2} Theory of Computation, ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY, Nonnumerical Algorithms and Problems, Computations on discrete structures. {\bf F.2.1} Theory of Computation, ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY, Numerical Algorithms and Problems, Number-theoretic computations.", } @InProceedings{VanGucht:1986:SCM, author = "Dirk {Van Gucht} and Patrick C. Fischer", title = "Some classes of multilevel relational structures", crossref = "ACM:1986:PPF", pages = "60--69", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p60-van_gucht/p60-van_gucht.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p60-van_gucht/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p60-van_gucht/", acknowledgement = ack-nhfb, keywords = "algorithms; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Normal forms. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf F.2.1} Theory of Computation, ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY, Numerical Algorithms and Problems, Number-theoretic computations.", } @InProceedings{Gadia:1986:WTR, author = "Shashi K. Gadia", title = "Weak temporal relations", crossref = "ACM:1986:PPF", pages = "70--77", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p70-gadia/p70-gadia.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p70-gadia/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p70-gadia/", acknowledgement = ack-nhfb, keywords = "design; languages; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf F.2.1} Theory of Computation, ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY, Numerical Algorithms and Problems, Number-theoretic computations. {\bf D.3.1} Software, PROGRAMMING LANGUAGES, Formal Definitions and Theory, Semantics. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Olken:1986:RDM, author = "Frank Olken and Doron Rotem", title = "Rearranging data to maximize the efficiency of compression", crossref = "ACM:1986:PPF", pages = "78--90", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p78-olken/p78-olken.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p78-olken/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p78-olken/", acknowledgement = ack-nhfb, keywords = "algorithms; design; economics; theory; verification", subject = "{\bf E.4} Data, CODING AND INFORMATION THEORY, Data compaction and compression. {\bf H.3.2} Information Systems, INFORMATION STORAGE AND RETRIEVAL, Information Storage, File organization. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models.", } @InProceedings{Robinson:1986:OPL, author = "John T. Robinson", title = "Order preserving linear hashing using dynamic key statistics", crossref = "ACM:1986:PPF", pages = "91--99", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p91-robinson/p91-robinson.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p91-robinson/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p91-robinson/", acknowledgement = ack-nhfb, keywords = "algorithms; design; experimentation; measurement; performance; theory", subject = "{\bf H.2.2} Information Systems, DATABASE MANAGEMENT, Physical Design, Access methods. {\bf E.2} Data, DATA STORAGE REPRESENTATIONS, Hash-table representations. {\bf E.5} Data, FILES, Organization/structure. {\bf D.4.3} Software, OPERATING SYSTEMS, File Systems Management, Access methods.", } @InProceedings{Otoo:1986:BME, author = "Ekow J. Otoo", title = "Balanced multidimensional extendible hash tree", crossref = "ACM:1986:PPF", pages = "100--113", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p100-otoo/p100-otoo.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p100-otoo/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p100-otoo/", acknowledgement = ack-nhfb, keywords = "algorithms; design; experimentation; theory", subject = "{\bf E.2} Data, DATA STORAGE REPRESENTATIONS, Hash-table representations. {\bf E.1} Data, DATA STRUCTURES, Trees. {\bf E.5} Data, FILES, Organization/structure. {\bf E.1} Data, DATA STRUCTURES, Arrays. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf H.2.7} Information Systems, DATABASE MANAGEMENT, Database Administration, Data dictionary/directory. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.2.2} Theory of Computation, ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY, Nonnumerical Algorithms and Problems, Sorting and searching. {\bf D.4.3} Software, OPERATING SYSTEMS, File Systems Management, Access methods.", } @InProceedings{Naqvi:1986:NFF, author = "Shamim A. Naqvi", title = "Negation as failure for first-order queries", crossref = "ACM:1986:PPF", pages = "114--122", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p114-naqvi/p114-naqvi.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p114-naqvi/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p114-naqvi/", acknowledgement = ack-nhfb, keywords = "economics; languages; performance; reliability; theory", subject = "{\bf I.2.5} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Programming Languages and Software, Prolog. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming. {\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Predicate logic. {\bf F.4.3} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Formal Languages, Classes defined by grammars or automata.", } @InProceedings{Bidoit:1986:PVM, author = "Nicole Bidoit and Richard Hull", title = "Positivism vs. minimalism in deductive databases", crossref = "ACM:1986:PPF", pages = "123--132", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p123-bidoit/p123-bidoit.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p123-bidoit/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p123-bidoit/", acknowledgement = ack-nhfb, keywords = "languages; performance; reliability; theory", subject = "{\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Deduction. {\bf H.1.m} Information Systems, MODELS AND PRINCIPLES, Miscellaneous. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Nonmonotonic reasoning and belief revision. {\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Predicate logic. {\bf D.3.1} Software, PROGRAMMING LANGUAGES, Formal Definitions and Theory, Semantics. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming.", } @InProceedings{Gelfond:1986:ECW, author = "M. Gelfond and H. Przymusinska and T. Przymusinski", title = "The extended closed world assumption and its relationship to parallel circumscription", crossref = "ACM:1986:PPF", pages = "133--139", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p133-gelfond/p133-gelfond.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p133-gelfond/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p133-gelfond/", acknowledgement = ack-nhfb, keywords = "languages; performance; reliability; theory", subject = "{\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Predicate logic. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Nonmonotonic reasoning and belief revision. {\bf H.1.m} Information Systems, MODELS AND PRINCIPLES, Miscellaneous. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Computational logic.", } @InProceedings{Chan:1986:PCC, author = "E. P. F. Chan and Paolo Atzeni", title = "On the properties and characterization of connection-trap-free schemes", crossref = "ACM:1986:PPF", pages = "140--147", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p140-chan/p140-chan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p140-chan/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p140-chan/", acknowledgement = ack-nhfb, keywords = "algorithms; design; languages; performance; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf H.3.3} Information Systems, INFORMATION STORAGE AND RETRIEVAL, Information Search and Retrieval, Retrieval models. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models.", } @InProceedings{Biskup:1986:OFA, author = "H. Biskup and L. Schnetgoke", title = "One flavor assumption and gamma-acyclicity for universal relation views", crossref = "ACM:1986:PPF", pages = "148--159", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p148-biskup/p148-biskup.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p148-biskup/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p148-biskup/", acknowledgement = ack-nhfb, keywords = "design; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models.", } @InProceedings{Sagiv:1986:ESQ, author = "Yehoshua Sagiv and Oded Shmueli", title = "The equivalence of solving queries and producing tree projections (extended abstract)", crossref = "ACM:1986:PPF", pages = "160--172", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p160-sagiv/p160-sagiv.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p160-sagiv/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p160-sagiv/", acknowledgement = ack-nhfb, keywords = "algorithms; design; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Sagiv:1986:FFA, author = "Yehoshua Sagiv", title = "On finite {FD}-acyclicity", crossref = "ACM:1986:PPF", pages = "173--182", year = "1986", bibdate = "Sun Nov 07 06:29:03 2004", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p173-sagiv/p173-sagiv.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p173-sagiv/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p173-sagiv/", acknowledgement = ack-nhfb, keywords = "algorithms; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Ozsoyoglu:1986:UFM, author = "Meral Ozsoyoglu and Li Yan Yuan", title = "Unifying functional and multivalued dependencies for relational database design", crossref = "ACM:1986:PPF", pages = "183--190", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p183-ozsoyoglu/p183-ozsoyoglu.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p183-ozsoyoglu/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p183-ozsoyoglu/", acknowledgement = ack-nhfb, keywords = "algorithms; design; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Ruland:1986:AAD, author = "Detlev Ruland and Dietmar Seipel", title = "Alpha-acyclic decompositions of relational database schemes", crossref = "ACM:1986:PPF", pages = "191--201", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p191-ruland/p191-ruland.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p191-ruland/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p191-ruland/", acknowledgement = ack-nhfb, keywords = "algorithms; design; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Normal forms. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Graph algorithms.", } @InProceedings{Graham:1986:CTM, author = "Marc H. Graham and Ke Wang", title = "Constant time maintenance or the triumph of the {FD}", crossref = "ACM:1986:PPF", pages = "202--216", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p202-graham/p202-graham.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p202-graham/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p202-graham/", acknowledgement = ack-nhfb, keywords = "algorithms; design; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Normal forms.", } @InProceedings{Mannila:1986:TDR, author = "Heikki Mannila and Kari Jouko Raiha", title = "Test data for relational queries", crossref = "ACM:1986:PPF", pages = "217--223", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p217-mannila/p217-mannila.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p217-mannila/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p217-mannila/", acknowledgement = ack-nhfb, keywords = "algorithms; languages; theory; verification", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf H.3.3} Information Systems, INFORMATION STORAGE AND RETRIEVAL, Information Search and Retrieval, Query formulation. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf D.2.5} Software, SOFTWARE ENGINEERING, Testing and Debugging, Testing tools (e.g., data generators, coverage testing).", } @InProceedings{Wilkins:1986:MTA, author = "Marianne Winslett Wilkins", title = "A model-theoretic approach to updating logical databases", crossref = "ACM:1986:PPF", pages = "224--234", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p224-wilkins/p224-wilkins.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p224-wilkins/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p224-wilkins/", acknowledgement = ack-nhfb, keywords = "algorithms; design; economics; languages; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Data manipulation languages (DML). {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Nonmonotonic reasoning and belief revision. {\bf H.1.m} Information Systems, MODELS AND PRINCIPLES, Miscellaneous. {\bf E.1} Data, DATA STRUCTURES. {\bf D.3.1} Software, PROGRAMMING LANGUAGES, Formal Definitions and Theory, Semantics. {\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Predicate logic.", } @InProceedings{Abiteboul:1986:DPT, author = "Serge Abiteboul and Victor Vianu", title = "Deciding properties of transactional schemas", crossref = "ACM:1986:PPF", pages = "235--239", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p235-abiteboul/p235-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p235-abiteboul/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p235-abiteboul/", acknowledgement = ack-nhfb, keywords = "algorithms; design; languages; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf H.1.m} Information Systems, MODELS AND PRINCIPLES, Miscellaneous. {\bf F.3.1} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Specifying and Verifying and Reasoning about Programs, Specification techniques.", } @InProceedings{ElAbbadi:1986:APR, author = "Amr {El Abbadi} and Sam Toueg", title = "Availability in partitioned replicated databases", crossref = "ACM:1986:PPF", pages = "240--251", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p240-el_abbadi/p240-el_abbadi.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p240-el_abbadi/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p240-el_abbadi/", acknowledgement = ack-nhfb, keywords = "algorithms; design; reliability; theory; verification", subject = "{\bf C.2.4} Computer Systems Organization, COMPUTER-COMMUNICATION NETWORKS, Distributed Systems, Distributed databases. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing. {\bf C.2.2} Computer Systems Organization, COMPUTER-COMMUNICATION NETWORKS, Network Protocols, Protocol architecture. {\bf D.4.1} Software, OPERATING SYSTEMS, Process Management, Concurrency. {\bf D.4.6} Software, OPERATING SYSTEMS, Security and Protection, Access controls. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf C.4} Computer Systems Organization, PERFORMANCE OF SYSTEMS, Reliability, availability, and serviceability.", } @InProceedings{Vardi:1986:IDI, author = "Moshe Vardi", title = "On the integrity of databases with incomplete information", crossref = "ACM:1986:PPF", pages = "252--266", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p252-vardi/p252-vardi.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p252-vardi/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p252-vardi/", acknowledgement = ack-nhfb, keywords = "algorithms; design; languages; theory; verification", subject = "{\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General, Security, integrity, and protection**. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf H.1.m} Information Systems, MODELS AND PRINCIPLES, Miscellaneous. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Nonmonotonic reasoning and belief revision. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema. {\bf F.1.3} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Complexity Measures and Classes, Relations among complexity classes.", } @InProceedings{Naughton:1986:DIR, author = "Jeff Naughton", title = "Data independent recursion in deductive databases", crossref = "ACM:1986:PPF", pages = "267--279", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p267-naughton/p267-naughton.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p267-naughton/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p267-naughton/", acknowledgement = ack-nhfb, keywords = "algorithms; languages; theory", subject = "{\bf I.2.4} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Knowledge Representation Formalisms and Methods, Predicate logic. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Deduction. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Recursive function theory. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Graph algorithms.", } @InProceedings{Cosmadakis:1986:PER, author = "S. Cosmadakis and P. Kanellakis", title = "Parallel evaluation of recursive rule queries", crossref = "ACM:1986:PPF", pages = "280--293", year = "1986", bibdate = "Wed Oct 25 08:47:35 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/6012/p280-cosmadakis/p280-cosmadakis.pdf; http://www.acm.org/pubs/citations/proceedings/pods/6012/p280-cosmadakis/; http://www.acm.org:80/pubs/citations/proceedings/pods/6012/p280-cosmadakis/", acknowledgement = ack-nhfb, keywords = "languages; theory; verification", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design. {\bf D.2.8} Software, SOFTWARE ENGINEERING, Metrics, Complexity measures. {\bf H.1.m} Information Systems, MODELS AND PRINCIPLES, Miscellaneous. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Recursive function theory. {\bf F.1.3} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Complexity Measures and Classes, Relations among complexity classes. {\bf G.1.0} Mathematics of Computing, NUMERICAL ANALYSIS, General, Parallel algorithms.", } @InProceedings{Abiteboul:1986:PTS, author = "S. Abiteboul and V. Vianu", title = "Properties of Transactional Schemas", crossref = "ACM:1986:PPF", pages = "??--??", month = mar, year = "1986", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", annote = "a study of optimization for insert/delete operations.", } @InProceedings{Neff:1987:DBC, author = "R. K. Neff", title = "Data bases, compound objects, and networked workstations: {Beyond} distributed computing {(Abstract)}", crossref = "Dayal:1987:PAC", pages = "1--1", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p1-neff/p1-neff.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p1-neff/", abstract = "Requirements for future data base systems are developed from the perspective of the user of a networked workstation who naturally deals with compound objects. Objects considered include full text, diagrams, maps, sound recordings, images from film and video and of art objects, spreadsheets, etc. Searching requirements and strategies over multi-objects are also considered. The context of such data base systems is the library, in its electronic or digital version. Comments are presented with respect to the digital learning environment of the future. Current related projects at Berkeley are described.", acknowledgement = ack-nhfb, generalterms = "Design; Human Factors; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Information Storage and Retrieval --- General (H.3.0); Information Systems --- Information Storage and Retrieval --- Systems and Software (H.3.4): {\bf Information networks}; Hardware --- Input/Output and Data Communications --- General (B.4.0)", } @InProceedings{Ullman:1987:DTP, author = "J. D. Ullman", title = "Database theory --- past and future", crossref = "ACM:1987:PPS", pages = "1--10", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p1-ullman/p1-ullman.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p1-ullman/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p1-ullman/", abstract = "We briefly sketch the development of the various branches of database theory. One important branch is the theory of relational databases, including such areas as dependency theory, universal-relation theory, and hypergraph theory. A second important branch is the theory of concurrency control and distributed databases. Two other branches have not in the past been given the attention they deserve. One of these is ``logic and databases,'' and the second is ``object-oriented database systems,'' which to my thinking includes systems based on the network or hierarchical data models. Both these areas are going to be more influential in the future.", acknowledgement = ack-nhfb, generalterms = "Management; Theory", keywords = "management; theory", subject = "Information Systems --- Database Management --- General (H.2.0)", } @InProceedings{Ingenthron:1987:TDR, author = "Kurt Ingenthron", title = "Thoughts on database research: a user perspective", crossref = "Dayal:1987:PAC", pages = "2--2", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p2-ingenthron/p2-ingenthron.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p2-ingenthron/", abstract = "The future of computer aided design is in object oriented programming. If the database community hopes to participate in this future, it must reexamine some basic assumptions about the architecture of database systems. Database system functionality can be added to object systems but if the performance cost is too high, it will never survive. Below are some suggestions for what can be done at a reasonable performance cost. \par The object oriented paradigm provides a more practical approach to the partitioning of the global database than horizontal and vertical partitioning of relational tables. Each partition should itself be an independent database containing related data such as the geometry of a part or the spacial relationship of parts in an assembly. A meta-database would be used to control access to collections of these partitions. A collection of partitions comprise the database for a user's design session. \par The overhead of traditional database transaction management is not acceptable for high performance CAD systems. With the partitioning scheme described above, transaction management can be performed at a partition/session granularity. Once the user has composed the collection of partitions, he has a single user database. There is no need for concurrency control or transaction logging except at the meta-database level. This type of transaction management can in fact be more functional than traditional transaction management, allowing for versioning, long transactions, integrity checking and archival. \par Object oriented databases need a message model, not a data model. Any object which responds to the same messages as an object of ``Duck'' class (walk and quack) is, for all intents and purposes, a duck. An attempt to design a data model based on instance variables of an object or based on collections of objects of like class violates the data abstraction facilities of object oriented languages and diminishes their power. An attempt to implement a relational database system with an object oriented language yields a relational database system where you get abstract data types for free. It does not yield an object oriented database system. \par For object oriented queries, the message is the media. A query can be transformed into an execution plan consisting of messages sent to database objects. Optimization decisions can be made by sending messages to referenced objects. Collection classes can be implemented for new access methods with cost and selectivity methods to provide optimization information. In this way, the query language can grow with the application. \par Data representation is an important aspect of object oriented systems. Most object systems are typeless in that all instance variables of an object are object references. For performance sake, object systems should provide enough of a type mechanism to allow simple data items (integers, floats, characters, \ldots{}) to be represented in the form intrinsic to the machine. Methods can then be compiled for access to typed data. \par In conclusion, object systems provide enormous potential for the development of CAD systems. Performance influences the approach taken to an application. WYSIWYG publishing applications were not attempted until performance was adequate. Functionality is what sells CAD systems. Database system functionality can be added to object systems at a reasonable cost.", acknowledgement = ack-nhfb, generalterms = "Design; Human Factors", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Software --- Operating Systems --- Communications Management (D.4.4): {\bf Message sending}", } @InProceedings{Ioannidis:1987:QOS, author = "Yannis E. Ioannidis and Eugene Wong", title = "Query optimization by simulated annealing", crossref = "Dayal:1987:PAC", pages = "9--22", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p9-ioannidis/p9-ioannidis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p9-ioannidis/", abstract = "Query optimizers of future database management systems are likely to face large access plan spaces in their task. Exhaustively searching such access plan spaces is unacceptable. We propose a query optimization algorithm based on {\em simulated annealing}, which is a probabilistic hill climbing algorithm. We show the specific formulation of the algorithm for the case of optimizing complex non-recursive queries that arise in the study of linear recursion. The query answer is explicitly represented and manipulated within the {\em closed semiring\/} of linear relational operators. The optimization algorithm is applied to a state space that is constructed from the equivalent algebraic forms of the query answer. A prototype of the simulated annealing algorithm has been built and few experiments have been performed for a limited class of relational operators. Our initial experience is that, in general, the algorithm converges to processing strategies that are very close to the optimal. Moreover, the traditional processing strategies (e.g., the {\em semi-naive evaluation\/}) have been found to be, in general, suboptimal.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance", subject = "Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Access methods}", } @InProceedings{Kuper:1987:LPS, author = "G. M. Kuper", title = "Logic programming with sets", crossref = "ACM:1987:PPS", pages = "11--20", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p11-kuper/p11-kuper.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p11-kuper/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p11-kuper/", acknowledgement = ack-nhfb, keywords = "languages; management; theory; verification", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Logic programming. {\bf F.4.3} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Formal Languages, Algebraic language theory.", } @InProceedings{Beeri:1987:SNL, author = "C. Beeri and S. Naqvi and R. Ramakrishnan and O. Shmueli and S. Tsur", title = "Sets and negation in a logic data base language {(LDL1)}", crossref = "ACM:1987:PPS", pages = "21--37", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p21-beeri/p21-beeri.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p21-beeri/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p21-beeri/", abstract = "In this paper we extend LDL, a Logic Based Database Language, to include finite sets and negation. The new language is called LDL1. We define the notion of a model and show that a negation-free program need not have a model, and that it may have more than one minimal model. We impose syntactic restriction in order to define a deterministic language. These restrictions allow only layered (stratified) programs. We prove that for any program satisfying the syntactic restrictions of layering, there is a minimal model, and that this model can be constructed in a bottom-up fashion. Extensions to the basic grouping mechanism are proposed. We show that these extensions can be translated into equivalent LDL1 programs. Finally, we show how the technique of magic sets can be extended to translate LDL1 programs into equivalent programs which can often be executed more efficiently", acknowledgement = ack-nhfb, generalterms = "Languages; Management; Theory; Verification", keywords = "languages; management; theory; verification", subject = "{\bf D.3.2} Software, PROGRAMMING LANGUAGES, Language Classifications. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Logic programming. {\bf D.3.1} Software, PROGRAMMING LANGUAGES, Formal Definitions and Theory.", } @InProceedings{Ganski:1987:ONS, author = "Richard A. Ganski and Harry K. T. Wong", title = "Optimization of nested {SQL} queries revisited", crossref = "Dayal:1987:PAC", pages = "23--33", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p23-ganski/p23-ganski.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p23-ganski/", abstract = "Current methods of evaluating nested queries in the SQL language can be inefficient in a variety of query and data base contexts. Previous research in the area of nested query optimization which sought methods of reducing evaluation costs is summarized, including a classification scheme for nested queries, algorithms designed to transform each type of query to a logically equivalent form which may then be evaluated more efficiently, and a description of a major bug in one of these algorithms. Further examination reveals another bug in the same algorithm. Solutions to these bugs are proposed and incorporated into a new transformation algorithm, and extensions are proposed which will allow the transformation algorithms to handle a larger class of predicates. A recursive algorithm for processing a general nested query is presented and the action of this algorithm is demonstrated. This algorithm can be used to transform any nested query.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}", } @InProceedings{Abiteboul:1987:RQS, author = "Serge Abiteboul and Paris Kanellakis and Gosta Grahne", title = "On the representation and querying of sets of possible worlds", crossref = "Dayal:1987:PAC", pages = "34--48", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p34-abiteboul/p34-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p34-abiteboul/", abstract = "We represent a {\em set of possible worlds\/} using an incomplete information database. The representation techniques that we study form a hierarchy, which generalizes relations of constants. This hierarchy ranges from the very simple Codd-table, (i.e., a relation of constants and distinct variables called nulls, which stand for values present but unknown), to much more complex mechanisms involving views on conditioned-tables, (i.e., queries on Codd-tables together with conditions). The views we consider are the queries that have polynomial data-complexity on complete information databases. Our conditions are conjunctions of equalities and inequalities. \par (1) We provide matching upper and lower bounds on the data-complexity of testing {\em containment}, {\em membership}, and {\em uniqueness\/} for sets of possible worlds and we fully classify these problems with respect to our representation hierarchy. The most surprising result in this classification is that it is complete in $2^p$, whether a set of possible worlds represented by a Codd-table is a subset of a set of possible worlds represented by a Codd-table with one conjunction of inequalities. \par (2) We investigate the data-complexity of querying incomplete information databases. We examine both asking for {\em certain facts\/} and for {\em possible facts}. Our approach is algebraic but our bounds also apply to logical databases. We show that asking for a certain fact is coNP-complete, even for a fixed first order query on a Codd-table. We thus strengthen a lower bound of [16], who showed that this holds for a Codd-table with a conjunction of inequalities. For each fixed positive existential query we present a polynomial algorithm solving the bounded possible fact problem of this query on conditioned-tables. We show that our approach is, in a sense, the best possible, by deriving two NP-completeness lower bounds for the bounded possible fact problem when the fixed query contains either negation or recursion.", acknowledgement = ack-nhfb, generalterms = "Theory", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Uncertainty, ``fuzzy,'' and probabilistic reasoning}; Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Relation systems}", } @InProceedings{Yuan:1987:LDR, author = "L. Y. Yuan and Z. M. Ozsoyoglu", title = "Logical design of relational database schemes", crossref = "ACM:1987:PPS", pages = "38--47", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p38-yuan/p38-yuan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p38-yuan/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p38-yuan/", abstract = "We define extended conflict free dependencies in the context of functional and multivalued dependencies, and prove that there exists an acyclic, dependency preserving, 4NF database scheme if and only if the given set of dependencies has an extended conflict free cover. This condition can be checked in polynomial time. A polynomial time algorithm to obtain such a scheme for a given extended conflict free set of dependencies is also presented. The result is also applicable when the data dependencies consists of only functional dependencies, giving the necessary and sufficient condition for an acyclic, dependency preserving BCNF database scheme", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Management; Theory; Verification", keywords = "algorithms; design; management; theory; verification", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Chan:1987:DDS, author = "E. P. F. Chan and H. J. Hernandez", title = "On designing database schemes bounded or constant-time maintainable with respect to functional dependencies", crossref = "ACM:1987:PPS", pages = "48--57", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p48-chan/p48-chan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p48-chan/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p48-chan/", abstract = "Under the weak instance model, to determine if a class of database schemes is bounded with respect to dependencies is fundamental for the analysis of the behavior of the class of database schemes with respect to query processing and updates. However, proving that a class of database schemes is bounded with respect to dependencies seems to be very difficult even for restricted cases. To resolve this problem, we need to develop techniques for characterizing bounded database schemes \par In this paper, we give a formal methodology for designing database schemes bounded with respect to functional dependencies using a new technique called extensibility. This methodology can also be used to design constant-time-maintainable database schemes", acknowledgement = ack-nhfb, generalterms = "Design; Management; Theory; Verification", keywords = "design; management; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Sacca:1987:MCM, author = "Domenico Sacca and Carlo Zaniolo", title = "Magic counting methods", crossref = "Dayal:1987:PAC", pages = "49--59", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p49-sacca/p49-sacca.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p49-sacca/", abstract = "{\em The problem considered is that of implementing recursive queries, expressed in a logic-based language, by efficient fixpoint computations. In particular, the situation is studied where the initial bindings in the recursive predicate can be used to restrict the search space and ensure safety of execution. Two key techniques previously proposed to solve this problem are (i) the highly efficient counting method, and (ii) the magic set method which is safe in a wider range of situations than (i). In this paper, we present a family of methods, called the magic counting methods, that combines the advantages of (i) and (ii). This is made possible by the similarity of the strategies used by the counting method and the magic set method for propagating the bindings. This paper introduces these new methods, examines their computational complexity, and illustrates the trade-offs between the family members and their superiority with respect to the old methods}.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Information Systems --- Database Management --- Languages (H.2.3); Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}; Theory of Computation --- Mathematical Logic and Formal Languages --- Grammars and Other Rewriting Systems (F.4.2); Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Numerical Algorithms and Problems (F.2.1): {\bf Number-theoretic computations}", } @InProceedings{Gottlob:1987:CCE, author = "G. Gottlob", title = "Computing covers for embedded functional dependencies", crossref = "ACM:1987:PPS", pages = "58--69", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p58-gottlob/p58-gottlob.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p58-gottlob/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p58-gottlob/", abstract = "This paper deals with the problem of computing covers for the functional dependencies embedded in a subset of a given relation schema. We show how this problem can be simplified and present a new and efficient algorithm ``Reduction. By Resolution'' (RBR) for its solution. Though the problem of computing covers for embedded dependencies is inherently exponential, our algorithm behaves polynomially for several classes of inputs. RBR can be used for the solution of some related problems in the theory of database design, such as deciding whether a given database scheme is in Boyce-Codd Normal Form or decomposing a scheme into Boyce-Codd Normal Form.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Management; Theory; Verification", keywords = "algorithms; design; management; theory; verification", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Aly:1987:NDM, author = "Hussien Aly and Z. Meral Ozsoyoglu", title = "Non-deterministic modelling of logical queries in deductive databases", crossref = "Dayal:1987:PAC", pages = "60--72", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p60-aly/p60-aly.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p60-aly/", abstract = "We propose a technique based on Petri Nets formalism to model logic queries in deductive databases. The model is called PNLP (Petri Net model for Logic Programs), and it has a simple formal description and a graphical representation. The PNLP model explicitly represents the relationships between rules and predicates. It is general and flexible enough to demonstrate the flow of control in different algorithms used to evaluate recursive logic queries. In fact the model unifies the level of description of these algorithms, and facilitates identifying similarities and differences between them. The inherent non-determinism in the PNLP model may also be useful in recognizing the parallelism within Horn-clause logic programs. In this paper, the PNLP model is described, and its functionality is demonstrated by modeling several existing algorithms for recursive query evaluation.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Network problems}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}", } @InProceedings{DAtri:1987:DQI, author = "A. D'Atri and P. {Di Felice} and M. Moscarini", title = "Dynamic query interpretation in relational databases", crossref = "ACM:1987:PPS", pages = "70--78", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p70-d_atri/p70-d_atri.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p70-d_atri/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p70-d_atri/", abstract = "A new dynamic approach to the problem of determining the correct interpretation of a logically independent query to a relational database is described. The proposed disambiguating process is based on a simple user-system dialogue that consists in a sequence of decisions about the relevance (or not) of an attribute with respect to the user interpretation", acknowledgement = ack-nhfb, generalterms = "Design; Management; Theory", keywords = "design; management; theory", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Han:1987:HRP, author = "Jiawei Han and Lawrence J. Henschen", title = "Handling redundancy in the processing of recursive database queries", crossref = "Dayal:1987:PAC", pages = "73--81", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p73-han/p73-han.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p73-han/", abstract = "Redundancy may exist in the processing of recursive database queries at four different levels precompilation level, iteration level, tuple processing level and file accessing level. Techniques for reducing redundant work at each level are studied. In the precompilation level, the optimization techniques include removing redundant parts in a rule cluster, simplifying recursive clusters and sharing common subexpressions among rules. At the iteration level, the techniques discussed are the use of frontier relations and the counting method. At the tuple processing level, we use merging and filtering methods to exclude processed drivers from database reaccessing. Finally, at the file accessing level, I/O cost can be further reduced by level relaxation. We conclude that even for complex recursion, redundant database processing can be considerably reduced or eliminated by developing appropriate algorithms.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}", } @InProceedings{Atzeni:1987:NBW, author = "P. Atzeni and M. C. {De Bernardis}", title = "A new basis for the weak instance model", crossref = "ACM:1987:PPS", pages = "79--86", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p79-atzeni/p79-atzeni.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p79-atzeni/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p79-atzeni/", abstract = "A new definition of the weak instance model is presented, which does not consider the missing values as existent though unknown, but just assumes that no information is available about them. It is possible to associate with the new definition logical theories that do not contain universally quantified variables. The new model enjoys various desirable properties of the old weak instance model, with respect to dependency satisfaction, query answering, and associated logical theories.", acknowledgement = ack-nhfb, generalterms = "Design; Management; Theory", keywords = "design; management; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models.", } @InProceedings{Daniels:1987:DLT, author = "Dean S. Daniels and Alfred Z. Spector and Dean S. Thompson", title = "Distributed logging for transaction processing", crossref = "Dayal:1987:PAC", pages = "82--96", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p82-daniels/p82-daniels.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p82-daniels/", abstract = "Increased interest in using workstations and small processors for distributed transaction processing raises the question of how to implement the logs needed for transaction recovery. Although logs can be implemented with data written to duplexed disks on each processing node, this paper argues there are advantages if log data is written to multiple {\em log server\/} nodes. A simple analysis of expected logging loads leads to the conclusion that a high performance, microprocessor based processing node can support a log server if it uses efficient communication protocols and low latency, non volatile storage to buffer log data. The buffer is needed to reduce the processing time per log record and to increase throughput to the logging disk. An interface to the log servers using simple, robust, and efficient protocols is presented. Also described are the disk data structures that the log servers use. This paper concludes with a brief discussion of remaining design issues, the status of a prototype implementation, and plans for its completion.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4); Information Systems --- Database Management --- Database Administration (H.2.7): {\bf Logging and recovery}", } @InProceedings{Malvestuto:1987:AQC, author = "F. M. Malvestuto", title = "Answering queries in categorical databases", crossref = "ACM:1987:PPS", pages = "87--96", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p87-malvestuto/p87-malvestuto.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p87-malvestuto/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p87-malvestuto/", abstract = "A compatible categorical data base can be viewed as a single (contingency) table by taking the {\em maximum-entropy\/} extension of the component tables. Such a view, here called {\em universal table model,\/} is needed to answer a user who wishes ``cross-classified'' categorical data, that is, categorical data resulting from the combination of the information contents of two or more base tables. In order to implement a {\em universal table interface\/} we make use of a query-optimization procedure, which is able to generate an appropriate answer both in the case that the asked data are present in the data base and in the case that they are not and, then, have to be estimated", acknowledgement = ack-nhfb, generalterms = "Design; Management; Theory; Verification", keywords = "design; management; theory; verification", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous.", } @InProceedings{Herman:1987:DAV, author = "Gary Herman and K. C. Lee and Abel Weinrib", title = "The datacycle architecture for very high throughput database systems", crossref = "Dayal:1987:PAC", pages = "97--103", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p97-herman/p97-herman.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p97-herman/", abstract = "{\em The evolutionary trend toward a database-driven public communications network has motivated research into database architectures capable of executing thousands of transactions per second. In this paper we introduce the Datacycle architecture, an attempt to exploit the enormous transmission bandwidth of optical systems to permit the implementation of high throughput multiprocessor database systems. The architecture has the potential for unlimited query throughput, simplified data management, rapid execution of complex queries, and efficient concurrency control. We describe the logical operation of the architecture and discuss implementation issues in the context of a prototype system currently under construction}.", acknowledgement = ack-nhfb, generalterms = "Design; Management", subject = "Information Systems --- Database Management --- Systems (H.2.4); Computer Systems Organization --- Computer-Communication Networks --- Network Architecture and Design (C.2.1): {\bf Network communications}; Computer Systems Organization --- Computer-Communication Networks --- Distributed Systems (C.2.4): {\bf Network operating systems}; Information Systems --- Database Management --- General (H.2.0)", } @InProceedings{Fekete:1987:NTR, author = "A. Fekete and N. Lynch and M. Merrit and W. Weihl", title = "Nested transactions and read-write locking", crossref = "ACM:1987:PPS", pages = "97--111", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p97-fekete/p97-fekete.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p97-fekete/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p97-fekete/", acknowledgement = ack-nhfb, keywords = "algorithms; design; management; verification", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing.", } @InProceedings{Lehman:1987:RAH, author = "Tobin J. Lehman and Michael J. Carey", title = "A recovery algorithm for a high-performance memory-resident database system", crossref = "Dayal:1987:PAC", pages = "104--117", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p104-lehman/p104-lehman.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p104-lehman/", abstract = "With memory prices dropping and memory sizes increasing accordingly, a number of researchers are addressing the problem of designing high-performance database systems for managing memory-resident data. In this paper we address the recovery problem in the context of such a system. We argue that existing database recovery schemes fall short of meeting the requirements of such a system, and we present a new recovery mechanism which is designed to overcome their shortcomings. The proposed mechanism takes advantage of a few megabytes of reliable memory in order to organize recovery information on a per ``object'' basis. As a result, it is able to amortize the cost of checkpoints over a controllable number of updates, and it is also able to separate post-crash recovery into two phases--high-speed recovery of data which is needed immediately by transactions, and background recovery of the remaining portions of the database. A simple performance analysis is undertaken, and the results suggest our mechanism should perform well in a high-performance, memory-resident database environment.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance", subject = "Information Systems --- Database Management --- Physical Design (H.2.2); Computer Systems Organization --- Performance of Systems (C.4); Information Systems --- Database Management --- Systems (H.2.4)", } @InProceedings{Segall:1987:TCM, author = "A. Segall and O. Wolfson", title = "Transaction commitment at minimal communication cost", crossref = "ACM:1987:PPS", pages = "112--118", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p112-segall/p112-segall.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p112-segall/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p112-segall/", abstract = "We consider the communication protocol for transaction commitment in a distributed database. Specifically, the connection between the structure of communication among the participating sites, and the communication network topology is investigated. In order to do so, the cost of transaction commitment is defined as the number of network hops that messages of the protocol must traverse. We establish the necessary cost for transaction commitment, and show that it is also sufficient. A simple distributed algorithm is presented to prove sufficiency. Our algorithm is also time-efficient, and in order to prove that we show that the timing of our algorithm is optimal within a natural class of commit-protocols.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Management; Standardization; Theory; Verification", keywords = "algorithms; design; management; standardization; theory; verification", subject = "Computer Systems Organization --- Computer-Communication Networks --- Network Protocols (C.2.2); Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Trees}", } @InProceedings{Nixon:1987:ICS, author = "Brian Nixon and Lawrence Chung and John Mylopoulos and David Lauzon and Alex Borgida and M. Stanley", title = "Implementation of a compiler for a semantic data model: {Experiences} with taxis", crossref = "Dayal:1987:PAC", pages = "118--131", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p118-nixon/p118-nixon.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p118-nixon/", abstract = "The features of a compiler for the Taxis design language are described and discussed. Taxis offers an entity-based framework for designing interactive information systems and supports generalisation, classification and aggregation as abstraction mechanisms. Its features include multiple inheritance of attributes, isA hierarchies of transactions, metaclasses, typed attributes, a procedural exception-handling mechanism and an iteration construct based on the abstraction mechanisms supported Developing a compiler for the language involved dealing with the problems of efficiently representing and accessing a large collection of entities, performing (static) type checking and representing isA hierarchies of transactions.", acknowledgement = ack-nhfb, generalterms = "Languages; Performance; Theory", subject = "Software --- Programming Languages --- Processors (D.3.4): {\bf Compilers}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Classifications (D.3.2): {\bf TAXIS}", } @InProceedings{Wang:1987:PAM, author = "C. P. Wang and V. O. K. Li", title = "The precedence-assignment model for distributed databases concurrency control algorithms", crossref = "ACM:1987:PPS", pages = "119--128", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p119-wang/p119-wang.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p119-wang/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p119-wang/", abstract = "We have developed a unified model, called the precedence-assignment model (PAM), of concurrency control algorithms in distributed database. It is shown that two-phase locking timestamp-ordering and other existing concurrency control algorithms may be modeled by PAM. We have also developed a new concurrency control algorithm under the PAM modeling framework, which is free from deadlocks and transaction restarts. Finally, a unified concurrency control subsystem for precedence-assignment algorithms is developed. By using this subsystem, different transactions may be executed under different concurrency control algorithms simultaneously.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Management; Theory; Verification", keywords = "algorithms; design; management; theory; verification", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}", } @InProceedings{Hadzilacos:1987:KTA, author = "V. Hadzilacos", title = "A knowledge-theoretic analysis of atomic commitment protocols", crossref = "ACM:1987:PPS", pages = "129--134", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p129-hadzilacos/p129-hadzilacos.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p129-hadzilacos/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p129-hadzilacos/", acknowledgement = ack-nhfb, keywords = "algorithms; management; standardization; theory; verification", subject = "{\bf C.2.2} Computer Systems Organization, COMPUTER-COMMUNICATION NETWORKS, Network Protocols. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Distributed databases. {\bf G.m} Mathematics of Computing, MISCELLANEOUS.", } @InProceedings{Lyngbaek:1987:MSD, author = "Peter Lyngbaek and Victor Vianu", title = "Mapping a semantic database model to the relational model", crossref = "Dayal:1987:PAC", pages = "132--142", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p132-lyngbaek/p132-lyngbaek.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p132-lyngbaek/", abstract = "The connection between semantic database models and the relational model is formally investigated using the Iris Data Model, which has been implemented using relational database techniques. The results focus on properties of relational schemas that are translations of Iris schemas. Two new types of constraints, cross-product constraints and multiplicity constraints are introduced to characterize the relational translations of Iris schemas. The connection established between Iris and relational schemas also yields new, unexpected information about Iris schemas. In particular, a notion of equivalence of Iris schemas is defined using their relational translations, and a result is obtained on simplifying the type structure of Iris schemas.", acknowledgement = ack-nhfb, generalterms = "Design; Theory", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Software Engineering --- Design Tools and Techniques (D.2.2): {\bf IRIS}", } @InProceedings{Minker:1987:PDD, author = "J. Minker", title = "Perspectives in deductive databases {(Abstract only)}", crossref = "ACM:1987:PPS", pages = "135--136 (or 135--135??)", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p135-minker/p135-minker.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p135-minker/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p135-minker/", abstract = "I will discuss my experiences, some of the work that I have done and related work that influenced me, concerning deductive databases over the last 30 years. It will be convenient to divide this time period into roughly three equal parts, 1957 - 1968, 1969 - 1978, 1979 - present. For the first portion I will describe how my interest started in deductive databases in 1957, at a time when not even the field of databases existed I will describe work in the beginning years, leading to the start of deductive databases in about 1968 with the work of Cordell Green and Bertram Raphael. \par The second period saw a great deal of work in theorem proving as well as the introduction of logic programming. The existence and importance of deductive databases as a formal and viable discipline received its impetus at a workshop held in Toulouse, France, in 1977, which culminated in the book, Logic and Data Bases. The relationship of deductive databases and logic programming was recognized at that time. During the third and most recent period we have seen formal theories of databases come about as an outgrowth of that work, and the recognition that artificial intelligence and deductive databases are closely related, at least through the so-called expert database systems. I expect that the relationships between techniques from formal logic, databases, logic programming, and artificial intelligence will continue to be explored and the field of deductive databases will become a more prominent area of computer science in coming years.", acknowledgement = ack-nhfb, generalterms = "Management", keywords = "management", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf I.2.1} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Applications and Expert Systems.", } @InProceedings{Apt:1987:MSD, author = "K. Apt and J. M. Pugin", title = "Maintenance of stratified databases viewed as a belief revision system", crossref = "ACM:1987:PPS", pages = "136--145", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p136-apt/p136-apt.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p136-apt/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p136-apt/", abstract = "We study here declarative and dynamic aspects of non-monotonic reasoning in the context of deductive databases. More precisely, we consider here maintenance of a special class of indefinite deductive databases, called stratified databases, introduced in Apt, Blair and Walker [ABW] and Van Gelder [VG] in which recursion ``through'' negation is disallowed. \par A stratified database has a natural model associated with it which is selected as its intended meaning. The maintenance problem for these databases is complicated because insertions can lead to deletions and vice versa. \par To solve this problem we make use of the ideas present in the works of Doyle [D] and de Kleer [dK] on belief revision systems. We offer here a number of solutions which differ in the amount of static and dynamic information used and the form of support introduced. We also discuss the implementation issues and the trade-offs involved.", acknowledgement = ack-nhfb, generalterms = "Design; Management; Theory", keywords = "design; management; theory", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Nonmonotonic reasoning and belief revision.", } @InProceedings{Roth:1987:DRD, author = "Mark A. Roth and Henry F. Korth", title = "The design of {$1$NF} relational databases into nested normal form", crossref = "Dayal:1987:PAC", pages = "143--159", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p143-roth/p143-roth.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p143-roth/", abstract = "We develop new algorithms for the design of non first normal form relational databases that are in nested normal form. Previously, a set of given multivalued dependencies and those multivalued dependencies implied by given functional dependencies were used to obtain a nested normal form decomposition of a scheme. This method ignored the semantic distinction between functional and multivalued dependencies and utilized only full multivalued dependencies in the design process. We propose new algorithms which take advantage of this distinction, and use embedded multivalued dependencies to enhance the decomposition. This results in further elimination of redundancy due to functional dependencies in nested normal form designs.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Normal forms}", } @InProceedings{Hegner:1987:SIP, author = "S. Hegner", title = "Specification and implementation of programs for updating incomplete information databases", crossref = "ACM:1987:PPS", pages = "146--158", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p146-hegner/p146-hegner.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p146-hegner/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p146-hegner/", abstract = "The problem of updating incomplete information databases is examined as a programming problem. From this point of view formal denotational semantics are developed for two applicative programming languages, BLU and HLU. BLU is a very simple language with only five primitives, and is designed primarily as a tool for the implementation of higher level languages. The semantics of BLU are formally developed at two levels possible worlds and clausal and the latter is shown to be a correct implementation of the former. HLU is a user level update language. It is defined entirely in terms of BLU, and so immediately inherits its semantic definition from that language. This demonstrates a level of completeness for BLU as a level of primitives for update language implementation. The necessity of a particular BLU primitive, {\em masking}, suggests that there is a high degree of inherent complexity in updating logical databases.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages; Management; Theory", keywords = "algorithms; languages; management; theory", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf D.3.2} Software, PROGRAMMING LANGUAGES, Language Classifications. {\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages, Denotational semantics. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Biliris:1987:OSL, author = "A. Biliris", title = "Operation specific locking in {B}-trees", crossref = "ACM:1987:PPS", pages = "159--169", month = mar, year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "Database/Wiederhold.bib; http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p159-biliris/p159-biliris.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p159-biliris/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p159-biliris/", abstract = "B-trees have been used as an access and for both primary and secondary indexing for quite some time. This paper presents a deadlock free locking mechanism in which different processes make use of different lock types in order to reach the leaf nodes. The compatibility relations among locks on a node, do not exclusively depend on their type, but also on the node status and the number and kind of processes acting currently on the node. As a result, a number of insertion or deletion processes can operate concurrently on a node. The paper presents an appropriate recovery strategy in case of failure, and discusses the protocol modifications that are required so it can be used in other similar structures such as B + -trees, compressed B-trees, and R-trees for spatial searching.", acknowledgement = ack-nhfb, generalterms = "Design; Management; Standardization; Theory", keywords = "design; management; standardization; theory", subject = "{\bf H.2.2} Information Systems, DATABASE MANAGEMENT, Physical Design, Deadlock avoidance. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Trees. {\bf I.2.8} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Problem Solving, Control Methods, and Search, Graph and tree search strategies.", } @InProceedings{Graefe:1987:EOG, author = "Goetz Graefe and David J. DeWitt", title = "The {EXODUS} optimizer generator", crossref = "Dayal:1987:PAC", pages = "160--172", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p160-graefe/p160-graefe.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p160-graefe/", abstract = "This paper presents the design and an initial performance evaluation of the query optimizer generator designed for the EXODUS extensible database system. Algebraic transformation rules are translated into an executable query optimizer, which transforms query trees and selects methods for executing operations according to cost functions associated with the methods. The search strategy avoids exhaustive search and it modifies itself to take advantage of past experience. Computational results show that an optimizer generated for a relational system produces access plans almost as good as those produced by exhaustive search, with the search time cut to a small fraction.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance", subject = "Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Classifications (D.3.2): {\bf EXODUS}", } @InProceedings{Nurmi:1987:CCD, author = "O. Nurmi and E. Soisalon-Soininen and D. Wood", title = "Concurrency Control in Database Structures with Relaxed Balance", crossref = "ACM:1987:PPS", pages = "170--176", month = mar, year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "Database/Wiederhold.bib; http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p170-nurmi/p170-nurmi.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p170-nurmi/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p170-nurmi/", abstract = "We consider the separation of rebalancing from updates in several database structures, such as B-trees for external and AVL-trees for internal structures. We show how this separation can be implemented such that rebalancing is performed by local background processes. Our solution implies that even simple locking schemes (without additional links and copies of certain nodes) for concurrency control are efficient in the sense that at any time only a small constant number of nodes must be locked.", acknowledgement = ack-nhfb, annote = "temporary layer block is inserted in Btree so split does not propagate up. Cleanup as in Sagiv,Y. 86. Can solve variable-length entry problem.", generalterms = "Design; Management; Theory", keywords = "design; management; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Concurrency. {\bf I.2.8} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Problem Solving, Control Methods, and Search, Graph and tree search strategies. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Trees.", } @InProceedings{Freytag:1987:RBV, author = "Johann Christoph Freytag", title = "A rule-based view of query optimization", crossref = "Dayal:1987:PAC", pages = "173--180", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p173-freytag/p173-freytag.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p173-freytag/", abstract = "The query optimizer is an important system component of a relational database management system (DBMS). It is the responsibility of this component to translate the user-submitted query - usually written in a non-procedural language - into an efficient query evaluation plan (QEP) which is then executed against the database. The research literature describes a wide variety of optimization strategies for different query languages and implementation environments. However, very little is known about how to design and structure the query optimization component to implement these strategies. \par This paper proposes a first step towards the design of a {\em modular query optimizer}. We describe its operations by {\em transformation rules\/} which generate different QEPs from initial query specifications. As we distinguish different aspects of the query optimization process, our hope is that the approach taken in this paper will contribute to the more general goal of a modular query optimizer as part of an extensible database management system.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4); Theory of Computation --- Mathematical Logic and Formal Languages --- Grammars and Other Rewriting Systems (F.4.2)", } @InProceedings{Sun:1987:PRM, author = "R. Sun and G. Thomas", title = "Performance results on multiversion timestamp concurrency control with predeclared writesets", crossref = "ACM:1987:PPS", pages = "177--184", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p177-sun/p177-sun.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p177-sun/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p177-sun/", acknowledgement = ack-nhfb, keywords = "management; measurement; performance; standardization", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Concurrency. {\bf C.4} Computer Systems Organization, PERFORMANCE OF SYSTEMS, Modeling techniques.", } @InProceedings{Shenoy:1987:SSQ, author = "Sreekumar T. Shenoy and Z. Meral Ozsoyoglu", title = "A system for semantic query optimization", crossref = "Dayal:1987:PAC", pages = "181--195", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p181-shenoy/p181-shenoy.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p181-shenoy/", abstract = "This paper describes a scheme to utilize semantic integrity constraints in optimizing a user specified query. The scheme uses a graph theoretic approach to identify redundant join clauses and redundant restriction clauses specified in a user query. An algorithm is suggested to eliminate such redundant joins and avoid unnecessary restrictions. In addition to these eliminations, the algorithm aims to introduce as many restrictions on indexed attributes as possible, thus yielding an equivalent, but potentially more profitable, form of the original query.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages; Performance", subject = "Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Dechter:1987:DAR, author = "R. Dechter", title = "Decomposing an {$N$-ary} Relation into a Tree of Binary Relations", crossref = "ACM:1987:PPS", pages = "185--189", month = mar, year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "Database/Wiederhold.bib; http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.acm.org/pubs/toc/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p185-dechter/p185-dechter.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p185-dechter/", abstract = "We present an efficient algorithm for decomposing an $n$-ary relation into a tree of binary relations, and provide an efficient test for checking whether or not the tree formed represents the relation. If there exists a tree-decomposition, the algorithm is guaranteed to find one, otherwise, the tree generated will fail the test, then indicating that no tree decomposition exist. The unique features of the algorithm presented in this paper, is that it does not a priori assume any dependencies in the initial relation, rather it derives such dependencies from the bare relation instance.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Management; Theory; Verification", keywords = "algorithms; management; theory; verification", subject = "{\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory, Trees. {\bf I.2.8} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Problem Solving, Control Methods, and Search, Graph and tree search strategies.", } @InProceedings{Delgrande:1987:FLA, author = "J. P. Delgrande", title = "Formal limits on the automatic generation and maintenance of integrity constraints", crossref = "ACM:1987:PPS", pages = "190--196", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p190-delgrande/p190-delgrande.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p190-delgrande/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p190-delgrande/", abstract = "A formal approach to the automatic generation and maintenance of integrity constraints in relational databases is presented. It is assumed that some portion of the database extension is known and that constraints are to be formed on the basis of this portion. Since this portion may be updated or new relations added to the database the set of hypothesised constraints may require occasional revision. The goal is this paper is to characterise those constraints that may potentially be formed on the basis of a part of the extension. Formal systems are derived by means of which the set of constraints that can be formed is precisely specified. A procedure is derived for restoring the consistency of a set of constraints after conflicting tuples are encountered. It is shown that the set of constraints to which the procedure may be applied corresponds with minor limitations to the sentences of relational algebra.", acknowledgement = ack-nhfb, generalterms = "Management; Theory; Verification", keywords = "management; theory; verification", subject = "{\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General, Security, integrity, and protection**. {\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf G.2.m} Mathematics of Computing, DISCRETE MATHEMATICS, Miscellaneous. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Schema and subschema.", } @InProceedings{Paul:1987:AID, author = "H. B. Paul and H. J. Schek and M. H. Scholl", title = "Architecture and implementation of the {Darmstadt} database kernel system", crossref = "Dayal:1987:PAC", pages = "196--207", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p196-paul/p196-paul.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p196-paul/", abstract = "The multi-layered architecture of the DArmStadt Data Base System (DASDBS) for advanced applications is introduced DASDBS is conceived as a family of application-specific database systems on top of a common database kernel system. The main design problem considered here is, What features are common enough to be integrated into the kernel and what features are rather application-specific? Kernel features must be simple enough to be efficiently implemented and to serve a broad class of clients, yet powerful enough to form a convenient basis for application-oriented layers. Our kernel provides mechanisms to efficiently store hierarchically structured complex objects, and offers operations which are set-oriented and can be processed in a single scan through the objects. To achieve high concurrency in a layered system, a multi-level transaction methodology is applied. First experiences with our current implementation and some lessons we have learned from it are reported.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf DASDBS}; Software --- Software Engineering --- Distribution, Maintenance, and Enhancement (D.2.7): {\bf Extensibility**}", } @InProceedings{Imielinski:1987:RKD, author = "T. Imielinski", title = "Relative knowledge in a distributed database", crossref = "ACM:1987:PPS", pages = "197--209", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p197-imielinski/p197-imielinski.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p197-imielinski/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p197-imielinski/", abstract = "Let DB be a database and let u 1, , u m be a collection of users each having at his or her disposal a query sublanguage L u 1 generated by some view predicate Each of these users knows only as much as he can learn from the database using his or her query sublanguage. Such a knowledge is called {\em relative knowledge\/} in the paper and its various properties including the model and proof theory are investigated. The applications of relative knowledge in the database security and integrity are also discussed.", acknowledgement = ack-nhfb, generalterms = "Languages; Management; Theory; Verification", keywords = "languages; management; theory; verification", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Distributed databases. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages.", } @InProceedings{Richardson:1987:PCD, author = "Joel E. Richardson and Michael J. Carey", title = "Programming constructs for database system implementation in {EXODUS}", crossref = "Dayal:1987:PAC", pages = "208--219", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p208-richardson/p208-richardson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p208-richardson/", abstract = "The goal of the EXODUS extensible DBMS project is to enable the rapid development of a wide spectrum of high-performance, application-specific database systems EXODUS provides certain kernel facilities for use by all applications and a set of tools to aid the database implementor (DBI) in generating new database system software. Some of the DBI's work is supported by EXODUS tools which generate database components from a specification. However, components such as new abstract data types, access methods, and database operations must be explicitly coded by the DBI. This paper analyzes the major programming problems faced by the DBI, describing the collection of programming language constructs that EXODUS provides for simplifying the DBI's task. These constructs have been embedded in the E programming language, an extension of C++ designed specifically for implementing DBMS software.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Performance", subject = "Software --- Programming Languages --- Language Classifications (D.3.2): {\bf EXODUS}; Information Systems --- Database Management --- Systems (H.2.4); Software --- Programming Languages --- Language Constructs and Features (D.3.3); Software --- Software Engineering --- Distribution, Maintenance, and Enhancement (D.2.7): {\bf Extensibility**}", } @InProceedings{Afrati:1987:PCS, author = "F. Afrati and C. Papadimitriou", title = "The Parallel Complexity of Simple Chain Queries", crossref = "ACM:1987:PPS", pages = "210--213", month = mar, year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "Database/Wiederhold.bib; http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p210-afrati/p210-afrati.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p210-afrati/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p210-afrati/", acknowledgement = ack-nhfb, keywords = "languages; management; theory; verification", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.1.2} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Modes of Computation, Parallelism and concurrency. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog.", } @InProceedings{Beeri:1987:BPS, author = "C. Beeri and P. Kanellakis and F. Bancilhon and R. Ramakrishnan", title = "Bounds on the propagation of selection into logic programs", crossref = "ACM:1987:PPS", pages = "214--226", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p214-beeri/p214-beeri.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p214-beeri/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p214-beeri/", abstract = "We consider the problem of propagating selections (i.e., bindings of variables) into logic programs. In particular, we study the class of binary chain programs and define selection propagation as the task of finding an equivalent program containing only unary derived predicates. We associate a context free grammar {\em L(H)\/} with every binary chain program {\em H}. We show that, given {$H$} propagating a selection involving some constant is possible iff {\em L(H)\/} is regular, and therefore undecidable. We also show that propagating a selection of the form {\em p(X,X)\/} is possible iff {\em L(H)\/} is finite, and therefore decidable. We demonstrate the connection of these two cases, respectively, with the weak monadic second order theory of one successor and with monadic generalized spectra. We further clarify the analogy between chain programs and languages from the point of view of program equivalence and selection propagation heuristics.", acknowledgement = ack-nhfb, generalterms = "Languages; Management; Theory; Verification", keywords = "languages; management; theory; verification", subject = "{\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Logic programming. {\bf F.4.2} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Grammars and Other Rewriting Systems, Grammar types. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages.", } @InProceedings{Lindsay:1987:DME, author = "Bruce Lindsay and John McPherson and Hamid Pirahesh", title = "A data management extension architecture", crossref = "Dayal:1987:PAC", pages = "220--226", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p220-lindsay/p220-lindsay.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p220-lindsay/", abstract = "A database management system architecture is described that facilitates the implementation of data management extensions for relational database systems. The architecture defines two classes of data management extensions alternative ways of storing relations called relation ``storage methods'', and access paths, integrity constraints, or triggers which are ``attachments'' to relations. Generic sets of operations are defined for storage methods and attachments, and these operations must be provided in order to add a new storage method or attachment type to the system. The data management extension architecture also provides common services for coordination of storage method and attachment execution. This article describes the data management extension architecture along with some implementation issues and techniques.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Software Engineering --- Distribution, Maintenance, and Enhancement (D.2.7): {\bf Extensibility**}", } @InProceedings{Naughton:1987:DCB, author = "J. F. Naughton and Y. Sagiv", title = "A decidable class of bounded recursions", crossref = "ACM:1987:PPS", pages = "227--236", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p227-naughton/p227-naughton.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p227-naughton/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p227-naughton/", abstract = "Detecting bounded recursions is a powerful optimization technique for recursions database query languages as bounded recursions can be replaced by equivalent nonrecursive definitions. The problem is of theoretical interest because by varying the class of recursions considered one can generate instances that vary from linearly decidable to NP-hard to undecidable. In this paper we review and clarify the existing definitions of boundedness. We then specify a sample criterion that guarantees that the condition in Vaughton [7] is necessary and sufficient for boundedness. The programs satisfying this criterion subsume and extend previously known decidable classes of bounded linear recursions.", acknowledgement = ack-nhfb, generalterms = "Languages; Management; Theory; Verification", keywords = "languages; management; theory; verification", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf F.3.3} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Studies of Program Constructs, Program and recursion schemes. {\bf G.2.m} Mathematics of Computing, DISCRETE MATHEMATICS, Miscellaneous.", } @InProceedings{Jajodia:1987:DV, author = "Sushil Jajodia and David Mutchler", title = "Dynamic voting", crossref = "Dayal:1987:PAC", pages = "227--238", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p227-jajodia/p227-jajodia.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p227-jajodia/", abstract = "In a voting-based algorithm, a replicated file can be updated in a partition if it contains a majority of copies. In this paper, we propose an extension of this scheme which permits a file to be updated in a partition provided it contains a majority of up-to-date copies. Our scheme not only preserves mutual consistency of the replicated file, but provides improvement in its availability as well. We develop a stochastic model which gives insight into the improvements afforded by our scheme over the voting scheme.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Software --- Operating Systems --- File Systems Management (D.4.3): {\bf Maintenance**}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}", } @InProceedings{Shmueli:1987:DEA, author = "O. Shmueli", title = "Decidability and expressiveness aspects of logic queries", crossref = "ACM:1987:PPS", pages = "237--249", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p237-shmueli/p237-shmueli.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p237-shmueli/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p237-shmueli/", abstract = "This paper addresses some basic problems regarding logic programming based queries over relational databases. We re-examine the query classes {$H$} and {\em YE\/} + defined by Chandra and Harel [2] We define {$H$} + and {\em YE\/} ++ which differ from {$H$} and {\em YE\/} + in that the use of equality (=) and inequality () is prohibited. We show that {$H$} + is more expressive than {\em YE\/} ++ and that any {$H$} + program can be transformed into an equivalent {$H$} + program containing a single recursive predicate without using the equality or inequality operators. As a corollary we obtain a fixpoint formula characterization of {$H$} + queries. \par We consider the problems of determining containment, equivalence, and satisfiability of logic based queries. The containment and equivalence problems addressed here extend the work of Aho, Sagiv and Ullman on relational queries [1] and Papadimitrious on Prolog [10]. As corollaries we show that determining safety and literal redundancy are both undecidable problems.", acknowledgement = ack-nhfb, generalterms = "Languages; Management; Theory; Verification", keywords = "languages; management; theory; verification", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Logic programming.", } @InProceedings{Haerder:1987:CTR, author = "Theo Haerder and Kurt Rothermel", title = "Concepts for transaction recovery in nested transactions", crossref = "Dayal:1987:PAC", pages = "239--248", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p239-haerder/p239-haerder.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p239-haerder/", abstract = "The concept of nested transactions offers more decomposable execution units and finer grained control over recovery and concurrency as compared to `flat' transactions. To exploit these advantages, especially transaction recovery has to be refined and adjusted to the requirements of the control structure. \par In this paper, we investigate transaction recovery for nested transactions. Therefore, a model for nested transaction is introduced allowing for synchronous and asynchronous transaction invocation as well as single call and conversational interfaces. For the resulting four parameter combinations, the properties and dependencies of transaction recovery are explored if a transaction is `unit of recovery' and if savepoints within transactions are used to gain finer recovery units.", acknowledgement = ack-nhfb, generalterms = "Performance; Security; Theory", subject = "Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Recovery and restart}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}", } @InProceedings{Garcia-Molina:1987:S, author = "Hector Garcia-Molina and Kenneth Salem", title = "Sagas", crossref = "Dayal:1987:PAC", pages = "249--259", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p249-garcia-molina/p249-garcia-molina.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p249-garcia-molina/", abstract = "Long lived transactions (LLTs) hold on to database resources for relatively long periods of time, significantly delaying the termination of shorter and more common transactions. To alleviate these problems we propose the notion of a saga. A LLT is a saga if it can be written as a sequence of transactions that can be interleaved with other transactions. The database management system guarantees that either all the transactions in a saga are successfully completed or compensating transactions are run to amend a partial execution. Both the concept of saga and its implementation are relatively simple, but they have the potential to improve performance significantly. We analyze the various implementation issues related to sagas, including how they can be run on an existing system that does not directly support them. We also discuss techniques for database and LLT design that make it feasible to break up LLTs into sagas.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Physical Design (H.2.2)", } @InProceedings{Selinger:1987:CEI, author = "P. Selinger", title = "Chickens and eggs --- the interrelationship of systems and theory", crossref = "ACM:1987:PPS", pages = "250--253", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p250-selinger/p250-selinger.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p250-selinger/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p250-selinger/", abstract = "This paper describes a personal perspective of the kinds of contributions that systems research and theoretical research make to one another particularly in the database area. Examples of each kind of contribution are given, and then several case studies from the author a personal experience are presented. The case studies illustrate database systems research where theoretical work contributed to systems results and vice versa. Areas of database systems which need more contributions from the theoretical community will also be presented.", acknowledgement = ack-nhfb, generalterms = "Management; Theory", keywords = "management; theory", subject = "{\bf H.1.1} Information Systems, MODELS AND PRINCIPLES, Systems and Information Theory.", } @InProceedings{Karabeg:1987:ASR, author = "A. Karabeg and D. Karabeg and K. Papakonstantinou and V. Vianu", title = "Axiomatization and simplification rules for relational transactions", crossref = "ACM:1987:PPS", pages = "254--259", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p254-karabeg/p254-karabeg.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p254-karabeg/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p254-karabeg/", acknowledgement = ack-nhfb, keywords = "management; theory; verification", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing. {\bf G.2.m} Mathematics of Computing, DISCRETE MATHEMATICS, Miscellaneous.", } @InProceedings{Abiteboul:1987:TLC, author = "S. Abiteboul and V. Vianu", title = "A translation language complete for database update and specification", crossref = "ACM:1987:PPS", pages = "260--268", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p260-abiteboul/p260-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p260-abiteboul/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p260-abiteboul/", acknowledgement = ack-nhfb, keywords = "design; languages; management", subject = "{\bf D.3.2} Software, PROGRAMMING LANGUAGES, Language Classifications, TL.", } @InProceedings{Freeston:1987:BFN, author = "Michael Freeston", title = "The {BANG} file: a new kind of grid file", crossref = "Dayal:1987:PAC", pages = "260--269", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p260-freeston/p260-freeston.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p260-freeston/", abstract = "A new multi-dimensional file structure has been developed in the course of a project to devise ways of improving the support for interactive queries to database and knowledge bases. Christened the `BANG' file - a Balanced And Nested Grid - the new structure is of the `grid file' type, but is fundamentally different from previous grid file designs in that it does not share their common underlying properties. It has a tree-structured directory which has the self-balancing property of a B-tree and which, in contrast to previous designs, always expands at the same rate as the data, whatever the form of the data distribution. Its partitioning strategy both accurately reflects the clustering of points in the data space, and is flexible enough to adapt gracefully to changes in the distribution.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Data --- Files (E.5): {\bf Organization/structure}; Data --- Data Structures (E.1): {\bf Trees}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Beeri:1987:PM, author = "C. Beeri and R. Ramakrishnan", title = "On the power of magic", crossref = "ACM:1987:PPS", pages = "269--284", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p269-beeri/p269-beeri.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p269-beeri/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p269-beeri/", abstract = "This paper considers the efficient evaluation of recursive queries expressed using Horn Clauses. We define {\em sideways information passing\/} formally and show how a query evaluation algorithm may be defined in terms of sideways information passing and control. We then consider a class of information passing strategies which suffices to describe most query evaluation algorithms in the database literature, and show that these strategies may always be implemented by rewriting a given program and evaluating the rewritten program bottom-up. We describe in detail several algorithms for rewriting a program. These algorithms generalize the Counting and Magic Sets algorithms to work with arbitrary programs. Safety and optimality of the algorithms are also considered.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Management; Performance; Theory; Verification", keywords = "algorithms; management; performance; theory; verification", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.3.3} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Studies of Program Constructs, Program and recursion schemes. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming.", } @InProceedings{Nelson:1987:PAH, author = "Randal C. Nelson and Hanan Samet", title = "A population analysis for hierarchical data structures", crossref = "Dayal:1987:PAC", pages = "270--277", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p270-nelson/p270-nelson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p270-nelson/", abstract = "A new method termed population analysis is presented for approximating the distribution of node occupancies in hierarchical data structures which store a variable number of geometric data items per node. The basic idea is to describe a dynamic data structure as a set of populations which are permitted to transform into one another according to certain rules. The transformation rules are used to obtain a set of equations describing a population distribution which is stable under insertion of additional information into the structure. These equations can then be solved, either analytically or numerically, to obtain the population distribution. Hierarchical data structures are modeled by letting each population represent the nodes of a given occupancy. A detailed analysis of quadtree data structures for storing point data is presented, and the results are compared to experimental data. Two phenomena referred to as {\em aging\/} and {\em phasing\/} are defined and shown to account for the differences between the experimental results and those predicted by the model. The population technique is compared with statistical methods of analyzing similar data structures.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Data --- Data Structures (E.1): {\bf Trees}; Data --- Files (E.5): {\bf Organization/structure}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Sellis:1987:ESP, author = "Timos K. Sellis", title = "Efficiently supporting procedures in relational database systems", crossref = "Dayal:1987:PAC", pages = "278--291", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p278-sellis/p278-sellis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p278-sellis/", abstract = "We examine an extended relational database system which supports database procedures as full fledged objects. In particular, we focus on the problems of query processing and efficient support for database procedures. First, a variation to the original INGRES decomposition algorithm is presented. Then, we examine the idea of storing results of previously processed procedures in secondary storage ({\em caching\/}). Using a cache, the cost of processing a query can be reduced by preventing multiple evaluations of the same procedure. Problems associated with cache organizations, such as replacement policies and validation schemes are examined. Another means for reducing the execution cost of queries is indexing. A new indexing scheme for cached results, Partial Indexing, is proposed and analyzed.", acknowledgement = ack-nhfb, subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Grahne:1987:EES, author = "G. Grahne and S. Sippu and E. Soisalon-Soininen", title = "Efficient evaluation for a subset of recursive queries", crossref = "ACM:1987:PPS", pages = "284--293", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p284-grahne/p284-grahne.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p284-grahne/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p284-grahne/", abstract = "Well-known results on graph traversal are used to develop a practical, efficient algorithm for evaluating regularly and linearly recursive queries in databases that contain only binary relations. Transformations are given that reduce a subset of regular and linear queries involving $n$-ary relations ($n^2$) to queries involving only binary relations.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Management; Measurement; Performance; Theory", keywords = "algorithms; management; measurement; performance; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.3.3} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Studies of Program Constructs, Program and recursion schemes. {\bf G.2.m} Mathematics of Computing, DISCRETE MATHEMATICS, Miscellaneous.", xxauthor = "G. Grahne and S. Siu and E. Soisalon-Soininen", } @InProceedings{Hardwick:1987:WRF, author = "Martin Hardwick", title = "Why {ROSE} is fast: {Five} optimizations in the design of an experimental database system for {CAD\slash CAM} applications", crossref = "Dayal:1987:PAC", pages = "292--298", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p292-hardwick/p292-hardwick.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p292-hardwick/", abstract = "ROSE is an experimental database system for CAD/CAM applications that organizes a database into entries and relationships. The data model of ROSE is an extension of the relational model and the data manipulation language is an extension of the relational algebra. Internally, ROSE is organized so that it can use operating system services to implement database system services. In this paper we describe five optimizations that have helped to make ROSE a fast database system for CAD/CAM.", acknowledgement = ack-nhfb, generalterms = "Design; Experimentation; Performance", subject = "Computer Applications --- Computer-Aided Engineering (J.6); Information Systems --- Database Management --- Systems (H.2.4): {\bf ROSE}", } @InProceedings{Marchetti-Spaccamella:1987:WCC, author = "A. Marchetti-Spaccamella and A. Pelaggi and D. Sacca", title = "Worst-case complexity analysis of methods for logic query implementation", crossref = "ACM:1987:PPS", pages = "294--301", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p294-marchetti-spaccamella/p294-marchetti-spaccamella.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p294-marchetti-spaccamella/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p294-marchetti-spaccamella/", acknowledgement = ack-nhfb, keywords = "algorithms; management; theory", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf G.2.m} Mathematics of Computing, DISCRETE MATHEMATICS, Miscellaneous.", } @InProceedings{Kemper:1987:OOS, author = "Alfons Kemper and Peter C. Lockemann and Mechtild Wallrath", title = "An object-oriented system for engineering applications", crossref = "Dayal:1987:PAC", pages = "299--310", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p299-kemper/p299-kemper.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p299-kemper/", abstract = "One of the most promising approaches to database support of engineering applications is the concept of object-oriented database management. Object-orientation is usually approached from either a behavioral or structural viewpoint. The former emphasizes the application-specific manipulation of technical objects while hiding their structural details whereas the latter concentrates on the structural aspects and their efficient implementation. The thesis of the paper is that the two viewpoints may enter into a fruitful symbiosis where a behaviorally object-oriented system is implemented on top of a structurally object-oriented database system, thereby combining ease of use by the engineer with high database system performance. The thesis will be demonstrated in the paper by a user-friendly interface based on user-definable abstract datatypes and its implementation using a prototype for the non-first-normal-form (NF 2) relational model, and will be supported by an engineering example application from off-line robot programming.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computer Applications --- Physical Sciences and Engineering (J.2): {\bf Engineering}; Information Systems --- Database Management --- Systems (H.2.4); Software --- Software Engineering --- Design Tools and Techniques (D.2.2)", } @InProceedings{VanGucht:1987:EPE, author = "D. {Van Gucht}", title = "On the expressive power of the extended relational algebra for the unnormalized relational model", crossref = "ACM:1987:PPS", pages = "302--312", year = "1987", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p302-van_gucht/p302-van_gucht.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p302-van_gucht/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p302-van_gucht/", acknowledgement = ack-nhfb, keywords = "design; management; theory; verification", subject = "{\bf H.2.m} Information Systems, DATABASE MANAGEMENT, Miscellaneous. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design.", } @InProceedings{Banerjee:1987:SIS, author = "Jay Banerjee and Won Kim and Hyoung-Joo Kim and Henry F. Korth", title = "Semantics and implementation of schema evolution in object-oriented databases", crossref = "Dayal:1987:PAC", pages = "311--322", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p311-banerjee/p311-banerjee.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p311-banerjee/", abstract = "Object-oriented programming is well-suited to such data-intensive application domains as CAD/CAM, AI, and OIS (office information systems) with multimedia documents. At MCC we have built a prototype object-oriented database system, called ORION. It adds persistence and sharability to objects created and manipulated in applications implemented in an object-oriented programming environment. One of the important requirements of these applications is schema evolution, that is, the ability to dynamically make a wide variety of changes to the database schema. In this paper, following a brief review of the object-oriented data model that we support in ORION, we establish a framework for supporting schema evolution, define the semantics of schema evolution, and discuss its implementation.", acknowledgement = ack-nhfb, generalterms = "Languages; Performance", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Schema and subschema}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Information Storage and Retrieval --- Systems and Software (H.3.4): {\bf ORION}", } @InProceedings{VanGelder:1987:SCT, author = "A. {Van Gelder} and R. Topor", title = "Safety and correct translation of relational calculus formulas", crossref = "ACM:1987:PPS", pages = "313--327", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p313-van_gelder/p313-van_gelder.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p313-van_gelder/", abstract = "Not all queries in relational calculus can be answered ``sensibly'' once disjunction, negation, and universal quantification are allowed. The class of relational calculus queries, or formulas, that have ``sensible'' answers is called the {\em domain independent\/} class, which is known to be undecidable. Subsequent research has focused on identifying large decidable subclasses of domain independent formulas In this paper we investigate the properties of two such classes the {\em evaluable\/} formulas and the {\em allowed\/} formulas. Although both classes have been defined before, we give simplified definitions, present short proofs of their man properties, and describe a method to incorporate equality. \par Although evaluable queries have sensible answers, it is not straightforward to compute them efficiently or correctly. We introduce {\em relational algebra normal form\/} for formulas from which form the correct translation into relational algebra is trivial. We give algorithms to transform an evaluable formula into an equivalent {\em allowed\/} formula, and from there into relational algebra normal form. Our algorithms avoid use of the so-called {\em Dom\/} relation, consisting of all constants appearing in the database or the query. \par Finally, we describe a restriction under which every domain independent formula is evaluable, and argue that evaluable formulas may be the largest decidable subclass of the domain independent formulas that can be efficiently recognized.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Management; Performance; Theory; Verification", keywords = "algorithms; management; performance; theory; verification", subject = "Information Systems --- Database Management --- Miscellaneous (H.2.m); Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Deduction}", } @InProceedings{Cruz:1987:GQL, author = "Isabel F. Cruz and Alberto O. Mendelzon and Peter T. Wood", title = "A graphical query language supporting recursion", crossref = "Dayal:1987:PAC", pages = "323--330", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p323-cruz/p323-cruz.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p323-cruz/", abstract = "We define a language G for querying data represented as a labeled graph {\em G}. By considering {$G$} as a relation, this graphical query language can be viewed as a relational query language, and its expressive power can be compared to that of other relational query languages. We do not propose G as an alternative to general purpose relational query languages, but rather as a complementary language in which recursive queries are simple to formulate. The user is aided in this formulation by means of a graphical interface. The provision of regular expressions in G allows recursive queries more general than transitive closure to be posed, although the language is not as powerful as those based on function-free Horn clauses. However, we hope to be able to exploit well-known graph algorithms in evaluating recursive queries efficiently, a topic which has received widespread attention recently.", acknowledgement = ack-nhfb, generalterms = "Languages; Theory", subject = "Information Systems --- Database Management --- Languages (H.2.3); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Path and circuit problems}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}", } @InProceedings{Ramakrishnan:1987:SRH, author = "R. Ramakrishnan and F. Bancilhon and A. Silberschatz", title = "Safety of recursive {Horn} clauses with infinite relations", crossref = "ACM:1987:PPS", pages = "328--339", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p328-ramakrishnan/p328-ramakrishnan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p328-ramakrishnan/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p328-ramakrishnan/", abstract = "A database query is said to be {\em safe\/} if its result consists of a finite set of tuples If a query is expressed using a set of pure Horn Clauses, the problem of determining whether it is safe is in general undecidable In this paper, we show that the problem is decidable when terms involving function symbols (including arithmetic) are represented as distinct occurrences of uninterpreted infinite predicates over which certain {\em finiteness dependencies\/} hold. We present a sufficient condition for safety when some {\em monotonicity constraints\/} also hold.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Management; Performance; Theory", keywords = "algorithms; management; performance; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Logic and constraint programming. {\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General, Security, integrity, and protection**.", } @InProceedings{Jagadish:1987:STC, author = "H. V. Jagadish and Rakesh Agrawal and Linda Ness", title = "A study of transitive closure as a recursion mechanism", crossref = "Dayal:1987:PAC", pages = "331--344", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p331-jagadish/p331-jagadish.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p331-jagadish/", abstract = "We show that every linearly recursive query can be expressed as a transitive closure possibly preceded and followed by operations already available in relational algebra. This reduction is possible even if there are repeated variables in the recursive literals and if some of the arguments in the recursive literals are constants. Such an equivalence has significant theoretical and practical ramifications. One the one hand it influences the design of expressive notations to capture recursion as an augmentation of relational query languages. On the other hand implementation of deductive databases is impacted in that the design does not have to provide the generality that linear recursion would demand. It suffices to study the single problem of transitive closure and to provide an efficient implementation for it.", acknowledgement = ack-nhfb, generalterms = "Languages; Theory", subject = "Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Naughton:1987:OSR, author = "J. F. Naughton", title = "One-sided recursions", crossref = "ACM:1987:PPS", pages = "340--348", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p340-naughton/p340-naughton.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p340-naughton/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p340-naughton/", abstract = "The performance of systems with recursive query languages can be improved by recognizing simple, easily evaluable classes of recursions and using algorithms tailored to these classes whenever possible. In this paper we identify a useful subset of recursive definitions, the {\em one-sided recursions}. We show how to detect one-sided recursions, and give two simple evaluation algorithms that cover one-sided definitions in that for any selection on a one-sided definition, at least one of the two algorithms will apply. These algorithms have simple termination conditions, maintain minimal state and use selections on the recursively defined relation whenever possible. We show that there are no similar algorithms for many-sided recursions We also prove that it is undecidable whether an arbitrary definition has an equivalent one-sided definition. However, we do present a procedure that converts many potentially one-sided recursions to one-sided form, and prove it complete for a useful class of recursions.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages; Management; Performance; Theory", keywords = "algorithms; languages; management; performance; theory", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Theory of Computation --- Logics and Meanings of Programs --- Studies of Program Constructs (F.3.3): {\bf Program and recursion schemes}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}", } @InProceedings{Zhang:1987:NCD, author = "Weining Zhang and C. T. Yu", title = "A necessary condition for a doubly recursive rule to be equivalent to a linear recursive rule", crossref = "Dayal:1987:PAC", pages = "345--356", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p345-zhang/p345-zhang.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p345-zhang/", abstract = "Nonlinear recursive queries are usually less efficient in processing than linear recursive queries. It is therefore of interest to transform non-linear recursive queries into linear ones. We obtain a necessary and sufficient condition for a doubly recursive rule of a certain type to be logically equivalent to a single linear recursive rule obtained in a specific way.", acknowledgement = ack-nhfb, generalterms = "Languages; Theory", subject = "Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}", } @InProceedings{Sagiv:1987:ODP, author = "Y. Sagiv", title = "Optimizing datalog programs", crossref = "ACM:1987:PPS", pages = "349--362", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/28659/p349-sagiv/p349-sagiv.pdf; http://www.acm.org/pubs/citations/proceedings/pods/28659/p349-sagiv/; http://www.acm.org:80/pubs/citations/proceedings/pods/28659/p349-sagiv/", abstract = "Datalog programs, i.e., Prolog programs without function symbols, are considered It is assumed that a variable appearing in the head of a rule must also appear in the body of the rule. The input of a program is a set of ground atoms (which are given in addition to the program's rules) and, therefore, can be viewed as an assignment of relations to some of the program's predicates. Two programs are equivalent if they produce the same result for all possible assignments of relations to the extensional predicates (i.e., the predicates that do not appear as heads of rules). Two programs are uniformly equivalent if they produce the same result for all possible assignments of initial relations to all the predicates (i.e., both extensional and intentional). The equivalence problem for Datalog programs is known to be undecidable. It is shown that uniform equivalence is decidable, and an algorithm is given for minimizing a Datalog program under uniform equivalence. A technique for removing parts of a program that are redundant under equivalence (but not under uniform equivalence) is developed. A procedure for testing uniform equivalence is also developed for the case in which the database satisfies some constraints.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages; Management; Theory; Verification", keywords = "algorithms; languages; management; theory; verification", subject = "{\bf I.2.7} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Natural Language Processing, DATALOG. {\bf G.2.m} Mathematics of Computing, DISCRETE MATHEMATICS, Miscellaneous. {\bf F.3.3} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Studies of Program Constructs, Program and recursion schemes.", } @InProceedings{Morgenstern:1987:SIM, author = "Matthew Morgenstern", title = "Security and inference in multilevel database and knowledge-base systems", crossref = "Dayal:1987:PAC", pages = "357--373", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p357-morgenstern/p357-morgenstern.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p357-morgenstern/", abstract = "This paper addresses the threat to multilevel security that arises from logical inference and the semantics of the application. Such compromises of security are particularly challenging since they circumvent traditional security mechanisms and rely on a user's knowledge of the application. The problems of inference and security have heretofore been amorphous and difficult to circumscribe. We focus on these problems in the context of a multilevel database system and show their relevance to knowledge-based systems, sometimes referred to as expert systems. Here we establish a framework for studying these inference control problems, describe a representation for relevant semantics of the application, develop criteria for safety and security of a system to prevent these problems, and outline algorithms for enforcing these criteria.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Security", subject = "Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Deduction}; Information Systems --- Database Management --- Systems (H.2.4); Computing Methodologies --- Artificial Intelligence --- Applications and Expert Systems (I.2.1); Information Systems --- Database Management --- General (H.2.0): {\bf Security, integrity, and protection**}", } @InProceedings{Stemple:1987:MMF, author = "David Stemple and Subhasish Mazumdar and Tim Sheard", title = "On the modes and meaning of feedback to transaction designers", crossref = "Dayal:1987:PAC", pages = "374--386", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p374-stemple/p374-stemple.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p374-stemple/", abstract = "An analysis of database transactions in the presence of database integrity constraints can lead to several modes of feedback to transaction designers. The different kinds of feedback include tests and updates that could be added to the transaction to make it obey the integrity constraints, as well as predicates representing post-conditions guaranteed by a transaction's execution. We discuss the various modes, meanings, and uses of feedback. We also discuss methods of generating feedback from integrity constraints, transaction details and theorems constituting both generic knowledge of database systems and specific knowledge about a particular database. Our methods are based on a running system that generates tailored theories about database systems from their schemas and uses these theories to prove that transactions obey integrity constraints.", acknowledgement = ack-nhfb, generalterms = "Design; Documentation; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- General (H.2.0): {\bf Security, integrity, and protection**}; Theory of Computation --- Logics and Meanings of Programs --- Specifying and Verifying and Reasoning about Programs (F.3.1): {\bf Pre- and post-conditions}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Normal forms}", } @InProceedings{Rubenstein:1987:BSD, author = "W. B. Rubenstein and M. S. Kubicar and R. G. G. Cattell", title = "Benchmarking simple database operations", crossref = "Dayal:1987:PAC", pages = "387--394", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p387-rubenstein/p387-rubenstein.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p387-rubenstein/", abstract = "There are two widely-known benchmarks for database management systems the TP1 benchmarks (Anon {\em et al\/} [1985]), designed to measure transaction throughout, and the Wisconsin benchmarks (Bitton, Dewitt, Turbyfil [1984]), designed to measure the performance of a relational query processor. In our work with databases on engineering workstations, we found neither of these benchmarks a suitable measure for our applications' needs. Instead, our requirements are for {\em response time\/} for simple queries. We propose benchmark measurements to measure response time, specifically designed for the simple, object-oriented queries that engineering database applications perform. We report results from running this benchmark against some database systems we use ourselves, and provide enough detail for others to reproduce the benchmark measurements on other relational, object-oriented, or specialized database systems. We discuss a number of factors that make an order of magnitude improvement in benchmark performance caching the entire database in main memory, avoiding query optimization overhead, using physical links for prejoins, and using an alternative to the generally-accepted database ``server'' architecture on distributed networks.", acknowledgement = ack-nhfb, subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computer Systems Organization --- Performance of Systems (C.4); Computing Milieux --- Management of Computing and Information Systems --- Installation Management (K.6.2): {\bf Benchmarks}", } @InProceedings{Gray:1987:MRT, author = "Jim Gray and Franco Putzolu", title = "The $5$ minute rule for trading memory for disc accesses and the $10$ byte rule for trading memory for {CPU} time", crossref = "Dayal:1987:PAC", pages = "395--398", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p395-gray/p395-gray.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p395-gray/", abstract = "If an item is accessed frequently enough, it should be main memory resident. For current technology, ``frequently enough'' means about every five minutes. \par Along a similar vein, one can frequently trade memory space for CPU time. For example, bits can be packed in a byte at the expense of extra instructions to extract the bits. It makes economic sense to spend ten bytes of main memory to save one instruction per second. \par These results depend on current price ratios of processors, memory and disc accesses. These ratios are changing and hence the constants in the rules are changing.", acknowledgement = ack-nhfb, generalterms = "Design; Performance; Reliability; Theory", subject = "Computer Systems Organization --- Performance of Systems (C.4); Information Systems --- Database Management --- Physical Design (H.2.2); Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2)", } @InProceedings{Richardson:1987:DEP, author = "James P. Richardson and Hongjun Lu and Krishna Mikkilineni", title = "Design and evaluation of parallel pipelined join algorithms", crossref = "Dayal:1987:PAC", pages = "399--409", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p399-richardson/p399-richardson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p399-richardson/", abstract = "The join operation is the most costly operation in relational database management systems. Distributed and parallel processing can effectively speed up the join operation. In this paper, we describe a number of highly parallel and pipelined multiprocessor join algorithms using sort-merge and hashing techniques. Among them, two algorithms are parallel and pipelined versions of traditional sort-merge join methods, two algorithms use both hashing and sort-merge techniques, and another two are variations of the hybrid hash join algorithms. The performance of those algorithms is evaluated analytically against a generic database machine architecture. The methodology used in the design and evaluation of these algorithms is also discussed. \par The results of the analysis indicate that using a hashing technique to partition the source relations can dramatically reduce the elapsed time hash-based algorithms outperform sort-merge algorithms in almost all cases because of their high parallelism. Hash-based sort-merge and hybrid hash methods provide similar performance in most cases. With large source relations, the algorithms which replicate the smaller relation usually give better elapsed time. Sharing memory among processors also improves performance somewhat.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance; Theory", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Mathematics of Computing --- Numerical Analysis --- General (G.1.0): {\bf Parallel algorithms}", } @InProceedings{Butler:1987:SRO, author = "Margaret H. Butler", title = "Storage reclamation in object oriented database systems", crossref = "Dayal:1987:PAC", pages = "410--425", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p410-butler/p410-butler.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p410-butler/", abstract = "When providing data management for nontraditional data, database systems encounter storage reclamation problems similar to those encountered by virtual memory managers. The paging behavior of existing automatic storage reclamation schemes as applied to objects stored in a database management system is one indicator of the performance cost of various features of storage reclamation algorithms. The results of modeling the paging behavior suggest that Mark and Sweep causes many more input/output operations than Copy-Compact. A contributing factor to the expense of Mark and Sweep is that it does not recluster memory as does Copy-Compact. If memory is not reclustered, the average cost of accessing data can go up tremendously. Other algorithms that do not recluster memory also suffer performance problems, namely all reference counting schemes. The main advantage of a reference count scheme is that it does not force a running program to pause for a long period of time while reclamation takes place, it amortizes the cost of reclamation across all accesses. The reclustering of Copy-Compact and the cost amortization of Reference Count are combined to great advantage in Baker's algorithm. This algorithm proves to be the least prohibitive for operating on disk-based data.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance", subject = "Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2)", } @InProceedings{Faloutsos:1987:AOO, author = "Christos Faloutsos and Timos Sellis and Nick Roussopoulos", title = "Analysis of object oriented spatial access methods", crossref = "Dayal:1987:PAC", pages = "426--439", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p426-faloutsos/p426-faloutsos.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p426-faloutsos/", abstract = "This paper provides an analysis of R-trees and a variation (R + -trees) that avoids overlapping rectangles in intermediate nodes of the tree. The main contributions of the paper are the following. We provide the first known analysis of R-trees. Although formulas are given for objects in one dimension (line segments), they can be generalized for objects in higher dimensions as well. We show how the transformation of objects to higher dimensions [HINR83] can be effectively used as a tool for the analysis of R- and R + - trees. Finally, we derive formulas for R + -trees and compare the two methods analytically. The results we obtained show that R + -trees require less than half the disk accesses required by a corresponding R-tree when searching files of real life sizes R + -trees are clearly superior in cases where there are few long segments and a lot of small ones.", acknowledgement = ack-nhfb, generalterms = "Performance", subject = "Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Access methods}; Information Systems --- Database Management --- Systems (H.2.4)", } @InProceedings{Hanson:1987:PAV, author = "Eric N. Hanson", title = "A performance analysis of view materialization strategies", crossref = "Dayal:1987:PAC", pages = "440--453", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p440-hanson/p440-hanson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p440-hanson/", abstract = "The conventional way to process commands for relational views is to use query modification to translate the commands into ones on the base relations. An alternative approach has been proposed recently, whereby materialized copies of views are kept, and incrementally updated immediately after each modification of the database. A related scheme exists, in which update of materialized views is deferred until just before data is retrieved from the view. A performance analysis is presented comparing the cost of query modification, immediate view maintenance, and deferred view maintenance. Three different models of the structure of views are given a simple selection and projection of one relation, the natural join of two relations, and an aggregate (e.g., the sum of values in a column) over a selection-projection view. The results show that the choice of the most efficient view maintenance method depends heavily on the structure of the database, the view definition, and the type of query and update activity present.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Performance", subject = "Information Systems --- Database Management --- Logical Design (H.2.1); Information Systems --- Database Management --- Physical Design (H.2.2)", } @InProceedings{Segev:1987:LMT, author = "Arie Segev and Arie Shoshani", title = "Logical modeling of temporal data", crossref = "Dayal:1987:PAC", pages = "454--466", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p454-segev/p454-segev.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p454-segev/", abstract = "In this paper we examine the semantics and develop constructs for temporal data independent of any traditional data model, such as the relational or network data models. Unlike many other works which extend existing models to support temporal data, our purpose is to characterize the properties of temporal data and operators over them without being influenced by traditional models which were not specifically designed to model temporal data. We develop data constructs that represent sequences of temporal values, identify their semantic properties, and define operations over these structures.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Theory", subject = "Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2): {\bf Algebraic approaches to semantics}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Constructs and Features (D.3.3): {\bf Abstract data types}", } @InProceedings{McKenzie:1987:ERA, author = "Edwin McKenzie and Richard Snodgrass", title = "Extending the relational algebra to support transaction time", crossref = "Dayal:1987:PAC", pages = "467--478", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p467-mckenzie/p467-mckenzie.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p467-mckenzie/", abstract = "In this paper we discuss extensions to the conventional relational algebra to support transaction time. We show that these extensions are applicable to historical algebras that support valid time, yielding a temporal algebraic language. Since transaction time concerns the storage of information in the database, the notion of state is central. The extensions are formalized using denotational semantics. The additions preserve the useful properties of the conventional relational algebra.", acknowledgement = ack-nhfb, generalterms = "Languages; Theory", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2): {\bf Algebraic approaches to semantics}", } @InProceedings{Rubenstein:1987:DDM, author = "W. Bradley Rubenstein", title = "A database design for musical information", crossref = "Dayal:1987:PAC", pages = "479--490", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p479-rubenstein/p479-rubenstein.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p479-rubenstein/", abstract = "As part of our research into a general purpose data management system for musical information, a major focus has been the development of tools to support a data model for music. This paper first outlines the various types of information that fall under the purview of our proposed data manager. We consider extensions to the entity-relationship data model to implement the notion of {\em hierarchical ordering}, commonly found in musical data. We then present examples from our schema for representing musical notation in a database, taking advantage of these extensions.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Computer Applications --- Arts and Humanities (J.5): {\bf Music**}; Information Systems --- Database Management --- General (H.2.0); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Hudson:1987:OOD, author = "Scott E. Hudson and Roger King", title = "Object-oriented database support for software environments", crossref = "Dayal:1987:PAC", pages = "491--503", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p491-hudson/p491-hudson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p491-hudson/", abstract = "Cactis is an object-oriented, multi-user DBMS developed at the University of Colorado. The implementation is self-adaptive and concurrent, and runs in the Unix/C Sun workstation environment. A central, unique focus of Cactis is the support of functionally-defined data in a manner which provides good performance. Cactis is intended for use in applications which are conducive to an object-oriented approach and involve derived data. Such applications include software environments. \par Cactis supports the construction of objects and type/subtype hierarchies, which are useful for managing the complex and highly-interrelated data found in software environments. Such data types include programs, requirement specifications, milestone reports, configurations, documentation, and many others. Cactis uses techniques based on attributed graphs to ensure that functionally-defined attributes of objects, such as compilation dependencies, cost calculations, and milestone dependencies can be maintained efficiently. Since it is necessary to dynamically add new tools (such as debuggers and compilers) to a software environment, the DBMS allows the user to extend the type structure. The system also supports an efficient rollback and recovery mechanism, which provides the framework for a software version facility.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Software --- Software Engineering --- Programming Environments (D.2.6); Software --- Programming Languages --- Language Constructs and Features (D.3.3); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Croft:1987:SOD, author = "W. B. Croft and D. W. Stemple", title = "Supporting office document architectures with constrained types", crossref = "Dayal:1987:PAC", pages = "504--509", year = "1987", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/38713/p504-croft/p504-croft.pdf; http://www.acm.org/pubs/citations/proceedings/mod/38713/p504-croft/", abstract = "Data models have been proposed as a means of defining the objects and operations in an office information system. Office documents, because of their highly variable structure and multimedia content, are a difficult class of objects to model. The modeling task is further complicated by document architecture standards used for interchange between systems. We present an approach to data modeling based on constrained type definitions that allows architecture standards to be defined and ensures that individual document types conform to those standards. The ADABTPL model, which is used to define the schema of document types and standards, is described.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Information Systems Applications --- Office Automation (H.4.1); Software --- Programming Languages --- Language Constructs and Features (D.3.3): {\bf Data types and structures}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Constructs and Features (D.3.3): {\bf Abstract data types}", } @InProceedings{Delgrande:1987:FBA, author = "J. P. Delgrande", title = "Formal Bounds on Automatic Generation and Maintenance of Integrity Constraints", crossref = "ACM:1987:PPS", pages = "??--??", month = mar, year = "1987", bibsource = "Database/Wiederhold.bib; http://www.math.utah.edu/pub/tex/bib/pods.bib", } @InProceedings{Chandra:1988:TDQ, author = "Ashok K. Chandra", title = "Theory of database queries", crossref = "ACM:1988:PPS", pages = "1--9", year = "1988", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p1-chandra/p1-chandra.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p1-chandra/", acknowledgement = ack-nhfb, } @InProceedings{Swami:1988:OLJ, author = "Arun Swami and Anoop Gupta", title = "Optimization of large join queries", crossref = "ACM:1988:PAC", pages = "8--17", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p8-swami/p8-swami.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p8-swami/", abstract = "We investigate the problem of optimizing Select--Project--Join queries with large numbers of joins. Taking advantage of commonly used heuristics, the problem is reduced to that of determining the optimal join order. This is a hard combinatorial optimization problem. Some general techniques, such as iterative improvement and simulated annealing, have often proved effective in attacking a wide variety of combinatorial optimization problems. In this paper, we apply these general algorithms to the large join query optimization problem. We use the statistical techniques of factorial experiments and analysis of variance (ANOVA) to obtain reliable values for the parameters of these algorithms and to compare these algorithms. One interesting result of our experiments is that the relatively simple iterative improvement proves to be better than all the other algorithms (included the more complex simulated annealing). We also find that the general algorithms do quite well at the maximum time limit.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Computing Methodologies --- Simulation and Modeling --- Applications (I.6.3); Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Mathematics of Computing --- Numerical Analysis --- Optimization (G.1.6); Mathematics of Computing --- Numerical Analysis --- Numerical Linear Algebra (G.1.3): {\bf Linear systems (direct and iterative methods)}; Mathematics of Computing --- Discrete Mathematics --- Combinatorics (G.2.1): {\bf Combinatorial algorithms}", } @InProceedings{Kuper:1988:EPL, author = "Gabriel M. Kuper", title = "On the expressive power of logic programming languages with sets", crossref = "ACM:1988:PPS", pages = "10--14", year = "1988", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p10-kuper/p10-kuper.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p10-kuper/", acknowledgement = ack-nhfb, } @InProceedings{Shmueli:1988:RRC, author = "Oded Shmueli and Shalom Tsur and Carlo Zaniolo", title = "Rewriting of rules containing set terms in a logic data language {LDL}", crossref = "ACM:1988:PPS", pages = "15--28", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p15-shmueli/p15-shmueli.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p15-shmueli/", abstract = "We propose compilation methods for supporting set terms in Horn clause programs, without using general-purpose set matching algorithms, which tend to run in times exponential in the size of the participating sets Instead, we take the approach of formulating specialized computation plans that, by taking advantage of information available in the given rules, limit the number of alternatives explored. Our strategy is to employ {\em compile time\/} rewriting techniques and to transform the problem into an ``ordinary'' Horn clause compilation problem, with minimal additional overhead. The execution cost of the rewritten rules is substantially lower than that of the original rules and the additional cost of compilation can thus be amortized over many executions", acknowledgement = ack-nhfb, } @InProceedings{Lohman:1988:GLF, author = "Guy M. Lohman", title = "Grammar-like functional rules for representing query optimization alternatives", crossref = "ACM:1988:PAC", pages = "18--27", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p18-lohman/p18-lohman.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p18-lohman/", abstract = "Extensible query optimization requires that the ``repertoire'' of alternative strategies for executing queries be represented as data, not embedded in the optimizer code. Recognizing that query optimizers are essentially expert systems, several researchers have suggested using strategy rules to transform query execution plans into alternative or better plans. Though extremely flexible, these systems can be very inefficient at any step in the processing, many rules may be eligible for application and complicated conditions must be tested to determine that eligibility during unification. We present a constructive, ``building blocks'' approach to defining alternative plans, in which the rules defining alternatives are an extension of the productions of a grammar to resemble the definition of a function in mathematics. The extensions permit each token of the grammar to be parametrized and each of its alternative definitions to have a complex condition. The terminals of the grammar are base-level database operations on tables that are interpreted at run-time. The non-terminals are defined declaratively by production rules that combine those operations into meaningful plans for execution. Each production produces a set of alternative plans, each having a vector of properties, including the estimated cost of producing that plan. Productions can require certain properties of their inputs, such as tuple order and location, and we describe a ``glue'' mechanism for augmenting plans to achieve the required properties. We give detailed examples to illustrate the power and robustness of our rules and to contrast them with related ideas.", acknowledgement = ack-nhfb, generalterms = "Languages; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Mathematical Logic and Formal Languages --- Grammars and Other Rewriting Systems (F.4.2): {\bf Grammar types}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Clustering}", } @InProceedings{Muralikrishna:1988:EDM, author = "M. Muralikrishna and David J. DeWitt", title = "Equi-depth multidimensional histograms", crossref = "ACM:1988:PAC", pages = "28--36", year = "1988", bibdate = "Wed Oct 25 08:47:40 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p28-muralikrishna/p28-muralikrishna.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p28-muralikrishna/", acknowledgement = ack-nhfb, } @InProceedings{Paredaens:1988:PLU, author = "Jan Paredaens and Dirk {Van Gucht}", title = "Possibilities and limitations of using flat operators in nested algebra expressions", crossref = "ACM:1988:PPS", pages = "29--38", year = "1988", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p29-paredaens/p29-paredaens.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p29-paredaens/", acknowledgement = ack-nhfb, } @InProceedings{Garza:1988:TMO, author = "Jorge F. Garza and Won Kim", title = "Transaction management in an object-oriented database system", crossref = "ACM:1988:PAC", pages = "37--45", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p37-garza/p37-garza.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p37-garza/", abstract = "In this paper, we describe transaction management in ORION, an object-oriented database system. The application environments for which ORION is intended led us to implement the notions of sessions of transactions, and hypothetical transactions (transactions which always abort). The object-oriented data model which ORION implements complicates locking requirements. ORION supports a concurrency control mechanism based on extensions to the current theory of locking, and a transaction recovery mechanism based on conventional logging.", acknowledgement = ack-nhfb, generalterms = "Design; Reliability; Security", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Recovery and restart}; Information Systems --- Information Storage and Retrieval --- Systems and Software (H.3.4): {\bf ORION}; Information Systems --- Database Management --- Database Administration (H.2.7): {\bf Logging and recovery}; Data --- Files (E.5): {\bf Backup/recovery}", } @InProceedings{Hull:1988:EPD, author = "Richard Hull and Jianwen Su", title = "On the expressive power of database queries with intermediate types", crossref = "ACM:1988:PPS", pages = "39--51", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p39-hull/p39-hull.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p39-hull/", abstract = "The {\em set-height\/} of a complex object type is defined to be its level of nesting of the set construct. In a query of the complex object calculus which maps a database {$D$} to an output type {\em T}, an {\em intermediate type\/} is a type which is used by some variable of the query, but which is not present in {$D$} or {\em T}. For each $k$, $i$ ? 0 we define CALC {\em k,i\/} to be the family of calculus queries mapping from and to types with set-height $k$ and using intermediate types with set-height $i$ In particular, CALC 0,0 is the relational calculus, and CALC 0,1 is equivalent to the family of second-order (relational) queries \par Several results concerning these families of languages are obtained. A primary focus is on the families CALC 0,i, which map relations to relations Upper bounds on the complexity of these families are provided, and it is shown that CALC 0,3 has at least the complexity of exponential space. The CALC 0,i hierarchy does not collapse, because for each {\em i}, CALC 0,i is strictly less expressive than CALC 0,i+2. The union 0i CALC 0,i is strictly less expressive than the family of `computable' database queries. \par The expressive power of queries from the complex object calculus interpreted using a semantics based on the use of arbitrarily large finite numbers of {\em invented values\/} is studied. Under this semantics, the expressive power of the relational calculus is not increased, and the CALC 0,i hierarchy collapses at CALC 0,1. We also consider queries which use a bounded number of invented values.", acknowledgement = ack-nhfb, } @InProceedings{Jagannathan:1988:SDS, author = "D. Jagannathan and B. L. Fritchman and R. L. Guck and J. P. Thompson and D. M. Tolbert", title = "{SIM}: a database system based on the semantic data model", crossref = "ACM:1988:PAC", pages = "46--55", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p46-jagannathan/p46-jagannathan.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p46-jagannathan/", abstract = "SIM is a fully featured, commercially available database management system based on a semantic data model similar to Hammer and McLeod's SDM SIM has two primary modeling goals. The first is to narrow the gap between a user's real-world perception of data and the conceptual view imposed by the database system because of modeling presuppositions or limitations. The second goal is to allow, as much as possible, the semantics of data to be defined in the schema and make the database system responsible for enforcing its integrity SIM provides a rich set of constructs for schema definition, including those for specifying generalization hierarchies modeled by directed acyclic graphs, interobject relationships and integrity constraints. It also features a novel, easy-to-use, English-like DML. This paper describes the key modeling features of SIM, the architecture of the system and its implementation considerations.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Classifications (D.3.2): {\bf Nonprocedural languages**}; Computing Methodologies --- Symbolic and Algebraic Manipulation --- Languages and Systems (I.1.3): {\bf Nonprocedural languages**}", } @InProceedings{Kifer:1988:AAD, author = "Michael Kifer and Raghu Ramakrishnan and Avi Silberschatz", title = "An axiomatic approach to deciding query safety in deductive databases", crossref = "ACM:1988:PPS", pages = "52--60", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p52-kifer/p52-kifer.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p52-kifer/", abstract = "A database query is {\em safe\/} if its result consists of a finite set of tuples. If a query is expressed using a set of pure Horn Clauses, the problem of determining query safety is, in general, undecidable. In this paper we consider a slightly stronger notion of safety, called {\em supersafety}, for Horn databases in which function symbols are replaced by the abstraction of infinite relations with {\em finiteness constraints\/} [Ramarkrishman et. al 87] We show that the supersafety problem is not only decidable, but also {\em axiomatizable}, and the axiomatization yields an effective decision procedure. Although there are safe queries which are not supersafe, we demonstrate that the latter represent quite a large and nontrivial portion of the safe of all safe queries", acknowledgement = ack-nhfb, } @InProceedings{Caruso:1988:CMO, author = "Michael Caruso and Edward Sciore", title = "Contexts and metamessages in object-oriented database programming language design", crossref = "ACM:1988:PAC", pages = "56--65", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p56-caruso/p56-caruso.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p56-caruso/", abstract = "VISION is an object-oriented database system currently used commercially to develop investment analysis and other large statistical applications. Characteristic of these applications, beside the standard issues of structural and computational richness, is the need to handle time, versions, and concurrency control in a manner that does not produce combinatoric complexity in object protocol. This paper describes the approach taken by VISION in addressing these issues.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Computer Applications --- Administrative Data Processing (J.1): {\bf Financial}", } @InProceedings{Chomicki:1988:TDD, author = "Jan Chomicki and Tomasz Imieli{\'n}ski", title = "Temporal deductive databases and infinite objects", crossref = "ACM:1988:PPS", pages = "61--73", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p61-chomicki/p61-chomicki.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p61-chomicki/", abstract = "We discuss deductive databases with one fixed occurrence of a monadic function symbol({\em successor\/}) per predicate Databases of this kind can be used in a natural way to model simple patterns of events repeated in time, and this is why we term them {\em temporal}. Temporal deductive databases are also interesting from a theoretical point of view, because they give rise to {\em infinite\/} least fix-points and {\em infinite\/} query answers. We study complexity properties of finite query answers and define the notion of {\em infinite objects\/} which makes some infinite least fixpoints computable in finite time", acknowledgement = ack-nhfb, } @InProceedings{Laurent:1988:PSI, author = "D. Laurent and N. Spyratis", title = "Partition semantics for incomplete information in relational databases", crossref = "ACM:1988:PAC", pages = "66--73", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p66-laurent/p66-laurent.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p66-laurent/", abstract = "We define partition semantics for databases with incomplete information and we present an algorithm for query processing in the presence of incomplete information and functional dependencies. We show that Lipski's model for databases with incomplete information can be seen as a special case of our model.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Formal Definitions and Theory (D.3.1): {\bf Syntax}; Theory of Computation --- Mathematical Logic and Formal Languages --- Formal Languages (F.4.3): {\bf Classes defined by grammars or automata}", } @InProceedings{Ullman:1988:COS, author = "Jeffrey D. Ullman and Moshe Y. Vardi", title = "The complexity of ordering subgoals", crossref = "ACM:1988:PPS", pages = "74--81", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p74-ullman/p74-ullman.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p74-ullman/", abstract = "Selection of an appropriate order for the evaluation of subgoals in a logical rule frequently is essential for efficiency. We formulate the problem as one of feasible subgoal orders and show that the question is inherently exponential in time. The proof is by reduction from linear-space alternating Turing machine recognition, which appears to be far easier, in this case, than the more obvious reduction from exponential-time (ordinary) Turing machines", acknowledgement = ack-nhfb, } @InProceedings{Yuan:1988:SCQ, author = "Li Yan Yuan and Ding-An Chiang", title = "A sound and complete query evaluation algorithm for relational databases with null values", crossref = "ACM:1988:PAC", pages = "74--81", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p74-yuan/p74-yuan.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p74-yuan/", abstract = "Reiter has proposed extended relational theory to formulate relational databases with null values and presented a query evaluation algorithm for such databases. However, due to indefinite information brought in by null values, Reiter's algorithm is sound but not complete. In this paper, we first propose an extended relation to represent indefinite information in relational databases. Then, we define an extended relational algebra for extended relations. Based on Reiter's extended relational theory, and our extended relations and the extended relational algebra, we present a sound and complete query evaluation algorithm for relational databases with null values", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Theory", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Morris:1988:AOS, author = "Katherine A. Morris", title = "An algorithm for ordering subgoals in {NAIL?}", crossref = "ACM:1988:PPS", pages = "82--88", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p82-morris/p82-morris.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p82-morris/", abstract = "Rule-goal graphs are the central data structures used in the NAIL system, a knowledge-base system being developed at Stanford University They are constructed while testing the applicability of {\em capture rules}, and traversed while generating ICODE to evaluate queries. Generating rule-goal graphs may be reduced to the problem of ordering subgoals. This paper gives an algorithm for generating rule-goal graphs efficiently, in time polynomial in the size of the rules if the arity of recursive predicates is bounded. The graphs generated may be suboptimal for some purposes, but the algorithm will always find a rule-goal graph if one exists. The algorithm has been implemented in Cprolog, and is currently being used to generate rule-goal graphs for the NAIL system", acknowledgement = ack-nhfb, } @InProceedings{Malvestuto:1988:DPS, author = "F. M. Malvestuto", title = "The derivation problem of summary data", crossref = "ACM:1988:PAC", pages = "82--89", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p82-malvestuto/p82-malvestuto.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p82-malvestuto/", abstract = "Given a statistical database consisting of two summary tables based on a common but not identical classification criterion (e.g., two geographical partitionings of a country) there are additional summary tables that are {\em derivable\/} in the sense that they are uniquely (i.e., with no uncertainty) determined by the tables given. Derivable tables encompass not only, of course, ``less detailed'' tables (that is, aggregated data) but also ``more detailed'' tables (that is, disaggregated data). Tables of the second type can be explicitly constructed by using a ``procedure of data refinement'' based on the graph representation of the correspondences between the categories of the two classification systems given in some cases, that is, when such a graph representation meets the {\em acyclicity\/} condition, the underlying database is ``equivalent'' to a single table (called {\em representative table\/}) and then a necessary and sufficient condition for a table to be derivable can be stated.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Graph algorithms}; Computing Methodologies --- Image Processing And Computer Vision --- Segmentation (I.4.6): {\bf Region growing, partitioning}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Data --- Data Structures (E.1): {\bf Tables**}; Mathematics of Computing --- Probability and Statistics (G.3): {\bf Statistical computing}; Computing Methodologies --- Artificial Intelligence --- Vision and Scene Understanding (I.2.10): {\bf Modeling and recovery of physical attributes}", } @InProceedings{Ramakrishnan:1988:OED, author = "Raghu Ramakrishnan and Catriel Beeri and Ravi Krishnamurthy", title = "Optimizing existential datalog queries", crossref = "ACM:1988:PPS", pages = "89--102", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p89-ramakrishnan/p89-ramakrishnan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p89-ramakrishnan/", abstract = "The problem of pushing projections in recursive rules has received little attention. The objective of this paper is to motivate this problem and present some (partial) solutions. We consider programs with function-free rules, also known as {\em Datalog\/} programs. After formally defining existential subqueries, we present a syntactic criterion for detecting them and then consider optimization in three areas (1) We identify the existential subqueries and make them explicit by rewriting the rules. This, in effect, automatically captures some aspects of Prolog's {\em cut\/} operator that are appropriate to the bottom-up model of computation (2) We eliminate argument positions in recursive rules by ``pushing projections'' (3) We observe that ``pushing projections'' in rules also has the effect of making some rules (even recursive rules) redundant and try to (identify and) discard them", acknowledgement = ack-nhfb, } @InProceedings{Alexander:1988:PDC, author = "W. Alexander and G. Copeland", title = "Process and dataflow control in distributed data-intensive systems", crossref = "ACM:1988:PAC", pages = "90--98", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p90-alexander/p90-alexander.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p90-alexander/", abstract = "{\em In dataflow architectures, each dataflow operation is typically executed on a single physical node. We are concerned with distributed data-intensive systems, in which each base (i.e., persistent) set of data has been declustered over many physical nodes to achieve load balancing. Because of large base set size, each operation is executed where the base set resides, and intermediate results are transferred between physical nodes. In such systems, each dataflow operation is typically executed on many physical nodes. Furthermore, because computations are data-dependent, we cannot know until run time which subset of the physical nodes containing a particular base set will be involved in a given dataflow operation. This uncertainty creates several problems}. \par {\em We examine the problems of efficient program loading, dataflow--operation activation and termination, control of data transfer among dataflow operations, and transaction commit and abort in a distributed data-intensive system. We show how these problems are interrelated, and we present a unified set of mechanisms for efficiently solving them. For some of the problems, we present several solutions and compare them quantitatively}.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Computer Systems Organization --- Processor Architectures --- Other Architecture Styles (C.1.3): {\bf Data-flow architectures}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Computer Systems Organization --- Processor Architectures --- Multiple Data Stream Architectures (Multiprocessors) (C.1.2): {\bf Parallel processors**}; Computer Systems Organization --- Computer-Communication Networks --- Network Architecture and Design (C.2.1): {\bf Packet-switching networks}", } @InProceedings{Copeland:1988:DPB, author = "George Copeland and William Alexander and Ellen Boughter and Tom Keller", title = "Data placement in {Bubba}", crossref = "ACM:1988:PAC", pages = "99--108", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p99-copeland/p99-copeland.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p99-copeland/", abstract = "{\em This paper examines the problem of data placement in Bubba, a highly-parallel system for data-intensive applications being developed at MCC. ``Highly-parallel'' implies that load balancing is a critical performance issue. ``Data-intensive'' means data is so large that operations should be executed where the data resides. As a result, data placement becomes a critical performance issue}. \par {\em In general, determining the optimal placement of data across processing nodes for performance is a difficult problem. We describe our heuristic approach to solving the data placement problem in Bubba. We then present experimental results using a specific workload to provide insight into the problem. Several researchers have argued the benefits of declustering (i e, spreading each base relation over many nodes). We show that as declustering is increased, load balancing continues to improve. However, for transactions involving complex joins, further declustering reduces throughput because of communications, startup and termination overhead}. \par {\em We argue that data placement, especially declustering, in a highly-parallel system must be considered early in the design, so that mechanisms can be included for supporting variable declustering, for minimizing the most significant overheads associated with large-scale declustering, and for gathering the required statistics}.", acknowledgement = ack-nhfb, generalterms = "Design; Performance; Security", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Computer Systems Organization --- Processor Architectures --- Multiple Data Stream Architectures (Multiprocessors) (C.1.2): {\bf Parallel processors**}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Clustering}; Information Systems --- Database Management --- Database Administration (H.2.7): {\bf Logging and recovery}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Reliability, availability, and serviceability}", } @InProceedings{Imielinski:1988:ECL, author = "Tomasz Imielinski and Shamim Naqvi", title = "Explicit control of logic programs through rule algebra", crossref = "ACM:1988:PPS", pages = "103--116", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p103-imielinski/p103-imielinski.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p103-imielinski/", abstract = "{\em In this paper we argue with a basic premise in logic programming research that the meaning of a program can be inferred from its syntax alone. We show that users may have a variety of intended models for programs and that a single program may give different intended models under different assumptions of semantics. Our conclusion is that it is impossible to infer the intended model from the syntax of the program and no single semantics will capture all the intended models. We propose as a solution an explicit specification of control. Towards this purpose we define a rule algebra. The user formulates a program as an algebraic specification that directs the execution towards the intended model. The interesting question at that point is how to efficiently implement such programs. We show a natural and easy transformation such that it takes as input an algebraic specification and produces as output a program belonging to a subclass of locally stratified programs. Moreover, there is a homomorphic correspondence between the algebraic expressions and their translations}.", acknowledgement = ack-nhfb, } @InProceedings{Patterson:1988:CRA, author = "David A. Patterson and Garth Gibson and Randy H. Katz", title = "A case for redundant arrays of inexpensive disks {(RAID)}", crossref = "ACM:1988:PAC", pages = "109--116", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p109-patterson/p109-patterson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p109-patterson/", abstract = "{\em Increasing performance of CPUs and memories will be squandered if not matched by a similar performance increase in I/O. While the capacity of Single Large Expensive Disks (SLED) has grown rapidly, the performance improvement of SLED has been modest. Redundant Arrays of Inexpensive Disks (RAID), based on the magnetic disk technology developed for personal computers, offers an attractive alternative to SLED, promising improvements of an order of magnitude in performance, reliability, power consumption, and scalability. This paper introduces five levels of RAIDs, giving their relative cost/performance, and compares RAID to an IBM 3380 and a Fujitsu Super Eagle}.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Hardware --- Input/Output and Data Communications --- Performance Analysis and Design Aids** (B.4.4); Hardware --- Memory Structures --- Performance Analysis and Design Aids** (B.3.3); Hardware --- Memory Structures --- Design Styles (B.3.2): {\bf Mass storage}", } @InProceedings{Kumar:1988:SBT, author = "Akhil Kumar and Michael Stonebraker", title = "Semantics based transaction management techniques for replicated data", crossref = "ACM:1988:PAC", pages = "117--125", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p117-kumar/p117-kumar.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p117-kumar/", abstract = "Data is often replicated in distributed database applications to improve availability and response time. Conventional multi-copy algorithms deliver fast response times and high availability for read-only transactions while sacrificing these goals for updates. In this paper, we propose a multi-copy algorithm that works well in both retrieval and update environments by exploiting special application semantics. By subdividing transactions into various categories, and utilizing a commutativity property, we demonstrate cheaper techniques and show that they guarantee correctness. A performance comparison between our techniques and conventional ones quantifies the extent of the savings.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Measurement; Performance; Reliability", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Reliability, availability, and serviceability}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Computing Milieux --- Management of Computing and Information Systems --- Installation Management (K.6.2): {\bf Performance and usage measurement}", } @InProceedings{Ramakrishna:1988:ABD, author = "M. V. Ramakrishna and P. Mukhopadhyay", title = "Analysis of bounded disorder file organization", crossref = "ACM:1988:PPS", pages = "117--125", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p117-ramakrishna/p117-ramakrishna.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p117-ramakrishna/", abstract = "Recently Litwin and Lomet proposed the Bounded Disorder (BD) file organization which uses a combination of hashing and tree indexing Lomet provided an approximate analysis with a mention of the difficulty involved in exact modeling and analysis. The performance analysis of the method involves solving a classical sequential occupancy problem. We encountered this problem in our attempt to obtain a general model for single access and almost single access retrieval methods developed in the recent years. In this paper, we develop a probability model and present some preliminary results of the exact analysis.", acknowledgement = ack-nhfb, } @InProceedings{ElAbbadi:1988:GPC, author = "Amr {El Abbadi} and Sam Toueg", title = "The group paradigm for concurrency control", crossref = "ACM:1988:PAC", pages = "126--134", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p126-el_abbadi/p126-el_abbadi.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p126-el_abbadi/", abstract = "We propose a paradigm for developing, describing and proving the correctness of concurrency control protocols for replicated databases in the presence of failures or communication restrictions. Our approach is to hierarchically divide the problem of achieving one-copy serializability by introducing the notion of a ``group'' that is a higher level of abstraction than transactions. Instead of dealing with the overall problem of serializing all transactions, our paradigm divides the problem into two simpler ones. (1) A {\em local policy\/} for each group that ensures a total order of all transactions in that group. (2) A {\em global policy\/} that ensures a correct serialization of all groups. We use the paradigm to demonstrate the similarities between several concurrency control protocols by comparing the way they achieve correctness.", acknowledgement = ack-nhfb, generalterms = "Design; Performance; Reliability", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Reliability, availability, and serviceability}", } @InProceedings{Srivastava:1988:AMM, author = "Jaideep Srivastava and Doron Rotem", title = "Analytical modeling of materialized view maintenance", crossref = "ACM:1988:PPS", pages = "126--134", year = "1988", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p126-srivastava/p126-srivastava.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p126-srivastava/", acknowledgement = ack-nhfb, } @InProceedings{Hadzilacos:1988:SGA, author = "Thanasis Hadzilacos", title = "Serialization graph algorithms for multiversion concurrency control", crossref = "ACM:1988:PPS", pages = "135--141", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p135-hadzilacos/p135-hadzilacos.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p135-hadzilacos/", abstract = "{\em We propose a new algorithmic framework for database concurrency control using multiple versions of data items and a serialization graph of the transactions as a synchronization technique, which generalizes all concurrency control methods known so far. This class of algorithms, called MVSGA for Multi Version Serialization Graph set of Algorithms, works by monitoring the acyclicity of the serialization graph which has nodes corresponding to transactions and arcs corresponding to read-from and other transaction positioning decisions made by the scheduler. For each of the major known schedulers we give examples of MVSGA schedulers that cover them}. \par {\em We propose a criterion for optimality among MVSGA schedulers Choice of versions to read from and relative positioning of transactions in the serialization graph should be done in a way that leaves the largest flexibility possible for future choices. This flexibility is measured as the number of pairs of nodes in the serialization graph that remain incomparable. Unfortunately, enforcing this criterion turns out to be NP-complete, so we describe an MVSGA scheduler based on a heuristic that approximates the optimal}.", acknowledgement = ack-nhfb, } @InProceedings{Breitbart:1988:MUI, author = "Yuri Breitbart and Avi Silberschatz", title = "Multidatabase update issues", crossref = "ACM:1988:PAC", pages = "135--142", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p135-breitbart/p135-breitbart.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p135-breitbart/", abstract = "A formal model of data updates in a multidatabase environment is developed, and a theory of concurrency control in such an environment is presented. We formulate a correctness condition for the concurrency control mechanism and propose a protocol that allows concurrent execution of a set of global transactions in presence of local ones. This protocol ensures the consistency of the multidatabase and deadlock freedom. We use the developed theory to prove the protocol's correctness and discuss complexity issues of implementing the proposed protocol.", acknowledgement = ack-nhfb, generalterms = "Design; Performance; Reliability", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Database Administration (H.2.7): {\bf Logging and recovery}", } @InProceedings{Kelter:1988:QPD, author = "Udo Kelter", title = "The queue protocol: a deadlock-free, homogeneous, non-two-phase locking protocol", crossref = "ACM:1988:PPS", pages = "142--151", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p142-kelter/p142-kelter.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p142-kelter/", abstract = "The M-pitfall protocol (MPP) is the most general homogeneous non-two-phase locking protocol which supports shared and exclusive locks. It has two major disadvantages: it is not deadlock-free and it has the paradoxical property that concurrency is often reduced if shared locks are used instead of exclusive locks. This paper presents a new protocol, the Queue Protocol (QP), which removes these deficiencies. Although the QP can be regarded an enhancement of the MPP, pitfalls are no more used in the QP; thus, the QP has the further advantage that processing overhead due to pitfalls is avoided.", acknowledgement = ack-nhfb, } @InProceedings{Abiteboul:1988:DFD, author = "Serge Abiteboul and Richard Hull", title = "Data functions, datalog and negation", crossref = "ACM:1988:PAC", pages = "143--153", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p143-abiteboul/p143-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p143-abiteboul/", abstract = "Datalog is extended to incorporate single-valued ``data functions'', which correspond to attributes in semantic models, and which may be base (user-specified) or derived (computed). Both conventional and stratified datalog are considered. Under the extension, a datalog program may not be consistent, because a derived function symbol may evaluate to something which is not a function. Consistency is shown to be undecidable, and is decidable in a number of restricted cases. A syntactic restriction, {\em panwise consistency}, is shown to guarantee consistency. The framework developed here can also be used to incorporate single-valued data functions into the Complex Object Language (COL), which supports deductive capabilities, complex database objects, and set-valued data functions. \par There is a natural correspondence between the extended datalog introduced here, and the usual datalog with functional dependencies. For families and of dependencies and a family of datalog programs , the - {\em implication problem\/} for asks, given sets F and G and a program P in , whether for all inputs I, I @@@@ F implies P(I) @@@@ G. The FD-FD implication problem is undecidable for datalog, and the TGD-EGD implication problem is decidable for stratified datalog. Also, the {\o}-MVD problem is undecidable (and hence also the MVD-preservation problem).", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Measurement; Performance", subject = "Computing Methodologies --- Artificial Intelligence --- Natural Language Processing (I.2.7): {\bf DATALOG}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf DAPLEX}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Banciihon:1988:OOD, author = "Fran{\c{c}}ois Banciihon", title = "Object-oriented database systems", crossref = "ACM:1988:PPS", pages = "152--162", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p152-banciihon/p152-banciihon.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p152-banciihon/", abstract = "This paper describes my vision of the current state of object-oriented database research. I first briefly define this field by its objectives, and relate it to other database subfields. I describe what I consider to be the main characteristics of an object oriented system, i.e., those which are important to integrate in a database system: encapsulation, object identity, classes or types, inheritance, overriding and late binding. I point out the differences between an object oriented system and an object oriented database system. I also point out the advantages and drawbacks of an object oriented database system with respect to a relational system. Finally, I list some research issues.", acknowledgement = ack-nhfb, } @InProceedings{Krishnamurthy:1988:FTS, author = "Ravi Krishnamurthy and Raghu Ramakrishnan and Oded Shmueli", title = "A framework for testing safety and effective computability of extended datalog", crossref = "ACM:1988:PAC", pages = "154--163", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p154-krishnamurthy/p154-krishnamurthy.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p154-krishnamurthy/", abstract = "This paper presents a methodology for testing a general logic program containing function symbols and built-in predicates for {\em safety\/} and {\em effective computability}. Safety is the property that the set of answers for a given query is finite. A related issues is whether the evaluation strategy can effectively compute all answers and terminate. We consider these problems under the assumption that queries are evaluated using a bottom-up fixpoint computation. We also approximate the use of function symbols by considering Datalog programs with infinite base relations over which {\em finiteness constraints\/} and {\em monotonicity constraints\/} are considered. One of the main results of this paper is a recursive algorithm, {\em check_clique}, to test the safety and effective computability of predicates in arbitrarily complex cliques. This algorithm takes certain procedures as parameters, and its applicability can be strengthened by making these procedures more sophisticated. We specify the properties required of these procedures precisely, and present a formal proof of correctness for algorithm {\em check_clique}. This work provides a framework for testing safety and effective computability of recursive programs, and is based on a clique by clique analysis. The results reported here form the basis of the safety testing for the LDL language, being implemented at MCC.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Computing Methodologies --- Artificial Intelligence --- Natural Language Processing (I.2.7): {\bf DATALOG}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}", } @InProceedings{Chan:1988:IRD, author = "Edward P. F. Chan and Hector J. Hernandez", title = "Independence-reducible database schemes", crossref = "ACM:1988:PPS", pages = "163--173", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p163-chan/p163-chan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p163-chan/", abstract = "A class of cover embedding database schemes, called independence-reducible, is proposed and is proven to be bounded and algebraic-maintainable, and therefore is highly desirable with respect to query answering and constraint enforcement. This class of schemes is shown to properly contain a superset of all previously known classes of cover embedding BCNF database schemes which are bounded (and constant-time-maintainable). An efficient algorithm is found which recognizes exactly this class of database schemes. Independence-reducible database schemes properly contain a class of constant-time-maintainable database schemes and a condition which characterizes this class of schemes is found, this condition can be tested efficiently. Throughout, it is assumed that a cover of the functional dependencies is embedded in the database scheme in the form of key dependencies.", acknowledgement = ack-nhfb, } @InProceedings{Chen:1988:IMR, author = "Qiming Chen and Georges Gardarin", title = "An implementation model for reasoning with complex objects", crossref = "ACM:1988:PAC", pages = "164--172", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p164-chen/p164-chen.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p164-chen/", abstract = "In this paper, we first propose a natural syntactical extension of DATALOG called NESTED_DATALOG for dealing with complex objects represented as nested predicates. Then, we introduce the token object model which is a simple extension of the relational model with tokens to represent complex objects and support referential information sharing. An implementation model of a NESTED_DATALOG program is defined by mapping it to the token object model which remains a straightforward extension of classical logical databases. Through this work, we can accommodate two basic requirements. The availability of a rule language for reasoning with complex objects, and the mechanism for mapping a complex object rule program to a relational DBMS offering a pure DATALOG rule language. In summary, the main contributions of the paper are the definition of a rule language for complex objects and the development of a technique to compile this complex object rule language to classical DATALOG.", acknowledgement = ack-nhfb, generalterms = "Languages; Theory; Verification", subject = "Computing Methodologies --- Artificial Intelligence --- Natural Language Processing (I.2.7): {\bf DATALOG}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Trees}", } @InProceedings{Kim:1988:OFD, author = "Myoung Ho Kim and Sakti Pramanik", title = "Optimal file distribution for partial match retrieval", crossref = "ACM:1988:PAC", pages = "173--182", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p173-kim/p173-kim.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p173-kim/", abstract = "In this paper we present data distribution methods for parallel processing environment. The primary objective is to process partial match retrieval type queries for parallel devices. \par The main contribution of this paper is the development of a new approach called FX (Fieldwise eXclusive) distribution for maximizing data access concurrency. An algebraic property of exclusive-or operation, and field transformation techniques are fundamental to this data distribution techniques. We have shown through theorems and corollaries that this FX distribution approach performs better than other methods proposed earlier. We have also shown, by computing probability of optimal distribution and query response time, that FX distribution gives better performance than others over a large class of partial match queries. This approach presents a new basis in which optimal data distribution for more general type of queries can be formulated.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Performance attributes}; Computer Systems Organization --- Processor Architectures --- Multiple Data Stream Architectures (Multiprocessors) (C.1.2): {\bf Parallel processors**}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}", } @InProceedings{Hegner:1988:DRS, author = "Stephen J. Hegner", title = "Decomposition of relational schemata into components defined by both projection and restriction", crossref = "ACM:1988:PPS", pages = "174--183", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p174-hegner/p174-hegner.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p174-hegner/", abstract = "A generalized approach to the decomposition of relational schemata is developed in which the component views may be defined using both restriction and projection operators, thus admitting both horizontal and vertical decompositions. The realization of restrictions is enabled through the use of a Boolean algebra of types, while true independence of projections is modelled by permitting null values in the base schema. The flavor of the approach is algebraic, with the collection of all candidate views of a decomposition modelled within a lattice-like framework, and the actual decompositions arising as Boolean subalgebraic. Central to the framework is the notion of {\em sidimensional join dependency}, which generalizes the classical notion of join dependency by allowing the components of the join to be selected horizontally as well as vertically. Several properties of such dependencies are presented, including a generalization of many of the classical results known to be equivalent to schema acyclicity. Finally, a characterization of the nature of dependencies which participate in decompositions is presented. It is shown that there are two major types, the bidimensional join dependencies, which are tuple generating and allow tuple removal by implicit encoding of knowledge, and splitting dependencies, which simply partition the database into two components.", acknowledgement = ack-nhfb, } @InProceedings{Hutflesz:1988:TGF, author = "Andreas Hutflesz and Hans-Werner Six and Peter Widmayer", title = "Twin grid files: space optimizing access schemes", crossref = "ACM:1988:PAC", pages = "183--190", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p183-hutflesz/p183-hutflesz.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p183-hutflesz/", abstract = "Storage access schemes for points, supporting spatial searching, usually suffer from an undesirably low storage space utilization. We show how a given set of points can be distributed among two grid files in such a way that storage space utilization is optimal. The optimal twin grid file can be built practically as fast as a standard grid file, i.e., the storage space optimality is obtained at almost no extra cost. We compare the performances of the standard grid file, the optimal static twin grid file, and an efficient dynamic twin grid file, where insertions and deletions trigger the redistribution of points among the two grid files. Twin grid files utilize storage space at roughly 90\%, as compared with the 69\% of the standard grid file. Typical range queries --- the most important spatial search operations --- can be answered in twin grid files at least as fast as in the standard grid file.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Computer Systems Organization --- Computer-Communication Networks --- Local and Wide-Area Networks (C.2.5): {\bf Access schemes}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Search process}; Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2): {\bf File organization}; Data --- Files (E.5): {\bf Optimization**}; Data --- Files (E.5): {\bf Organization/structure}", } @InProceedings{Batory:1988:CDS, author = "D. S. Batory", title = "Concepts for a database system compiler", crossref = "ACM:1988:PPS", pages = "184--192", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p184-batory/p184-batory.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p184-batory/", abstract = "We propose a very simple formalism based on parameterized types and a rule-based algebra to explain the storage structures and algorithms of database management systems. Implementations of DBMSs are expressed as equations If all functions referenced in the equations have been implemented the software for a DBMS can be synthesized in minutes at little cost, in contrast to current methods where man-years of effort and hundreds of thousands of dollars are required. Our research aims to develop a DBMS counterpart to today's compiler-compiler technologies", acknowledgement = ack-nhfb, } @InProceedings{Ramakrishna:1988:HPA, author = "M. V. Ramakrishna", title = "Hashing practice: analysis of hashing and universal hashing", crossref = "ACM:1988:PAC", pages = "191--199", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p191-ramakrishna/p191-ramakrishna.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p191-ramakrishna/", abstract = "Much of the literature on hashing deals with overflow handling (collision resolution) techniques and its analysis. What does all the analytical results mean in practice and how can they be achieved with practical files? This paper considers the problem of achieving analytical performance of hashing techniques in practice with reference to successful search lengths, unsuccessful search lengths and the expected worst case performance (expected length of the longest probe sequence). There has been no previous attempt to explicitly link the analytical results to performance of real life files. Also, the previously reported experimental results deal mostly with successful search lengths. We show why the well known division method performs ``well'' under a specific model of selecting the test file. We formulate and justify an hypothesis that by choosing functions from a particular class of hashing functions, the analytical performance can be obtained in practice on real life files. Experimental results presented strongly support our hypothesis. Several interesting problems arising are mentioned in conclusion.", acknowledgement = ack-nhfb, generalterms = "Design; Theory", subject = "Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2): {\bf File organization}; Data --- Data Storage Representations (E.2): {\bf Hash-table representations}", } @InProceedings{Hadzilacos:1988:TSO, author = "Thanasis Hadzilacos and Vassos Hadzilacos", title = "Transaction synchronisation in object bases", crossref = "ACM:1988:PPS", pages = "193--200", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p193-hadzilacos/p193-hadzilacos.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p193-hadzilacos/", abstract = "In this paper we investigate the problem of synchronising transactions in an object base. An object base is a collection of objects, much the way a database is a collection of data. An object, for our purposes, consists of a collection of variables (whose values at any point in time comprise the state of that object) and a set of operations, called methods, that are the only means of accessing (sensing or modifying) the object's variables \par There is a certain sense in which a traditional database is an object base. It consists of ``objects'' (records, tuples or what have you) each of which has a state that can be accessed only through the operations Read and Write. The main difference is that in an object base, each object supplies its own methods and these are arbitrary. In particular, a method for a certain object may call methods of other objects to carry out its task. In contrast to certain models in which objects correspond to ``levels of abstraction'', our model is completely general in this respect for example, it is permissible for a method of object {$A$} to call a method of object {$B$} which, in turn, may call some other method of object {$A$} again \par One implication of this difference between data and object bases is that in the latter the assumption, commonly made in the former, that the operations which manipulate the state of the objects are short enough to be implemented serially (one at a time) is no longer valid. A related implication is that in object bases we are faced with the necessity of dealing with nested transactions, since the invocation of one method may result in further method invocations \par Another, less fundamental, difference between data and object bases is that, in addition to being of uniform type, the ``objects'' of a database are usually assumed to be of uniform size as well. In an object base one can imagine objects of widely differing sizes. A clock and the New York City telephone directory could be objects differing in size by orders of magnitude, yet co-existing in the same object base \par In spite of these differences it is possible to approach concurrency control in an object base in the following way. Each object is viewed as a database item. Further, each method invocation is treated as a group of Read or Write operations on those data items that were accessed as a result of that method invocation. With these analogies, any conventional database concurrency control method (two-phase locking, timestamp ordering, certification, and the whole lot) can be employed to synchronise concurrent transactions in the object base. This approach has the virtue of simplicity and may be well-suited to certain environments. It is, for example, the approach taken in the GemStone project and product (cf Maier and Stein [1987], Purdy {\em et al\/} [1987]) \par We are interested in exploring approaches to concurrency control in object bases which take into account their special features and differences from databases. The hope is that this will lead to more efficient techniques. More specifically, we would like to consider mechanisms that \par Take into account the nested nature of transactions \par Allow methods accessing an object to execute concurrently (but correctly) This seems especially important as multiprocessors become available, since forcing serial access to an object's methods restricts parallelism (bear in mind that each method could be a lengthy procedure) \par Are modular, in that each object is responsible for synchronizing the invocations of its own methods as it sees fit \par The first two of these points have been considered by others as well. For example, Argus (cf Liskov and Scheifler [1983]) uses a synchronisation algorithm which is an adaptation of strict two-phase locking in a nested transaction environment. In addition, Argus allows multiple concurrent invo", acknowledgement = ack-nhfb, } @InProceedings{Ioannidis:1988:DMD, author = "Yannis E. Ioannidis and Miron Livny", title = "Data modeling in {DELAB}", crossref = "ACM:1988:PAC", pages = "200--200", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p200-ioannidis/p200-ioannidis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p200-ioannidis/", abstract = "As the size and complexity of processing and manufacturing systems increases, the need for Database Management Systems (DBMS) that meet the special needs of studies that experiment with such systems becomes more current. System analysts who study the performance of modern processing systems have to manipulate large amounts of data in order to profile the behavior of the system. They have to identify the relationship between the properties of a compound system and a wide spectrum of performance metrics. In a recent study in which we have analyzed a set of distributed concurrency control algorithms, we performed more than 1400 simulation experiments. Each experiment was characterized by more than 6000 input parameters and generated more than 400 output values. It is thus clear that powerful means for defining the structure and properties of complex systems are needed, as well as efficient tools to retrieve the data accumulated in the course of the study. We are currently engaged in an effort to develop and implement the DE {\em LAB simulation laboratory\/} that aims to provide such means and tools for simulation studies. \par The goal of the first phase of this effort was to design and implement a simulation language. It ended in 1986 when the DE {\em NET\/} (Discrete Event NETwork) simulation language became operational. The language is based on the concept of Discrete Event System Specifications (DEVS). It views the simulator as a collection of self contained objects that communicate via Discrete Event Connectors that provide a unified synchronization protocol In the past two years the language has been used in a number of real life studies. It was used to simulate distributed processing environments, communication protocols, and production lines Several tools have been developed around the language. All tools adhere to the same modeling methodology and thus create a cohesive simulation environment. \par In the second phase of the DE {\em LAB\/} project we have been addressing the data management problem DE {\em NET\/} has been interfaced to a special purpose relational DBMS that can store descriptions of simulation runs and provides access to the stored data Based on our experience with thus DBMS, we have reached the conclusion that system analysts need to be provided with a view of the data that differs from the way the DE {\em NET\/} program views the data, and thus decided to develop a data model that meets their needs. The M@@@@SE data model, which is the result of this effort, has an {\em object oriented\/} flavor. It was developed with the guidance of potential users and was tested on a number of real life simulation studies. \par Although the conception of M@@@@SE was motivated by the specific needs of a simulation laboratory, we believe that it addresses the representational needs of many other environments We have decided to support the notion of an {\em object}. Every object is assigned a unique identifier. Depending on their properties (attributes), objects can simultaneously belong to several {\em classes}, inheriting properties from all of them. Among these classes, one is characterized as the {\em primary\/} class of the object. The notion of a primary class helps achieving a ``conceptual'' as well as a physical clustering among similar objects. Collections of objects are supported as regular objects in M@@@@SE in the form of sets, multisets (bags), and arrays. The {\em extent\/} of a class, i.e., the objects that are known members of the class, is explicitly stored in the database. Every M@@@@SE database schema has a straightforward directed graph representation. Each node represents a class of objects and is labeled by the class name. Relationships between the classes in the schema are captured by the arcs of the graph. Similarly to most object-oriented data models, M@@@@SE has two major types of arcs {\em component arcs\/} and {\em inheritance arcs}\ldots{} \par ", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Performance", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computing Methodologies --- Simulation and Modeling --- Simulation Languages (I.6.2); Theory of Computation --- Mathematical Logic and Formal Languages --- Formal Languages (F.4.3): {\bf Classes defined by grammars or automata}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Ono:1988:DMT, author = "Kiyoshi Ono and Mikio Aoyama and Hiroshi Fujimoto", title = "Data management of telecommunications networks", crossref = "ACM:1988:PAC", pages = "201--201", year = "1988", bibdate = "Wed Oct 25 08:47:40 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p201-ono/p201-ono.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p201-ono/", acknowledgement = ack-nhfb, } @InProceedings{Herlihy:1988:HCC, author = "Maurice P. Herlihy and William E. Weihl", title = "Hybrid concurrency control for abstract data types", crossref = "ACM:1988:PPS", pages = "201--210", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p201-herlihy/p201-herlihy.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p201-herlihy/", abstract = "We define a new locking protocol that permits more concurrency than existing commutativity-based protocols. The protocol uses timestamps generated when transactions commit to provide more information about the serialization order of transactions, and hence to weaken the constraints on conflicts. In addition, the protocol permits operations to be both partial and non-deterministic, and it permits results of operations to be used in choosing locks. The protocol exploits type-specific properties of objects, necessary and sufficient constraints on lock conflicts are defined directly from a data type specification. We give a complete formal description of the protocol, encompassing both concurrency control and recovery, and prove that the protocol satisfies {\em hybrid atomicity}, a local atomicity property that combines aspects of static and dynamic atomic protocols. We also show that the protocol is optimal in the sense that no hybrid atomic locking scheme can permit more concurrency.", acknowledgement = ack-nhfb, } @InProceedings{Alho:1988:DDM, author = "Kari Alho and Hannu Peltonen and Martti M{\"a}ntyl{\"a} and Rejio Sulonen", title = "A design data manager", crossref = "ACM:1988:PAC", pages = "202--202", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p202-alho/p202-alho.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p202-alho/", abstract = "{\em HutBase\/} is a visual design data manager that can be used to store and manipulate data objects created and processed by a variety of design applications. In particular, HutBase allows the user to manipulate the data and start applications, and provides a access mechanism for the applications. \par HutBase consists of three software layers. The lowest layer, the {\em Object Management System\/} (OMS), is based on the Entity-Relationship model and includes those basic operations related to the storage and access of design data objects that are common to all applications. The database is divided into {\em workspaces}, which are collections of OMS {\em objects\/} and {\em relationships\/} organized according to an application-dependent schema and forming a significant whole (e.g., a design project) from the user's point of view Workspace is also the unit for locking and access control. \par An object is a collection of {\em attributes}. Each attribute has a name and value. The name is a string and the value is an arbitrary sequence of bytes. The value of an attribute can be of any length, from a single integer to an external representation of a complicated geometric model. A relationship is a named directed connection between two objects. Relationships have attributes like objects. \par The OMS library contains functions for creating, opening and removing workspaces, objects, relationships and attributes. All operations are carried out within {\em transactions}. The functions do not change the permanent data on the disk until the user calls the {\em save_changes\/} function, which saves the current state of all workspaces opened in a given transaction. \par The next layer is a prototype data model built on top of OMS, which stores the objects in each workspace as a hierarchical tree by means of relationships. The leaves of the hierarchy are called {\em representations\/} and contain the actual data manipulated by the applications. Each representation is associated with a {\em representation type}, which in turn are linked to the application programs, or {\em tools}. The representation types and tools are stored as objects in a separate workspace. \par The top level contains a user interface and a procedural application interface. The user interface shows the available representation types, tools, and contents of one or more workspaces in iconic form. A representation can be opened by selecting its icon on the screen. The tool corresponding to the type of the representation is then started with a handle to the representation as argument. The interface also allows the user to create, remove and copy objects. \par The tool programs run as subprocesses of the HutBase process. Tools access the data base by remote procedure calls that send data base requests from the tool process to the HutBase process. The tools can also create relationships between representations and navigate in the workspace by following the relationship links. \par We are currently working on a interpreted definition language that can be used to describe the structure of a workspace. The definition language will be based on an object-oriented notation, where object and relation types form a class hierarchy. Class descriptions include (possibly inherited) methods for dealing with the various HutBase operations. With the contemplated description facility, new object and relationship types can be defined by declaring new subclasses of the existing ones.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Computing Methodologies --- Computer Graphics --- Methodology and Techniques (I.3.6): {\bf Interaction techniques}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Naeymi-Rad:1988:RDD, author = "Frank Naeymi-Rad and Lowell Carmony and David Trace and Christine Georgakis and Max Harry Weil", title = "A relational database design in support of standard medical terminology in multi-domain knowledge bases", crossref = "ACM:1988:PAC", pages = "203--203", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p203-naeymi-rad/p203-naeymi-rad.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p203-naeymi-rad/", abstract = "Relational database techniques have been used to create knowledge bases for a medical diagnostic consultant system. Known as MEDAS (Medical Emergency Decision Assistance System), this expert system, using disorder patterns consisting of features such as symptoms and laboratory results, is able to diagnose multiple disorders. Database technology has been used in MEDAS to develop knowledge engineering tools, called the TOOL BOX, which permit domain experts to create knowledge without the assistance of a knowledge engineer. \par In the process of knowledge development with the TOOL BOX a standardization of terms was needed. This led us to design a Feature Dictionary and a grammar to support a standardized format for features. A common dictionary of features will allow us to merge knowledge bases, translate between multi-domain bases, and compare competing expert systems. In addition, standard terminology will assist communication across domains \par The Feature Dictionary has the following attributes {\em Long\/} forms of the feature name (White Blood Count) and {\em short\/} forms (WBC) as well as a three line description of the feature. The {\em type}, binary (Abdominal Pain), continuous-valued (WBC), or derived (pulse pressure = systolic - diastolic) is also kept for each feature \par For value features the appropriate {\em unit\/} (cc, kg, etc.) as well as {\em range\/} limits are stored so that these can be used as a form of quality control on input. The {\em permanence\/} (Y/N) of each feature is kept so it is possible to automatically include permanent features in future encounters. In addition, for each feature three separate ``{\em cost\/}'' parameters are kept. {\em Risk\/} measures the danger to the patient from no risk such as taking a blood pressure to highly invasive proceedings such as a liver biopsy. {\em Time\/} measures whether results can be expected in minutes, hours, or days. {\em Money\/} measures the actual cost to the patient FD-Equivalents stores the synonyms and antonyms of each feature. These are used to translate between knowledge bases using different terminology. \par Features were first classified in terms of a Problem Oriented Medical Record. We have added an anatomical reclassification in terms of body systems. Experts will be able to add new kinds of feature classifications. \par MEDAS, a multi-membership Bayesian model, needs binary representations for its inference. These Binary Features are created by the expert physician in the given disorder patterns. For example, ``WBC 50,000'', or ``Age 2 Female Hematocrit 42'' are binary features that might appear in a disorder pattern. Laboratory results often lead to a multiplicity of binary features (such as ``WBC 3,000'', or 3,000 WBC 10,000, etc.). Our design allows the user to enter the value of such a feature and have the system set of all the corresponding binary features. This intelligent user interface is controlled by a grammar that allows us to parse the binary features and generate rules for them. \par The knowledge base for a particular problem domain such as OB/GYN is organized as a collection of disorder patterns. Each of these is represented as a list of binary features and associated probabilities. The domain knowledge base contains only the features relevant to that domain. \par Experience with the Feature Dictionary has convinced us that there are many advantages in using a DBMS to store the knowledge base for an expert system. The TOOL BOX, originally in ACCENT-R, was rewritten in dBase III for the PC. The knowledge bases created on the PC were then ported to the mainframe. As the number of domains supported by MEDAS grew, it became evident that we needed a DBMS that could function in both environments so we are in the process of converting to ORACLE.", acknowledgement = ack-nhfb, generalterms = "Design; Human Factors", subject = "Computer Applications --- Life and Medical Sciences (J.3): {\bf Medical information systems}; Computing Methodologies --- Artificial Intelligence --- Applications and Expert Systems (I.2.1); Information Systems --- Information Storage and Retrieval --- Content Analysis and Indexing (H.3.1): {\bf Dictionaries}; Information Systems --- Database Management --- Systems (H.2.4)", } @InProceedings{Hernandez:1988:CCT, author = "H{\'e}ctor J. Hern{\'a}ndez and Edward P. F. Chan", title = "A characterization of constant-time maintainability for {BCNF} database schemes", crossref = "ACM:1988:PAC", pages = "209--217", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p209-hernandez/p209-hernandez.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p209-hernandez/", abstract = "The {\em maintenance problem\/} (for database states) of a database scheme R with respect to a set of functional dependencies {$F$} is the following decision problem. Let r be a consistent state of R with respect to {$F$} and assume we insert a tuple $t$ into {\em r p\/} [epsilon] r. Is $r$ ? $t$ a consistent state of R with respect to {$F$}? R is said to be {\em constant-time-maintainable\/} with respect to {$F$} if there is an algorithm that solves the maintenance problem of R with respect to {$F$} in time independent of the state size. \par A characterization of constant-time-maintainability for the class of BCNF database schemes is given. An efficient algorithm that tests this characterization is shown, as well as an algorithm for solving the maintenance problem in time independent of the state size. It is also proven that constant-time-maintainable BCNF database schemes are bounded. In particular, it is shown that total projections of the representative instance can be computed via unions of projections of extension joins. Throughout we assume that database schemes are cover embedding and BCNF, and that functional dependencies are given in the form of key dependencies.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Software --- Operating Systems --- File Systems Management (D.4.3): {\bf Maintenance**}; Theory of Computation --- Mathematical Logic and Formal Languages --- Formal Languages (F.4.3): {\bf Classes defined by grammars or automata}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Normal forms}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}", } @InProceedings{Lanin:1988:CSM, author = "Vladimir Lanin and Dennis Shasha", title = "Concurrent set manipulation without locking", crossref = "ACM:1988:PPS", pages = "211--220", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p211-lanin/p211-lanin.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p211-lanin/", abstract = "Set manipulation consists of the actions {\em insert, delete}, and {\em member\/} on keys. We propose a concurrent set manipulation algorithm that uses no locking at all and requires no aborts, relying instead on atomic read-modify-write operations on single (data) locations. The algorithm satisfies order-preserving serializability through conditions that are strictly looser than existing algorithms", acknowledgement = ack-nhfb, } @InProceedings{Leuchner:1988:PTA, author = "J. Leuchner and L. Miller and G. Slutzki", title = "A polynomial time algorithm for testing implications of a join dependency and embodied functional dependencies", crossref = "ACM:1988:PAC", pages = "218--224", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p218-leuchner/p218-leuchner.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p218-leuchner/", abstract = "The problem of deciding whether a full join dependency (JD) [ {$R$} ] and a set of functional dependencies (FDs) {$F$} imply an embedded join dependency (EJD) [ {$S$} ] is known to be NP-complete. We show that the problem can be decided in polynomial time if {$S$} {$R$} and {$F$} is embedded in {\em R}. Our work uses arguments based on an extension of complete intersection graphs rather than tableaus. This approach has facilitated our results and should prove useful for future research.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Theory", subject = "Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Numerical Algorithms and Problems (F.2.1): {\bf Computations on polynomials}; Theory of Computation --- Mathematical Logic and Formal Languages --- Formal Languages (F.4.3): {\bf Classes defined by grammars or automata}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Schema and subschema}", } @InProceedings{VanGelder:1988:USW, author = "Allen {Van Gelder} and Kenneth Ross and John S. Schlipf", title = "Unfounded sets and well-founded semantics for general logic programs", crossref = "ACM:1988:PPS", pages = "221--230", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p221-van_gelder/p221-van_gelder.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p221-van_gelder/", abstract = "A general logic program (abbreviated to ``program'' hereafter) is a set of rules that have both positive and negative subgoals. It is common to view a deductive database as a general logic program consisting of rules (IDB) sitting above elementary relations (EDB, facts). It is desirable to associate one Herbrand model with a program and think of that model as the ``meaning of the program,'' or its ``declarative semantics.'' Ideally, queries directed to the program would be answered in accordance with this model. We introduce {\em unfounded sets\/} and {\em well-founded partial models}, and define the well-founded semantics of a program to be its well-founded partial model. If the well-founded partial model is in fact a model, we call it the {\em well-founded\/} model, and say the program is ``well-behaved''. We show that the class of well-behaved programs properly includes previously studied classes of ``stratified'' and ``locally stratified'' programs Gelfand and Lifschits have proposed a definition of ``unique stable model'' for general logic programs. We show that a program has a unique stable model if it has a well-founded model, in which case they are the same. We discuss why the converse is not true.", acknowledgement = ack-nhfb, } @InProceedings{Gyssens:1988:PAR, author = "Marc Gyssens and Dirk van Gucht", title = "The powerset algebra as a result of adding programming constructs to the nested relational algebra", crossref = "ACM:1988:PAC", pages = "225--232", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p225-gyssens/p225-gyssens.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p225-gyssens/", abstract = "In this paper, we discuss augmentations of the nested relational algebra with programming constructs, such as while-loops and for-loops. We show that the algebras obtained in this way are equivalent to a slight extension of the powerset algebra, thus emphasizing both the strength and the naturalness of the powerset algebra as a tool to manipulate nested relations, and, at the same time, indicating more direct ways to implement this algebra.", acknowledgement = ack-nhfb, generalterms = "Languages; Theory", subject = "Theory of Computation --- Logics and Meanings of Programs --- Studies of Program Constructs (F.3.3); Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Kolaitis:1988:WNF, author = "Phokion G. Kolaitis and Christos H. Papadimitriou", title = "Why not negation by fixpoint?", crossref = "ACM:1988:PPS", pages = "231--239", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p231-kolaitis/p231-kolaitis.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p231-kolaitis/", abstract = "{\em There is a fixpoint semantics for DATALOG programs with negation that is a natural generalization of the standard semantics for DATALOG programs without negation. We show that, unfortunately, several compelling complexity-theoretic obstacles rule out its efficient implementation. As an alternative, we propose Inflationary DATALOG, an efficiently implementable semantics for negation, based on inflationary fixpoints\/}", acknowledgement = ack-nhfb, } @InProceedings{Mazumdar:1988:RTB, author = "Subhasish Mazumdar and David Stemple and Tim Sheard", title = "Resolving the tension between integrity and security using a theorem prover", crossref = "ACM:1988:PAC", pages = "233--242", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p233-mazumdar/p233-mazumdar.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p233-mazumdar/", abstract = "Some information in databases and knowledge bases often needs to be protected from disclosure to certain users. Traditional solutions involving multi-level mechanisms are threatened by the user's ability to infer higher level information from the semantics of the application. We concentrate on the revelation of secrets through a user running transactions in the presence of database integrity constraints. We develop a method of specifying secrets formally that not only exposes a useful structure and equivalence among secrets but also allows a theorem prover to detect certain security lapses during transaction compilation time.", acknowledgement = ack-nhfb, generalterms = "Design; Security; Verification", subject = "Information Systems --- Database Management --- General (H.2.0): {\bf Security, integrity, and protection**}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Abiteboul:1988:PDD, author = "Serge Abiteboul and Victor Vianu", title = "Procedural and declarative database update languages", crossref = "ACM:1988:PPS", pages = "240--250", year = "1988", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p240-abiteboul/p240-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p240-abiteboul/", acknowledgement = ack-nhfb, } @InProceedings{Qian:1988:TLD, author = "Xiaolei Qian and Richard Waldinger", title = "A transaction logic for database specification", crossref = "ACM:1988:PAC", pages = "243--250", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p243-qian/p243-qian.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p243-qian/", abstract = "We introduce a logical formalism for the specification of the dynamic behavior of databases. The evolution of databases is characterized by both the dynamic integrity constraints which describe the properties of state transitions and the transactions whose executions lead to state transitions. Our formalism is based on a variant of first-order situational logic in which the states of computations are explicit objects. Integrity constraints and transactions are uniformly specifiable as expressions in our language. We also point out the application of the formalism to the verification and synthesis of transactions.", acknowledgement = ack-nhfb, generalterms = "Design; Verification", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3)", } @InProceedings{Gadia:1988:GMR, author = "Shashi K. Gadia and Chuen-Sing Yeung", title = "A generalized model for a relational temporal database", crossref = "ACM:1988:PAC", pages = "251--259", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p251-gadia/p251-gadia.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p251-gadia/", abstract = "We propose a generalized relational model for a temporal database which allows time stamping with respect to a Boolean algebra of multidimensional time stamps. The interplay between the various temporal dimensions is symmetric. As an application, a two dimensional model which allows objects with real world and transaction oriented time stamps is discussed. The two dimensional model can be used to query the past states of the database. It can also be used to give a precise classification of the errors and updates in a database, and is a promising approach for querying these errors and updates.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Computing Methodologies --- Simulation and Modeling --- Applications (I.6.3); Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Naqvi:1988:DUL, author = "Shamim Naqvi and Ravi Krishnamurthy", title = "Database updates in logic programming", crossref = "ACM:1988:PPS", pages = "251--262", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p251-naqvi/p251-naqvi.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p251-naqvi/", abstract = "{\em The need for control in logic programs is now being recognized. This is particularly evident when one focuses on allowing updates in logic programs. In this paper we propose a language DatalogA which is an extension of Datalog with updates to base relations. We define some procedural constructs to allow update programs to be written in an easy manner. The (W,p) scheme of Dynamic Logic fits nicely into the semantics of DatalogA programs in which W is taken to be the set of all possible states of the program and p is the accessibility relation between states. We give declarative semantics and equivalent constructed model semantics for DatalogA programs. We show that in the absence of updates our semantics reduce to the classical semantics of Datalog. Finally, we show some examples of non-stratified programs expressed in DatalogA}.", acknowledgement = ack-nhfb, } @InProceedings{Peinl:1988:HCS, author = "Peter Peinl and Andreas Reuter and Harald Sammer", title = "High contention in a stock trading database: a case study", crossref = "ACM:1988:PAC", pages = "260--268", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p260-peinl/p260-peinl.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p260-peinl/", abstract = "Though in general, current database systems adequately support application development and operation for online transaction processing (OLTP), increasing complexity of applications and throughput requirements reveal a number of weaknesses with respect to the data model and implementation techniques used. By presenting the experiences gained from a case study of a large, high volume stock trading system, representative for a broad class of OLTP applications, it is shown, that this particularly holds for dealing with high frequency access to a small number of data elements (hot spots). As a result, we propose extended data types and several novel mechanisms, which are easy to use and highly increase the expressional power of transaction oriented programming, that effectively cope with hot spots. Moreover, their usefulness and their ability to increased parallelism is exemplified by the stock trading application.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Management", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computer Applications --- Administrative Data Processing (J.1): {\bf Financial}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Computing Methodologies --- Simulation and Modeling --- Applications (I.6.3); Computing Milieux --- Management of Computing and Information Systems --- Project and People Management (K.6.1): {\bf Systems analysis and design}; Computing Methodologies --- Simulation and Modeling --- Model Validation and Analysis (I.6.4)", } @InProceedings{Muralikrishna:1988:OMR, author = "M. Muralikrishna and David J. DeWitt", title = "Optimization of multiple-relation multiple-disjunct queries", crossref = "ACM:1988:PPS", pages = "263--275", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p263-muralikrishna/p263-muralikrishna.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p263-muralikrishna/", abstract = "In this paper we discuss the optimization of multiple-relation multiple-disjunct queries in a relational database system. Since optimization techniques for conjunctive (single disjunct) queries in relational databases are well known [Smith75, Wong76, Selinger79, Yao79, Youssefi79], the natural way to evaluate a multiple-disjunct query was to execute each disjunct independently [Bernstein81, Kerschberg82] However, evaluating each disjunct independently may be very inefficient. In this paper, we develop methods that merge two or more disjuncts to form a term. The advantage of merging disjuncts to form terms lies in the fact that each term can be evaluated with a single scan of each relation that is present in the term. In addition, the number of times a join is performed will also be reduced when two or more disjuncts are merged. The criteria for merging a set of disjuncts will be presented. As we will see, the number of times each relation in the query is scanned will be equal to the number of terms. Thus, minimizing the number of terms will minimize the number of scans for each relation. We will formulate the problem of minimizing the number of scans as one of covering a merge graph by a minimum number of complete merge graphs which are a restricted class of Cartesian product graphs. In general, the problem of minimizing the number of scans is NP-complete. We present polynomial time algorithms for special classes of merge graphs. We also present a heuristic for general merge graphs. \par Throughout this paper, we will assume that no relations have any indices on them and that we are only concerned with reducing the number of scans for each relation present in the query. What about relations that have indices on them? It turns out that our performance metric of reducing the number of scans is beneficial even in the case that there are indices. In [Muralikrishna88] we demonstrate that when optimizing single-relation multiple-disjunct queries, the cost (measured in terms of disk accesses) may be reduced if all the disjuncts are optimized together rather than individually. Thus, our algorithm for minimizing the number of terms is also very beneficial in cases where indices exist", acknowledgement = ack-nhfb, } @InProceedings{Haynie:1988:DLD, author = "M. Haynie", title = "A {DBMS} for large design automation databases", crossref = "ACM:1988:PAC", pages = "269--276", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p269-haynie/p269-haynie.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p269-haynie/", abstract = "Large capacity Design Automation (CAD/CAM) database management systems require special capabilities over and above what commercial DBMSs or small workstation-based CAD/CAM systems provide. This paper describes one such system, Tacoma, used at Amdahl Corporation for the storage and retrieval of LSI and VLSI mainframe computer designs Tacoma is based on the relational model with additional object-oriented database features.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Computer Applications --- Computer-Aided Engineering (J.6): {\bf Computer-aided design (CAD)}; Computer Systems Organization --- Computer System Implementation --- VLSI Systems (C.5.4); Computer Systems Organization --- Computer System Implementation --- Large and Medium (``Mainframe'') Computers (C.5.1); Software --- Operating Systems --- General (D.4.0): {\bf UNIX}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Hou:1988:SER, author = "Wen-Chi Hou and Gultekin Ozsoyoglu and Baldeo K. Taneja", title = "Statistical estimators for relational algebra expressions", crossref = "ACM:1988:PPS", pages = "276--287", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p276-hou/p276-hou.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p276-hou/", abstract = "Present database systems process all the data related to a query before giving out responses. As a result, the size of the data to be processed becomes excessive for real-time/time-constrained environments. A new methodology is needed to cut down systematically the time to process the data involved in processing the query. To this end, we propose to use data samples and construct an approximate synthetic response to a given query. \par In this paper, we consider only COUNT(E) type queries, where E is an arbitrary relational algebra expression. We make no assumptions about the distribution of attribute values and ordering of tuples in the input relations, and propose consistent and unbiased estimators for arbitrary COUNT(E) type queries. We design a sampling plan based on the cluster sampling method to improve the utilization of sampled data and to reduce the cost of sampling. We also evaluate the performance of the proposed estimators.", acknowledgement = ack-nhfb, } @InProceedings{Bell:1988:SDM, author = "Jean L. Bell", title = "A specialized data management system for parallel execution of particle physics codes", crossref = "ACM:1988:PAC", pages = "277--285", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p277-bell/p277-bell.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p277-bell/", abstract = "The specialized data management system described in this paper was motivated by the need for much more efficient data management than a standard database management system could provide for particle physics codes in shared memory multiprocessor environments. The special characteristics of data and access patterns in particle physics codes need to be fully exploited in order to effect efficient data management. The data management system allows parameteric user control over system features not usually available to them, especially details of physical design and retrieval such as horizontal clustering, asynchronous I/O, and automatic distribution across processors. In the past, each physics code has constructed the equivalent of a primitive data management system from scratch. The system described in this paper is a generic system that can now be interfaced with a variety of physics codes.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Computer Applications --- Physical Sciences and Engineering (J.2): {\bf Physics}; Computing Methodologies --- Simulation and Modeling --- Applications (I.6.3); Computer Systems Organization --- Processor Architectures --- Multiple Data Stream Architectures (Multiprocessors) (C.1.2): {\bf Parallel processors**}; Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Access methods}", } @InProceedings{Christodoulakis:1988:PAF, author = "Stavros Christodoulakis and Daniel Alexander Ford", title = "Performance analysis and fundamental performance tradeoffs for {CLV} optical disks", crossref = "ACM:1988:PAC", pages = "286--294", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p286-christodoulakis/p286-christodoulakis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p286-christodoulakis/", abstract = "CLV type optical disks is a very large and important class of optical disk technology, of which CD-ROM disks form a subclass. \par In this paper we present a model of retrieval from CLV optical disks. We then provide exact and approximate results analyzing the retrieval performance from them. Our analysis takes into account disks with and without a mirror in the read mechanism, small objects completely placed within block boundaries, placement that allows block boundary crossing, as well as very large objects (such as documents) placed within files. \par In the second part of the paper we describe some fundamental implications of physical data base design for data bases stored on CLV optical disks. We show that very significant performance gains may be realized by appropriate design.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Computing Methodologies --- Simulation and Modeling --- Applications (I.6.3); Computing Methodologies --- Simulation and Modeling --- Model Validation and Analysis (I.6.4); Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Retrieval models}; Information Systems --- Database Management --- Physical Design (H.2.2); Hardware --- Memory Structures --- Design Styles (B.3.2): {\bf Mass storage}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Search process}", } @InProceedings{Huang:1988:SSM, author = "Bing-Chao Huang and Michael A. Langston", title = "Stable set and multiset operations in optimal time and space", crossref = "ACM:1988:PPS", pages = "288--293", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p288-huang/p288-huang.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p288-huang/", abstract = "The focus of this paper is on demonstrating the existence of methods for stably performing set and multiset operations on sorted files of data in both optimal time and optimal extra space. It is already known that stable merging and stable duplicate-key extraction permit such methods. The major new results reported herein are these \par an asymptotically optimal time and space algorithm is devised for stably selecting matched records from a sorted file, \par this selection strategy is employed, along with other algorithmic tools, to prove that all of the elementary binary set operations can be stably performed in optimal time and space on sorted files, and \par after generalizing these operations to multisets in a natural way for file processing, it is proved that each can be stably performed in optimal time and space on sorted files \par ", acknowledgement = ack-nhfb, } @InProceedings{Yu:1988:MTS, author = "Lin Yu and Daniel J. Rosenkrantz", title = "Minimizing time-space cost for database version control", crossref = "ACM:1988:PPS", pages = "294--301", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p294-yu/p294-yu.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p294-yu/", abstract = "We introduce the concept of a version graph to model the problem of minimising the space and version regeneration cost for database version control. We show that, in general, this problem and several of its variations are NP-complete. Motivated by the practical importance of these problems, we develop several heuristics and obtain worst-case guarantees on their performance. We also present linear time algorithms for problems characterized by special classes of version graphs.", acknowledgement = ack-nhfb, } @InProceedings{Hanson:1988:PQA, author = "Eric N. Hanson", title = "Processing queries aganist database procedures: a performance analysis", crossref = "ACM:1988:PAC", pages = "295--302", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p295-hanson/p295-hanson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p295-hanson/", abstract = "A database procedure is a collection of queries stored in the database. Several methods are possible for processing queries that retrieve the value returned by a database procedure. The conventional algorithm is to execute the queries in a procedure whenever it is accessed. A second strategy requires caching the previous value returned by the database procedure. If the cached value is valid at the time of a query, the value is returned immediately. If the cached value has been invalidated by an update, the value is recomputed, stored back into the cache, and then returned. A third strategy uses a differential view maintenance algorithm to maintain an up-to-date copy of the value returned by the procedure. This paper compares the performance of these three alternatives. The results show that which algorithm is preferred depends heavily on the database environment, particularly, the frequency of updates and the size of objects retrieved by database procedures.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Economics; Languages; Management; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Computing Methodologies --- Simulation and Modeling --- Applications (I.6.3); Computing Milieux --- Management of Computing and Information Systems --- Installation Management (K.6.2): {\bf Pricing and resource allocation}", } @InProceedings{Reiter:1988:WSD, author = "Raymond Reiter", title = "What should a database know?", crossref = "ACM:1988:PPS", pages = "302--304", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p302-reiter/p302-reiter.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p302-reiter/", abstract = "The by now conventional perspective on databases, especially deductive databases, is that they are sets of first order sentences. As such, they can be said to be claims about the truths of some {\em external\/} world, the database is a symbolic representation of that world. \par While agreeing with this account of what a database is, I disagree with how, both in theory and practice, a database is {\em used}, specifically how it is queried and how its integrity is enforced. \par Virtually all approaches to database query evaluation treat queries as first order formulas, usually with free variables whose bindings resulting from the evaluation phase define the answers to the query. The sole exception to this is the work of Levesque (1981, 1984), who argues that queries should be formulas in an epistemic modal logic. Queries, in other words, should be permitted to address aspects of the external world as represented in the database, as well as aspects of the database itself i.e., aspects of what the database {\em knows}. To take a simple example, suppose {\em DB = p y q\/} \par Query $p$ (i.e., is $p$ true in the external world?) \par Answer unknown \par Query {\em Kp\/} (i e. do you know whether $p$ is true in the external world?) \par Answer no \par Levesque's modal logic (called KFOPCE) distinguishes between known and unknown individuals in the database and thus accounts for ``regular'' database values as well as null values. For example, if {\em KB\/} is \par {Teach (John, Math100), ($x$) Teach ({\em x}, CS100), Teach (Mary, Psych100) y Teach (Sue, Psych100)}, \par then \par Query ($x$) {$K$} Teach (John, $x$) i.e., is there a known course which John teaches? \par Answer yes-Math100 \par Query ($x$) {$K$} Teach ({\em x}, CS100) i e is there a known teacher for CS100? \par Answer No \par Query ($x$) Teach ({\em x}, Psych100) i.e., does anyone teach Psych 100? \par Answer: Yes - Mary or Sue \par Query ($x$) {$K$} Teach ({\em x}, Psych100) i.e., is there a known teacher of Psych100? \par Answer No \par Levesque (1981, 1984) provides a semantics for his language KFOPCE FOPCE, is the first order language KFOPCE without the modal K Levesque proposes that a database is best viewed as a set of FOPCE sentences, and that it be queried by sentences of KFOPCE. He further provides a (noneffective) way of answering database queries. \par Recently I have considered the concept of a static integrity constraint in the context of Levesque's KFOPCE (Reiter 1988). The conventional view of integrity constraints is that, like the database itself, they too are first order formulas (e.g., Lloyd Topor (1985), Nicolas Yazdanian (1978), Reiter (1984)). There are two definitions in the literature of a deductive database {\em KB\/} satisfying an integrity constraint {\em IC}. \par {\em Definition 1\/} Consistency (e.g., Kowalski (1978), Sadri and Kowalski (1987)) {\em KB satisfies IC if f KB + IC is satisfiable\/} \par {\em Definition 2\/} Entailment (e.g., Lloyd and Topor (1985), Reiter (1984)) {\em KB satisfies IC if f KB @@@@ IC\/} \par Alas, neither definition seems correct. Consider a constraint requiring that employees have social security numbers (V $x$) {\em emp\/} ($x$ ) ($y$) {\em ss\#\/} ({\em x y\/}) (1) \par 1 Suppose {\em KB\/} = {emp (Mary)} Then {\em KB + IC\/} is satisfiable. But intuitively, we want the constraint to require {\em KB\/} to contain a ss\# ent", acknowledgement = ack-nhfb, } @InProceedings{Jarke:1988:MKA, author = "Matthias Jarke and Thomas Rose", title = "Managing knowledge about information system evolution", crossref = "ACM:1988:PAC", pages = "303--311", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p303-jarke/p303-jarke.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p303-jarke/", abstract = "This paper describes the design and initial prototype implementation of a knowledge base management system (KBMS) for controlling database software development and maintenance. The KBMS employs a version of the conceptual modelling language CML to represent knowledge about the tool-aided development process of an information system from requirements analysis to conceptual design to implementation, together with the relationship of these system components to the real-world environment in which the information system is intended to function. A decision-centered documentation methodology facilitates communication across time and among multiple developers (and possibly users), thus enabling improved maintenance support.", acknowledgement = ack-nhfb, generalterms = "Design; Documentation; Management", subject = "Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Representations (procedural and rule-based)}; Computing Milieux --- Management of Computing and Information Systems --- Software Management (K.6.3): {\bf Software maintenance}; Software --- Software Engineering --- Design** (D.2.10): {\bf Representation**}; Computing Milieux --- Management of Computing and Information Systems --- Software Management (K.6.3): {\bf Software development}; Computing Milieux --- Management of Computing and Information Systems --- Project and People Management (K.6.1): {\bf Systems development}", } @InProceedings{Buneman:1988:SCO, author = "Peter Buneman and Susan Davidson and Aaron Watters", title = "A semantics for complex objects and approximate queries", crossref = "ACM:1988:PPS", pages = "305--314", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p305-buneman/p305-buneman.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p305-buneman/", abstract = "A new definition of complex objects is introduced which provides a denotation for incomplete tuples as well as partially described sets. Set values are ``sandwiched'' between ``complete'' and ``consistent'' descriptions (representing the Smyth and Hoare powerdomains respectively), allowing the maximal values to be arbitrary subsets of maximal elements in the domain of the set. We also examine the use of rules in defining queries over such objects.", acknowledgement = ack-nhfb, } @InProceedings{Naughton:1988:CSR, author = "Jeffrey F. Naughton", title = "Compiling separable recursions", crossref = "ACM:1988:PAC", pages = "312--319", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p312-naughton/p312-naughton.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p312-naughton/", abstract = "In this paper we consider evaluating queries on relations defined by a combination of recursive rules. We first define separable recursions. We then give a specialized algorithm for evaluating selections on separable recursions. Like the Generalized Magic Sets and Generalized Counting algorithms, thus algorithm uses selection constants to avoid examining irrelevant portions of the database, however, on some simple recursions this algorithm is $O(n)$, whereas Generalized Magic Sets is $O(n^2)$ and Generalized Counting is $O(2^n)$", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}", } @InProceedings{Winslett:1988:FCU, author = "Marianne Winslett", title = "A framework for comparison of update semantics", crossref = "ACM:1988:PPS", pages = "315--324", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p315-winslett/p315-winslett.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p315-winslett/", abstract = "Scattered across the scientific literature of three or more disciplines appears a profusion of proposals for semantics of updates to logical theories. Because no previous work has compared these proposals with one another, the merits and demerits of the various approaches are not well known. Since the semantics differ from one another in systematic ways, it is possible to generalize from existing proposals and speak of the properties of {\em classes\/} of update semantics. In this paper we suggest a two-dimensional taxonomy for characterizing semantics, and describe the properties inherent to the classes implicit therein. Our discussion includes measurement of the computational complexity of the different classes.", acknowledgement = ack-nhfb, } @InProceedings{Youn:1988:CRF, author = "Cheong Youn and Lawrence J. Henschen and Jiawei Han", title = "Classification of recursive formulas in deductive databases", crossref = "ACM:1988:PAC", pages = "320--328", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p320-youn/p320-youn.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p320-youn/", abstract = "In this paper, we present results on the classification of linear recursive formulas in deductive databases and apply those results to the compilation and optimization of recursive queries. We also introduce compiled formulas and query evaluation plans for a representative query for each of these classes. \par To explain general recursive formulas, we use a graph model that shows the connectivity between variables. The connecticity between variables is the most critical part in processing recursive formulas. We demonstrate that based on such a graph model all the linear recursive formulas can be classified into several classes and each class shares some common characteristics in compilation and query processing. The compiled formulas and the corresponding query evaluation plans can be derived based on the study of the compilation of each class.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Recursive function theory}", } @InProceedings{Sippu:1988:GTC, author = "Seppo Sippu and Eljas Soisalon-Soininen", title = "A generalized transitive closure for relational queries", crossref = "ACM:1988:PPS", pages = "325--332", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p325-sippu/p325-sippu.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p325-sippu/", abstract = "We augment relational algebra with a generalized transitive closure operator that allows for the efficient evaluation of a subclass of recursive queries. The operator is based on a composition operator which is as general as possible when the operator is required to be associative and when only relational algebra operators are used in its definition. The closure of such a composition can be computed using the well-known efficient algorithms designed for the computation of the usual transitive closure. Besides the case in which complete materialization of recursive relations are required, our strategy also yields an efficient solution in the case in which a selection is applied to the closure.", acknowledgement = ack-nhfb, } @InProceedings{Wolfson:1988:DPL, author = "Ouri Wolfson and Avi Silberschatz", title = "Distributed processing of logic programs", crossref = "ACM:1988:PAC", pages = "329--336", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p329-wolfson/p329-wolfson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p329-wolfson/", abstract = "This paper is concerned with the issue of parallel evaluation of logic programs. To address this issue we define a new concept of {\em predicate decomposability}. If a predicate is decomposable, it means that the load of evaluating it can be divided among a number of processors, without a need for communication among them. This in turn results in a very significant speed-up of the evaluation process. \par We completely characterize three classes of single rule programs (sirups) with respect to decomposability nonrecursive, linear, and simple chain programs. All three classes were studied previously in various contexts. We establish that nonrecursive programs are decomposable, whereas for the other two classes we determine which ones are, and which ones are not decomposable. We also establish two sufficient conditions for sirup decomposability.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}", } @InProceedings{Haddad:1988:CMC, author = "Ramsey W. Haddad and Jeffrey F. Naughton", title = "Counting methods for cyclic relations", crossref = "ACM:1988:PPS", pages = "333--340", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p333-haddad/p333-haddad.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p333-haddad/", abstract = "In this paper we consider selections of the form ``column = constant'' on relations defined by linear recursive, two rule datalog programs. In general, counting methods perform well on such queries. However, counting methods fail in the presence of cycles in the database. We present an algorithm in the spirit of counting methods that correctly deals with cyclic data and has the same asymptotic running time as counting methods. The algorithm, which is based on reducing a query on a database to a question about intersections of semi-linear sets, works by using efficient methods to construct the appropriate semi-linear sets from the database and query constant.", acknowledgement = ack-nhfb, } @InProceedings{Group:1988:BNS, author = "{Tandem Performance Group}", title = "A benchmark of non-stop {SQL} on the debit credit transaction", crossref = "ACM:1988:PAC", pages = "337--341", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/citations/proceedings/mod/50202/p337-tandem_performance_group/", abstract = "NonStop SQL is an implementation of ANSI SQL on Tandem Computer Systems Debit Credit is a widely used industry-standard transaction. This paper summarizes a benchmark of NonStop SQL which demonstrated linear growth of throughout from 14 to 208 Debit Credit transactions per second as the hardware grew from 2 to 32 processors. The benchmark also compared the performance of NonStop SQL to the performance of a record-at a time file system interface", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Management; Performance", subject = "Computer Systems Organization --- Performance of Systems (C.4): {\bf Performance attributes}; Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}; Computing Milieux --- Management of Computing and Information Systems --- Installation Management (K.6.2): {\bf Benchmarks}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Measurement techniques}", } @InProceedings{Vardi:1988:DUR, author = "Moshe Y. Vardi", title = "Decidability and undecidability results for boundedness of linear recursive queries", crossref = "ACM:1988:PPS", pages = "341--351", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/308386/p341-vardi/p341-vardi.pdf; http://www.acm.org/pubs/citations/proceedings/pods/308386/p341-vardi/", abstract = "If it is possible to eliminate recursion from a Datalog program {\em P}, then {$P$} is said to be {\em bounded}. It was shown by Gaifman et al that the problem of deciding whether a given Datalog program is bounded is undecidable, even for linear programs that has one {\em 4-ary\/} intensional predicate. We sharpen that result by showing that the problem of deciding whether a given Datalog program is bounded is undecidable, even for linear programs that has one {\em binary\/} intensional predicate. We then consider linear programs with a single recursive rule. We show that if the intensional predicate is binary, then the boundedness problem for such program is decidable, in fact, it is NP-complete.", acknowledgement = ack-nhfb, } @InProceedings{Borr:1988:HPS, author = "A. Borr", title = "High performance {SQL} through low-level system integration", crossref = "ACM:1988:PAC", pages = "342--349", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p342-borr/p342-borr.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p342-borr/", abstract = "NonStop SQL [TM] achieves high performance through an implementation which integrates SQL record access with the pre-existing disk I/O and transaction management subsystems, and moves SQL function downward from the client to the server level of these subsystems. System integration and movement of function to the server reduce message traffic and CPU consumption by putting SQL optimizations at the lower levels of the system. Examples of such optimizations are message traffic savings by filtering data and applying updates at the data source, I/O savings by SQL-optimized buffer pool management, and locking and transaction journaling techniques which take advantage of SQL semantics. Achieving message traffic reduction is particularly important in a distributed, non shared-memory architecture such as the Tandem NonStop System. The result of this implementation is an SQL system which matches the performance of the pre-existing DBMS, while inheriting such pre-existing architecturally-derived features as high availability, transaction-based data integrity, and distribution of both data and execution.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Performance attributes}; Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}", } @InProceedings{DeWitt:1988:PAG, author = "D. J. DeWitt and S. Ghandeharizadeh and D. Schneider", title = "A performance analysis of the gamma database machine", crossref = "ACM:1988:PAC", pages = "350--360", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p350-dewitt/p350-dewitt.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p350-dewitt/", abstract = "This paper presents the results of an initial performance evaluation of the Gamma database machine. In our experiments we measured the effect of relation size and indices on response time for selection, join, and aggregation queries, and single-tuple updates. A Teradata DBC/1012 database machine of similar size is used as a basis for interpreting the results obtained. We also analyze the performance of Gemma relative to the number of processors employed and study the impact of varying the memory size and disk page size on the execution time of a variety of selection and join queries. We analyze and interpret the results of these experiments based on our understanding of the system hardware and software, and conclude with an assessment of the strengths and weaknesses of Gamma.", acknowledgement = ack-nhfb, generalterms = "Design; Management; Performance", subject = "Computer Systems Organization --- Performance of Systems (C.4): {\bf Measurement techniques}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Performance attributes}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Computing Milieux --- Management of Computing and Information Systems --- Installation Management (K.6.2): {\bf Benchmarks}", xxauthor = "D. J. DeWitt and S. Ghanderaizadeh and D. Schneider", } @InProceedings{Roesler:1988:SLM, author = "M. Roesler and W. A. Burkhard", title = "Semantic lock models in object-oriented distributed systems and deadlock resolution", crossref = "ACM:1988:PAC", pages = "361--370", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p361-roesler/p361-roesler.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p361-roesler/", abstract = "{\em We propose a distributed algorithm for detection and resolution of resource deadlocks in object-oriented distributed systems. The algorithm proposed is shown to detect and resolve all O(n 1) cycles present in the worst case waits-for-graph (WFG) with n vertices by transmitting O(n 3) messages of small constant size. Its average time complexity has been shown to be O(ne), where e is the number of edges in the WFG After deadlock resolution, the algorithm leaves information in the system concerning dependence relations of running transactions. This information will preclude the wasteful retransmission of messages and reduce the delay in detecting future deadlocks}.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Deadlock avoidance}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Theory of Computation --- Computation by Abstract Devices --- Models of Computation (F.1.1): {\bf Computability theory}", } @InProceedings{Ramarao:1988:CPD, author = "K. V. S. Ramarao", title = "Commitment in a partitioned distributed database", crossref = "ACM:1988:PAC", pages = "371--378", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p371-ramarao/p371-ramarao.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p371-ramarao/", abstract = "Network partition is among the hardest failure types in a distributed system even if all processors and links are of {\em fail-stop\/} type. We address the transaction commitment problem in a partitioned distributed database. It is assumed that partitions are detectable. The approach taken is conservative - that is, the same transaction cannot be committed by one site and aborted by another. \par A new and very general formal model of protocols operating in a partitioned system is introduced and protocols more efficient than the existing ones are constructed.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}", } @InProceedings{Korth:1988:FMC, author = "H. K. Korth and G. Speegle", title = "Formal model of correctness without serializability", crossref = "ACM:1988:PAC", pages = "379--386", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p379-korth/p379-korth.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p379-korth/", abstract = "In the classical approach to transaction processing, a concurrent execution is considered to be correct if it is equivalent to a non-concurrent schedule. This notion of correctness is called {\em serializability}. Serializability has proven to be a highly useful concept for transaction systems for data-processing style applications. Recent interest in applying database concepts to applications in computer-aided design, office information systems, etc. has resulted in transactions of relatively long duration. For such transactions, there are serious consequences to requiring serializability as the notion of correctness. Specifically, such systems either impose long-duration waits or require the abortion of long transactions. In this paper, we define a transaction model that allows for several alternative notions of correctness without the requirement of serializability. After introducing the model, we investigate classes of schedules for transactions. We show that these classes are richer than analogous classes under the classical model. Finally, we show the potential practicality of our model by describing protocols that permit a transaction manager to allow correct non-serializable executions", acknowledgement = ack-nhfb, subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}", } @InProceedings{Ramnarayan:1988:DKB, author = "R. Ramnarayan and H. Lu", title = "A data\slash knowledge base management testbed and experimental results on data\slash knowledge base query and update processing", crossref = "ACM:1988:PAC", pages = "387--395", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p387-ramnarayan/p387-ramnarayan.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p387-ramnarayan/", abstract = "This paper presents our experience in designing and implementing a data/knowledge base management testbed. The testbed consists of two layers, the knowledge manager and the database management system, with the former at the top. The testbed is based on the logic programming paradigm, wherein data, knowledge, and queries are all expressed as Horn clauses. The knowledge manager compiles pure, function-free Horn clause queries into embedded-SQL programs, which are executed by the database management system to produce the query results. The database management system is a commercial relational database system and provides storage for both rules and facts. First, the testbed architecture and major data structures and algorithms are described. Then, several preliminary tests conducted using the current version of the testbed and the conclusions from the test results are presented. The principal contributions of this work have been to unify various concepts, both previously published and new ones we developed, into a real system and to present several insights into data/knowledge base management system design gleaned from the test results and our design and implementation experience.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}", } @InProceedings{Delcambre:1988:SCI, author = "L. M. L. Delcambre and J. N. Etheredge", title = "A self-controlling interpreter for the relational production language", crossref = "ACM:1988:PAC", pages = "396--403", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p396-delcambre/p396-delcambre.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p396-delcambre/", abstract = "The Relational Production Language (RPL) solves the paradigm mismatch between expert systems and database systems by relying on the relational data model as the underlying formalism for an expert system. The result is a formally-defined production system language with immediate access to conventional databases. Working memory is modeled as a relational database and rules consist of a relational query on the left hand side (LHS) and database updates on the right hand side (RHS). This paper reports on the design of the RPL 1 0 prototype. The prototype directly executes RPL programs and capitalizes on the inherent advantages of the relational approach, particularly for intra-rule and inter-rule parallelism. By using a self-describing approach for representing the interpreter data structures, the interpreter is a self-controlling system that allows conflict resolution, error handling and a wide spectrum of software metrics to be explicitly specified using RPL meta-rules.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Reliability", subject = "Software --- Programming Languages --- Processors (D.3.4): {\bf Interpreters}; Software --- Software Engineering --- Testing and Debugging (D.2.5): {\bf Error handling and recovery}; Software --- Software Engineering --- Requirements/Specifications (D.2.1): {\bf RPL}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Sellis:1988:ILP, author = "T. Sellis and C. C. Lin and L. Raschid", title = "Implementing large production systems in a {DBMS} environment: concepts and algorithms", crossref = "ACM:1988:PAC", pages = "404--423", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p404-sellis/p404-sellis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p404-sellis/", abstract = "It has been widely recognized that many future database applications, including engineering processes, manufacturing and communications, will require some kind of rule based reasoning. In this paper we study methods for storing and manipulating large rule bases using relational database management systems. First, we provide a matching algorithm which can be used to efficiently identify applicable rules. The second contribution of this paper, is our proposal for concurrent execution strategies which surpass, in terms of performance, the sequential OPS5 execution algorithm. The proposed method is fully parallelizable, which makes its use even more attractive, as it can be used in parallel computing environments.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Computing Methodologies --- Artificial Intelligence --- Applications and Expert Systems (I.2.1); Information Systems --- Information Storage and Retrieval --- Content Analysis and Indexing (H.3.1): {\bf Indexing methods}", } @InProceedings{Carey:1988:DMQ, author = "Michael J. Carey and David J. DeWitt", title = "A data model and query language for {EXODUS}", crossref = "ACM:1988:PAC", pages = "413--423", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p413-carey/p413-carey.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p413-carey/", abstract = "{\em In this paper, we present the design of the EXTRA data model and the EXCESS query language for the EXODUS extensible database system. The EXTRA data model includes support for complex objects with shared subobjects, a novel mix of object- and value-oriented semantics for data, support for persistent objects of any type in the EXTRA type lattice, and user-defined abstract data types (ADTs). The EXCESS query language provides facilities for querying and updating complex object structures, and it can be extended through the addition of ADT functions and operators, procedures and functions for manipulating EXTRA schema types, and generic set functions EXTRA and EXCESS are intended to serve as a test vehicle for tools developed under the EXODUS extensible database system project}.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Classifications (D.3.2): {\bf EXODUS}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}", } @InProceedings{Lecluse:1988:OOD, author = "C. Lecluse and P. Richard and F. Velez", title = "{$O_2$}, an object-oriented data model", crossref = "ACM:1988:PAC", pages = "424--433", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p424-lecluse/p424-lecluse.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p424-lecluse/", abstract = "The {\em Altair\/} group is currently designing an object-oriented data base system called O 2. This paper presents a formal description of the object-oriented data model of this system. It proposes a type system defined in the framework of a set-and-tuple data model. It models the well known inheritance mechanism and enforces strong typing.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Schema and subschema}", } @InProceedings{Borgida:1988:MCH, author = "A. Borgida", title = "Modeling class hierarchies with contradictions", crossref = "ACM:1988:PAC", pages = "434--443", year = "1988", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/50202/p434-borgida/p434-borgida.pdf; http://www.acm.org/pubs/citations/proceedings/mod/50202/p434-borgida/", abstract = "One characteristic feature of object-oriented systems and knowledge bases (semantic data models, conceptual modeling languages, Al frames) is that they offer as a basic paradigm the notion of objects grouped into classes, which are themselves organized in subclass hierarchies. Through ideas such as inheritance and bounded polymorphism, this feature supports the technique of ``{\em abstraction by generalization\/}'', which has been argued to be of importance in designing Information Systems [11, 2]. \par We provide in this paper examples demonstrating that in some applications {\em over-generalization\/} is likely to occur an occasional natural subclass may contradict in some way one if its superclass definitions, and thus turn out not to be a strict subtype of this superclass. A similar problem arises when an object is allowed to be a member of several classes which make incompatible predictions about its type. We argue that none of the previous approaches suggested to deal with such situations is entirely satisfactory. \par A language feature is therefore presented to permit class definitions which contradict aspects of other classes, such as superclasses, in an object-based language. In essence, the approach requires contradictions among class definitions to be {\em explicitly\/} acknowledged. We define a semantics of the resulting language, which restores the condition that subclasses are both subsets and subtypes, and deals correctly with the case when an object can belong to several classes. This is done by separating the notions of ``class'' and ``type'', and it allows query compilers to detect type errors as well as eliminate some run-time checks in queries, even in the presence of ``contradictory'' class definitions.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computing Methodologies --- Artificial Intelligence --- Applications and Expert Systems (I.2.1); Information Systems --- Database Management --- Languages (H.2.3): {\bf Data description languages (DDL)}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data manipulation languages (DML)}", } @InProceedings{VanGelder:1989:AFL, author = "A. {Van Gelder}", title = "The alternating fixpoint of logic programs with negation", crossref = "ACM:1989:PPE", pages = "1--10", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p1-van_gelder/p1-van_gelder.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p1-van_gelder/", abstract = "We introduce and describe the {\em alternating fixpoint\/} of a logic program with negation. The underlying idea is to monotonically build up a set of {\em negative\/} conclusions until the least fixpoint is reached, using a transformation related to the one that defines stable models, developed by Gelfand and Lifschitz. From a fixed set of negative conclusions, we can derive the positive conclusions that follow (without deriving any further negative ones), by traditional Horn clause semantics. The union of positive and negative conclusions is called the {\em alternating fixpoint partial model}. The name ``alternating'' was chosen because the transformation runs in two passes; the first pass transforms an underestimate of the set of negative conclusions into an (intermediate) overestimate; the second pass transforms the overestimates into a new underestimate; the composition of the two passes is monotonic. \par Our main theorem is that the alternating fixpoint partial model is exactly the well-founded partial model. \par We also show that a system is {\em fixpoint logic}, which permits rule bodies to be first order formulas but requires inductive relations to be positive within them, can be transformed straightforwardly into a normal logic program whose alternating fixpoint partial model corresponds to the least fixpoint of the fixpoint logic system. Thus alternating fixpoint logic is at least as expressive as fixpoint logic. The converse is shown to hold for finite structures.", acknowledgement = ack-nhfb, generalterms = "Design; Theory", keywords = "design; theory", subject = "Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Lambda calculus and related systems}; Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2)", } @InProceedings{Salza:1989:ESQ, author = "Silvio Salza and Mario Terranova", title = "Evaluating the size of queries on relational databases with non-uniform distribution and stochastic dependence", crossref = "Clifford:1989:PAS", pages = "8--14", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p8-salza/p8-salza.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p8-salza/", abstract = "{\em The paper deals with the problem of evaluating how the originality of the attributes of a relation, i.e., the number of distinct values in each attribute, is affected by relational operations that reduce the cardinality of the relation. This is indeed an interesting problem in research areas such as database design and query optimization. Some authors have shown that non uniform distributions and stochastic dependence significantly affect the originality of the attributes. Therefore the models that have been proposed in the literature, based on uniformity and independence assumptions, in several situation can not be conveniently utilized. In this paper we propose a probabilistic model that overcomes the need of the uniformity and independence assumptions. The model is exact for non uniform distributions when the attributes are independent, and gives approximate results when stochastic dependence is considered. In the latter case the analytical results have been compared with a simulation, and proved to be quite accurate}.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Theory of Computation --- Computation by Abstract Devices --- Modes of Computation (F.1.2): {\bf Probabilistic computation}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computing Methodologies --- Simulation and Modeling --- Applications (I.6.3)", } @InProceedings{Przymusinski:1989:ELP, author = "T. C. Przymusinski", title = "Every logic program has a natural stratification and an iterated least fixed point model", crossref = "ACM:1989:PPE", pages = "11--21", year = "1989", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p11-przymusinski/p11-przymusinski.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p11-przymusinski/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p11-przymusinski/", acknowledgement = ack-nhfb, keywords = "algorithms; design", subject = "{\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Nonmonotonic reasoning and belief revision.", } @InProceedings{Kolodner:1989:AGC, author = "Elliot Kolodner and Barbara Liskov and William Weihl", title = "Atomic garbage collection: managing a stable heap", crossref = "Clifford:1989:PAS", pages = "15--25", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p15-kolodner/p15-kolodner.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p15-kolodner/", abstract = "Modern database systems use transactions to achieve a high degree of fault-tolerance. Many modern programming languages and systems provide garbage collected heap storage, which frees the programmer from the job of explicitly deallocating storage. In this paper we describe integrated garbage collection and recovery algorithms for managing a {\em stable heap\/} in which accessible objects survive both system crashes and media failures. \par A garbage collector typically both moves and modifies objects which can lead to problems when the heap is stable because a system crash after the start of collection but before enough of the reorganized heap reaches the disk can leave the disk in an inconsistent state. Furthermore, collection has to be coordinated with the recovery system. We present a collection algorithm and recovery system that solves these problems.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Systems (H.2.4); Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Classifications (D.3.2): {\bf C++}", } @InProceedings{Ross:1989:PSW, author = "K. A. Ross", title = "A procedural semantics for well founded negation in logic programs", crossref = "ACM:1989:PPE", pages = "22--33", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p22-ross/p22-ross.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p22-ross/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p22-ross/", abstract = "We introduce global SLS-resolution, a procedural semantics for well-founded negation as defined by Van Gelder, Ross and Schlipf. Global SLS-resolution extends Prsymusinski's SLS-resolution, and may be applied to all programs, whether locally stratified or not. 1 Global SLS-resolution is defined in terms of global trees, a new data structure representing the dependence of goals on derived negative subgoals. We prove that global SLS-resolution is sound with respect to the well-founded semantics, and complete for non-floundering queries.", acknowledgement = ack-nhfb, generalterms = "Design; Theory", keywords = "design; theory", subject = "{\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf E.1} Data, DATA STRUCTURES, Trees.", } @InProceedings{Dong:1989:DPD, author = "Guozhu Dong", title = "On distributed processibility of datalog queries by decomposing databases", crossref = "Clifford:1989:PAS", pages = "26--35", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p26-dong/p26-dong.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p26-dong/", abstract = "We consider distributed or parallel processing of datalog queries. We address this issue by decomposing databases into a number of subdatabases such that the computation of a program on a database can be achieved by {\em unioning its independent evaluations\/} on the subdatabases. More specifically, we identify two kinds of distributed-processable programs according to the properties of database decomposition. (i) A program is {\em disjoint distributive\/} if it is distributed processable over a decomposition consisting of subdatabases with disjoint domains. A characterization of such programs is given in terms of an easily decidable syntactic property called {\em connectivity}. (ii) A program is {\em bounded distributive\/} if it is distributed processable over a decomposition consisting of subdatabases with a fixed size. Three interesting characterizations of such a program are presented, the first by bounded recursion, the second by equivalence to a 1-bounded-recursive program, and the third by constant parallel complexity", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Mathematics of Computing --- Numerical Analysis --- General (G.1.0): {\bf Parallel algorithms}; Software --- Programming Techniques --- Concurrent Programming (D.1.3); Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}", } @InProceedings{Bry:1989:LPC, author = "F. Bry", title = "Logic programming as constructivism: a formalization and its application to databases", crossref = "ACM:1989:PPE", pages = "34--50", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p34-bry/p34-bry.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p34-bry/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p34-bry/", abstract = "{\em The features of logic programming that seem unconventional from the viewpoint of classical logic can be explained in terms of constructivistic logic. We motivate and propose a constructivistic proof theory of non-Horn logic programming. Then, we apply this formalization for establishing results of practical interest. First, we show that `stratification' can be motivated in a simple and intuitive way. Relying on similar motivations, we introduce the larger classes of `loosely stratified' and `constructively consistent' programs. Second, we give a formal basis for introducing quantifiers into queries and logic programs by defining `constructively domain independent' formulas. Third, we extend the Generalized Magic Sets procedure to loosely stratified and constructively consistent programs, by relying on a `conditional fixpoint' procedure}.", acknowledgement = ack-nhfb, generalterms = "Design", keywords = "design", subject = "{\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf F.3.1} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Specifying and Verifying and Reasoning about Programs, Specification techniques.", } @InProceedings{Agrawal:1989:OOD, author = "R. Agrawal and N. H. Gehani", title = "{ODE (Object Database and Environment)}: the language and the data model", crossref = "Clifford:1989:PAS", pages = "36--45", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p36-agrawal/p36-agrawal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p36-agrawal/", abstract = "ODE is a database system and environment based on the object paradigm. It offers one integrated data model for both database and general purpose manipulation. The database is defined, queried and manipulated in the database programming language O++ which is based on C++. O++ borrows and extends the object definition facility of C++, called the class. Classes support data encapsulation and multiple inheritance. We provide facilities for creating persistent and versioned objects, defining sets, and iterating over sets and clusters of persistent objects. We also provide facilities to associate constraints and triggers with objects. This paper presents the linguistic facilities provided in O++ and the data model it supports.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Systems (H.2.4); Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Classifications (D.3.2): {\bf C++}", } @InProceedings{Ohori:1989:DPM, author = "Atsushi Ohori and Peter Buneman and Val Breazu-Tannen", title = "Database programming in {Machiavelli} --- a polymorphic language with static type inference", crossref = "Clifford:1989:PAS", pages = "46--57", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p46-ohori/p46-ohori.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p46-ohori/", abstract = "Machiavelli is a polymorphically typed programming language in the spirit of ML, but supports an extended method of type inferencing that makes its polymorphism more general and appropriate for database applications. In particular, a function that selects a field of a records is polymorphic in the sense that it can be applied to any record which contains a field with the appropriate type. When combined with a set data type and database operations including join and projection, this provides a natural medium for relational database programming. Moreover, by implementing database objects as reference types and generating the appropriate views -- sets of structures with ``identity'' -- we can achieve a degree of static type checking for object-oriented databases.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data manipulation languages (DML)}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data description languages (DDL)}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Imielinski:1989:CQP, author = "T. Imielinski and K. Vadaparty", title = "Complexity of query processing in databases with {OR-objects}", crossref = "ACM:1989:PPE", pages = "51--65", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p51-imielinski/p51-imielinski.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p51-imielinski/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p51-imielinski/", abstract = "If ground disjunctive facts are admitted into a database the data complexity of conjunctive queries grows from PTIME into CoNP with some simple examples of CoNP-Complete conjunctive queries. A natural question which arises in this context is whether it is possible to syntactically characterize those queries which are ``bad'' (i.e., CoNP-Complete) from those that are ``good'' (i.e., with PTIME data complexity) given a predefined ``pattern'' of disjunctions in the database. In this paper, we study the data complexity of conjunctive queries. We give a complete syntactic characterization of CoNP-Complete conjunctive queries for a class of disjunctive databases called OR-Databases. Our results can be used in complexity tailored design where design decisions are motivated by complexity of query processing. Also, we establish that a similar complete syntactic characterization for disjunctive queries, with negation allowed only on base predicates, would answer the open problem ``Does Graph Isomorphism belong to PTIME or is it NP-Complete?''.", acknowledgement = ack-nhfb, generalterms = "Design; Theory", keywords = "design; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf I.2.1} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Applications and Expert Systems. {\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General. {\bf F.1.3} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Complexity Measures and Classes, Reducibility and completeness.", } @InProceedings{Borgida:1989:CSD, author = "Alexander Borgida and Ronald J. Brachman and Deborah L. McGuinness and Lori Alperin Resnick", title = "{CLASSIC}: a structural data model for objects", crossref = "Clifford:1989:PAS", pages = "58--67", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p58-borgida/p58-borgida.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p58-borgida/", abstract = "CLASSIC is a data model that encourages the description of objects not only in terms of their relations to other known objects, but in terms of a level of intensional structure as well. The CLASSIC language of {\em structured descriptions\/} permits (i) partial descriptions of individuals, under an `open world' assumption, (ii) answers to queries either as extensional lists of values or as descriptions that necessarily hold of all possible answers, and (iii) an easily extensible schema, which can be accessed uniformly with the data. One of the strengths of the approach is that the same language plays multiple roles in the processes of defining and populating the DB, as well as querying and answering. \par CLASSIC (for which we have a prototype main-memory implementation) can actively discover new information about objects from several sources: it can recognize new classes under which an object falls based on a description of the object, it can propagate some deductive consequences of DB updates, it has simple procedural recognizers, and it supports a limited form of forward-chaining rules to derive new conclusions about known objects. \par The kind of language of descriptions and queries presented here provides a new arena for the search for languages that are more expressive than conventional DBMS languages, but for which query processing is still tractable. This space of languages differs from the subsets of predicate calculus hitherto explored by deductive databases.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Data manipulation languages (DML)}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data description languages (DDL)}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Yuan:1989:SCQ, author = "L. Y. Yuan and D.-A. Chiang", title = "A sound and complete query evaluation algorithm for relational databases with disjunctive information", crossref = "ACM:1989:PPE", pages = "66--74", year = "1989", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p66-yuan/p66-yuan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p66-yuan/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p66-yuan/", acknowledgement = ack-nhfb, keywords = "algorithms; design; languages; theory", subject = "{\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General. {\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages, Algebraic approaches to semantics. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Hou:1989:PAR, author = "Wen-Chi Hou and Gultekin Ozsoyoglu and Baldeo K. Taneja", title = "Processing aggregate relational queries with hard time constraints", crossref = "Clifford:1989:PAS", pages = "68--77", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p68-hou/p68-hou.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p68-hou/", abstract = "We consider those database environments in which queries have strict timing constraints, and develop a time-constrained query evaluation methodology. For aggregate relational algebra queries, we describe a time constrained query evaluation algorithm. The algorithm, which is implemented in our prototype DBMS, iteratively samples from input relations, and evaluates the associated estimators developed in our previous work, until a stopping criterion (e.g., a time quota or a desired error range) is satisfied. \par To determine sample sizes at each stage of the iteration (so that the time quota will not be overspent) we need to have (a) accurate sample selectivity estimations of the RA operators in the query, (b) precise time cost formulas, and (c) good time-control strategies. To estimate the sample selectivities of RA operators, we use a runtime sample selectivity estimation and improvement approach which is flexible. For query time estimations, we use time-cost formulas which are adaptive and precise. To use the time quota efficiently, we propose statistical and heuristic time-control strategies to control the risk of overspending the time quota. Preliminary evaluation of the implemented prototype is also presented.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data manipulation languages (DML)}; Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Semantic networks}", } @InProceedings{Grahne:1989:HTE, author = "G. Grahne", title = "Horn tables-an efficient tool for handling incomplete information in databases", crossref = "ACM:1989:PPE", pages = "75--82", year = "1989", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p75-grahne/p75-grahne.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p75-grahne/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p75-grahne/", acknowledgement = ack-nhfb, keywords = "design; theory", subject = "{\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages, Algebraic approaches to semantics. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Jagadish:1989:IHR, author = "H. V. Jagadish", title = "Incorporating hierarchy in a relational model of data", crossref = "Clifford:1989:PAS", pages = "78--87", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p78-jagadish/p78-jagadish.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p78-jagadish/", abstract = "We extend the relational model of data to allow classes as attribute values, thereby permitting the representation of hierarchies of objects. Inheritance, including multiple inheritance with exceptions, is clearly supported. Facts regarding classes of objects can be stored and manipulated in the same way as facts regarding object instances. Our model is upwards compatible with the standard relational model.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data manipulation languages (DML)}", } @InProceedings{Vardi:1989:ITA, author = "M. Y. Vardi", title = "Invited talk: automata theory for database theoreticians", crossref = "ACM:1989:PPE", pages = "83--92", year = "1989", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p83-vardi/p83-vardi.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p83-vardi/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p83-vardi/", acknowledgement = ack-nhfb, keywords = "design; theory", subject = "{\bf F.1.1} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Models of Computation, Automata. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General. {\bf F.4.3} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Formal Languages, Algebraic language theory. {\bf F.1.2} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Modes of Computation, Alternation and nondeterminism.", } @InProceedings{Cammarata:1989:ERD, author = "Stephanie Cammarata and Prasadram Ramachandra and Darrell Shane", title = "Extending a relational database with deferred referential integrity checking and intelligent joins", crossref = "Clifford:1989:PAS", pages = "88--97", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p88-cammarata/p88-cammarata.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p88-cammarata/", abstract = "Interactive use of relational database management systems (DBMS) requires a user to be knowledgeable about the semantics of the application represented in the database. In many cases, however, users are not trained in the application field and are not DBMS experts. Two categories of functionality are problematic for such users: (1) updating a database without violating integrity constraints imposed by the domain and (2) using join operations to retrieve data from more than one relation. We have been conducting research to help an uninformed or casual user interact with a relational DBMS. \par This paper describes two capabilities to aid an interactive database user who is neither an application specialist nor a DBMS expert. We have developed deferred Referential Integrity Checking (RIC) and Intelligent Join (IJ) which extend the operations of a relational DBMS. These facilities are made possible by explicit representation of database semantics combined with a relational schema. Deferred RIC is a static validation procedure that checks uniqueness of tuples, non-null keys, uniqueness of keys, and inclusion dependencies. IJ allows a user to identify only the ``target'' data which is to be retrieved without the need to additionally specify ``join clauses''. In this paper we present the motivation for these facilities, describe the features of each, and present examples of their use.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Human Factors", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Models and Principles --- User/Machine Systems (H.1.2): {\bf Human factors}; Information Systems --- Information Storage and Retrieval --- Content Analysis and Indexing (H.3.1): {\bf Dictionaries}", } @InProceedings{Manchanda:1989:DED, author = "S. Manchanda", title = "Declarative expression of deductive database updates", crossref = "ACM:1989:PPE", pages = "93--100", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p93-manchanda/p93-manchanda.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p93-manchanda/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p93-manchanda/", abstract = "An update can be specified as a single database state transition, or as a sequence of queries and database state transitions. We give an extension of Datalog for expressing both types of update specifications on a logic database. The extension supports the simple and intuitive expression of basic update operations, hypothetical reasoning and update procedures. The extension possesses a possible-world semantics, and a sound and complete proof theory. Soundness and completeness is proved by showing that an update procedure can be mapped into a semantically equivalent Pure Prolog program. This means that the semantic and proof-theoretic results of Pure Prolog can be mapped into similar results for the Datalog extension.", acknowledgement = ack-nhfb, generalterms = "Design", keywords = "design", subject = "{\bf F.3.1} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Specifying and Verifying and Reasoning about Programs. {\bf I.2.1} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Applications and Expert Systems. {\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General. {\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic. {\bf D.3.2} Software, PROGRAMMING LANGUAGES, Language Classifications, Prolog.", } @InProceedings{Copeland:1989:CHA, author = "George Copeland and Tom Keller", title = "A comparison of high-availability media recovery techniques", crossref = "Clifford:1989:PAS", pages = "98--109", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p98-copeland/p98-copeland.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p98-copeland/", abstract = "{\em We compare two high-availability techniques for recovery from media failures in database systems. Both techniques achieve high availability by having two copies of all data and indexes, so that recovery is immediate. ``Mirrored declustering'' spreads two copies of each relation across two identical sets of disks. ``Interleaved declustering'' spreads two copies of each relation across one set of disks while keeping both copies of each tuple on separate disks. Both techniques pay the same costs of doubling storage requirements and requiring updates to be applied to both copies}. \par {\em Mirroring offers greater simplicity and universality. Recovery can be implemented at lower levels of the system software (e.g., the disk controller). For architectures that do not share disks globally, it allows global and local cluster indexes to be independent. Also, mirroring does not require data to be declustered (i.e., spread over multiple disks)}. \par {\em Interleaved declustering offers significant improvements in recovery time, mean time to loss of both copies of some data, throughput during normal operation, and response time during recovery. For all architectures, interleaved declustering enables data to be spread over twice as many disks for improved load balancing. We show how tuning for interleaved declustering is simplified because it is dependent only on a few parameters that are usually well known for a specific workload and system configuration}.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Measurement; Performance; Security", subject = "Information Systems --- Database Management --- General (H.2.0): {\bf Security, integrity, and protection**}; Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Recovery and restart}; Information Systems --- Database Management --- Database Administration (H.2.7): {\bf Logging and recovery}; Data --- Files (E.5): {\bf Backup/recovery}", } @InProceedings{Atzeni:1989:UDW, author = "P. Atzeni and R. Torlone", title = "Updating databases in the weak instance model", crossref = "ACM:1989:PPE", pages = "101--109", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p101-atzeni/p101-atzeni.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p101-atzeni/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p101-atzeni/", abstract = "{\em Database updates have recently received much more attention than in the past. In this trend, a solid foundation is provided to the problem of updating databases through interfaces based on the weak instance model. Insertions and deletions of tuples are considered}. \par {\em As a preliminary tool, a lattice on states is defined, based on the information content of the various states}. \par {\em Potential results of an insertion are states that contain at least the information in the original state and that in the new tuple. Sometimes there is no potential result, and in the other cases there may be many of them. We argue that the insertion is deterministic if the state that contains the information common to all the potential results (the greatest lower bound, in the lattice framework) is itself a potential result. Effective characterizations for the various cases exist. A symmetric approach is followed for deletions, with fewer cases, since there are always potential results; determinism is characterized consequently}.", acknowledgement = ack-nhfb, generalterms = "Design; Theory", keywords = "design; theory", subject = "{\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General. {\bf F.1.2} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Modes of Computation, Parallelism and concurrency. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf I.2.1} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Applications and Expert Systems.", } @InProceedings{Tay:1989:AA, author = "Y. C. Tay", title = "Attribute agreement", crossref = "ACM:1989:PPE", pages = "110--119", year = "1989", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p110-tay/p110-tay.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p110-tay/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p110-tay/", acknowledgement = ack-nhfb, keywords = "algorithms; design; theory", subject = "{\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Distributed databases. {\bf F.2.2} Theory of Computation, ANALYSIS OF ALGORITHMS AND PROBLEM COMPLEXITY, Nonnumerical Algorithms and Problems, Sequencing and scheduling.", } @InProceedings{Schneider:1989:PEF, author = "Donovan A. Schneider and David J. DeWitt", title = "A performance evaluation of four parallel join algorithms in a shared-nothing multiprocessor environment", crossref = "Clifford:1989:PAS", pages = "110--121", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p110-schneider/p110-schneider.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p110-schneider/", abstract = "In this paper we analyze and compare four parallel join algorithms. Grace and Hybrid hash represent the class of hash-based join methods, Simple hash represents a looping algorithm with hashing, and our last algorithm is the more traditional sort-merge. The performance of each of the algorithms with different tuple distribution policies, the addition of bit vector filters, varying amounts of main-memory for joining, and non-uniformly distributed join attribute values is studied. The Hybrid hash-join algorithm is found to be superior except when the join attribute values of the inner relation are non-uniformly distributed and memory is limited. In this case, a more conservative algorithm such as the sort-merge algorithm should be used. The Gamma database machine serves as the host for the performance comparison.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Experimentation; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Mathematics of Computing --- Numerical Analysis --- General (G.1.0): {\bf Parallel algorithms}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Data --- Data Storage Representations (E.2): {\bf Hash-table representations}", } @InProceedings{Wang:1989:CCT, author = "K. Wang", title = "Can constant-time-maintainability be more practical?", crossref = "ACM:1989:PPE", pages = "120--127", year = "1989", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p120-wang/p120-wang.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p120-wang/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p120-wang/", acknowledgement = ack-nhfb, keywords = "algorithms; design; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design. {\bf F.4.2} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Grammars and Other Rewriting Systems, Decision problems. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Carey:1989:PCC, author = "Michael J. Carey and Miron Livny", title = "Parallelism and concurrency control performance in distributed database machines", crossref = "Clifford:1989:PAS", pages = "122--133", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p122-carey/p122-carey.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p122-carey/", abstract = "While several distributed (or `shared nothing') database machines exist in the form of prototypes or commercial products, and a number of distributed concurrency control algorithms are available, the effect of parallelism on concurrency control performance has received little attention. This paper examines the interplay between parallelism and transaction performance in a distributed database machine context. Four alternative concurrency control algorithms are considered, including two-phase locking, wound-wait, basic timestamp ordering, and optimistic concurrency control. Issues addressed include how performance scales as a function of machine size and the degree to which partitioning the database for intra-transaction parallelism improves performance for the different algorithms. We examine performance from several perspectives, including response time, throughput, and speedup, and we do so over a fairly wide range of system loads. We also examine the performance impact of certain important overhead factors (e.g., communication and process initiation costs) on the four alternative concurrency control algorithms.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Experimentation; Languages; Measurement; Performance; Reliability", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Mathematics of Computing --- Numerical Analysis --- General (G.1.0): {\bf Parallel algorithms}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}; Computer Systems Organization --- Performance of Systems (C.4): {\bf Performance attributes}", } @InProceedings{Mannila:1989:PAF, author = "H. Mannila and K.-J. Raiha", title = "Practical algorithms for finding prime attributes and testing normal forms", crossref = "ACM:1989:PPE", pages = "128--133", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p128-mannila/p128-mannila.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p128-mannila/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p128-mannila/", abstract = "Several decision problems for relational schemas with functional dependencies are computationally hard. Such problems include determining whether an attribute is prime and testing if a schema is in normal form. Algorithms for these problems are needed in database design tools. The problems can be solved by trivial exponential algorithms. Although the size of the instance is usually given by the number of attributes and hence is fairly small, such exponential algorithms are not usable for all design tasks. We give algorithms for these problems whose running time is polynomial in the number of maximal sets not determining an attribute or, equivalently, the number of generators of the family of closed attribute sets. There is theoretical and practical evidence that this quantity is small for the schemas occurring in practice and exponential only for pathological schemas. The algorithms are simple to implement and fast in practice. They are in use in the relational database design tool Design-By-Example.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", keywords = "algorithms; design; theory", subject = "{\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models. {\bf F.4.2} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Grammars and Other Rewriting Systems, Decision problems. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Computational logic.", } @InProceedings{Elkan:1989:DPC, author = "C. Elkan", title = "A decision procedure for conjunctive query disjointness", crossref = "ACM:1989:PPE", pages = "134--139", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p134-elkan/p134-elkan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p134-elkan/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p134-elkan/", abstract = "This paper presents an algorithm that decides whether two conjunctive query expressions always describe disjoint sets of tuples. The decision procedure solves an open problem identified by Blakeley, Coburn, and Larson: how to check whether an explicitly stored view relation must be recomputed after an update, taking into account functional dependencies. For nonconjunctive queries, the disjointness problem is {\em NP\/} -hard. For conjunctive queries, the time complexity of the algorithm given cannot be improved unless the reachability problem for directed graphs can be solved in sublinear time. The algorithm is novel in that it combines separate decision procedures for the theory of functional dependencies and for the theory of dense orders. Also, it uses tableaux that are capable of representing all six comparison operators , , =, , , and .", acknowledgement = ack-nhfb, generalterms = "Design", keywords = "design", subject = "{\bf F.4.2} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Grammars and Other Rewriting Systems, Decision problems. {\bf F.1.3} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Complexity Measures and Classes. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Kifer:1989:FLH, author = "Michael Kifer and Georg Lausen", title = "{F}-logic: a higher-order language for reasoning about objects, inheritance, and scheme", crossref = "Clifford:1989:PAS", pages = "134--146", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p134-kifer/p134-kifer.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p134-kifer/", abstract = "We propose a database logic which accounts in a clean declarative fashion for most of the ``object-oriented'' features such as object identity, complex objects, inheritance, methods, etc. Furthermore, database schema is part of the object language, which allows the user to browse schema and data using the same declarative formalism. The proposed logic has a formal semantics and a sound and complete resolution-based proof procedure, which makes it also computationally attractive.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages; Verification", subject = "Software --- Programming Languages --- Language Classifications (D.3.2): {\bf Specialized application languages}; Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Semantic networks}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data description languages (DDL)}; Software --- Programming Languages --- Formal Definitions and Theory (D.3.1): {\bf Semantics}", } @InProceedings{Ullman:1989:BBT, author = "J. D. Ullman", title = "Bottom-up beats top-down for datalog", crossref = "ACM:1989:PPE", pages = "140--149", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p140-ullman/p140-ullman.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p140-ullman/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p140-ullman/", abstract = "We show that for any safe datalog program {$P$} 1 and any query {$Q$} (predicate of {$P$} 1 with some bound arguments), there is another safe datalog program {$P$} 2 that produces the answer to {$Q$} and takes no more time when evaluated by semi-naive evaluation than when {$P$} 1 is evaluated topdown.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Theory", keywords = "algorithms; design; languages; theory", subject = "{\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog.", } @InProceedings{Hull:1989:AOO, author = "Richard Hull and Jianwen Su", title = "On accessing object-oriented databases: expressive power, complexity, and restrictions", crossref = "Clifford:1989:PAS", pages = "147--158", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p147-hull/p147-hull.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p147-hull/", abstract = "A formal framework for studying the expressive power and complexity of OODB queries is developed. Three approaches to modeling sets are articulated and compared. The class of {\em regular\/} OODB schemas supports the explicit representation of set-valued types. Using an {\em object-based\/} semantics for sets, the regular schemas correspond to most implemented OODB systems in the literature; a {\em value-based\/} semantics for sets is also introduced. Without restrictions, both of these approaches support the specification of all computable queries. Assuming that the new operator is prohibited, the query language of the regular OODB schemas under the object-based semantics is complete in PSPACE; and under the value-based semantics it has hyper-exponential complexity. The third approach to modeling sets is given by the {\em algebraic OODB\/} model, in which multi-valued attributes rather than set-valued types are supported. method implementations can use operators stemming from the relational algebra, and do not have side-effects. The query language of algebraic OODBs is more powerful than the relational algebra but has complexity bounded by PTIME. The expressive power and complexity of data access for other variations of OODBs are also considered. Finally, a new relational query language, called {\em algebra\/} + {\em pointwise recursion}, is introduced. This is equivalent to the algebraic OODB language, and can compute generalized transitive closure.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Query formulation}; Software --- Programming Languages --- Formal Definitions and Theory (D.3.1): {\bf Semantics}; Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Access methods}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2): {\bf Algebraic approaches to semantics}", } @InProceedings{Seki:1989:PAT, author = "H. Seki", title = "On the power of {Alexander} templates", crossref = "ACM:1989:PPE", pages = "150--159", year = "1989", bibdate = "Wed Oct 25 08:47:34 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p150-seki/p150-seki.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p150-seki/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p150-seki/", acknowledgement = ack-nhfb, keywords = "algorithms; design; languages; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf I.2.1} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Applications and Expert Systems. {\bf F.1.3} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Complexity Measures and Classes. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog.", } @InProceedings{Abiteboul:1989:OIQ, author = "Serge Abiteboul and Paris C. Kanellakis", title = "Object identity as a query language primitive", crossref = "Clifford:1989:PAS", pages = "159--173", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p159-abiteboul/p159-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p159-abiteboul/", abstract = "We demonstrate the power of object identities (oid's) as a database query language primitive. We develop an object-based data model, whose structural part generalizes most of the known complex-object data models: cyclicity is allowed in both its schemas and instances. Our main contribution is the operational part of the data model, the query language IQL, which uses oid's for three critical purposes: (1) to represent data-structures with sharing and cycles, (2) to manipulate sets and (3) to express any computable database query. IQL can be statically type checked, can be evaluated bottom-up and naturally generalizes most popular rule-based database languages. The model can also be extended to incorporate type inheritance, without changes to IQL. Finally, we investigate an analogous value-based data model, whose structural part is founded on regular infinite trees and whose operational part is IQL.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Constructs and Features (D.3.3): {\bf Modules, packages}; Software --- Programming Languages --- Formal Definitions and Theory (D.3.1): {\bf Semantics}", } @InProceedings{Sagiv:1989:SDQ, author = "Y. Sagiv and M. Y. Vardi", title = "Safety of datalog queries over infinite databases", crossref = "ACM:1989:PPE", pages = "160--171", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p160-sagiv/p160-sagiv.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p160-sagiv/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p160-sagiv/", abstract = "A query is {\em safe\/} with respect to a set of constraints if for every database that satisfies the constraints the query is guaranteed to yield a finite set of answers. We study here the safety problem for Datalog programs with respect to {\em finiteness constraints}. We show that safety can be viewed as a combination of two properties: {\em weak safety}, which guarantees the finiteness of intermediate answers, and {\em termination}, which guarantees the finiteness of the evaluation. We prove that while weak safety is decidable, termination is not. We then consider {\em monadic\/} programs, i.e., programs in which all intensional predicates are monadic, and show that safety is decidable in polynomial time for monadic programs. While we do not settle the safety problem, we show that a closely related problem, the decision problem for safety with respect to {\em functional dependencies}, is undecidable even for monadic programs.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Theory", keywords = "algorithms; design; languages; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.4.2} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Grammars and Other Rewriting Systems, Decision problems. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog.", } @InProceedings{Ramakrishnan:1989:PTT, author = "R. Ramakrishnan and Y. Sagiv and J. D. Ullman and M. Y. Vardi", title = "Proof-tree transformation theorems and their applications", crossref = "ACM:1989:PPE", pages = "172--181", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p172-ramakrishnan/p172-ramakrishnan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p172-ramakrishnan/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p172-ramakrishnan/", abstract = "For certain sets of logical rules, one can demonstrate that for every proof tree there is another tree proving the same fact and having a special form. One technique for detecting such opportunities is to reduce the question to one of conjunctive-query containment. A more powerful technique is to test whether one conjunctive query is contained in the infinite union of conjunctive queries formed by expanding a set of recursive rules. We discuss two applications of these techniques. First, we give tests for commutativity of linear rules. When linear rules commute, we can reduce the complexity of ``counting'' methods for query evaluation from exponential to polynomial; commutativity also implies separability in the sense of Naughton. A second application is the discovery of linear rules that are equivalent to given nonlinear rules.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", keywords = "algorithms; design; theory", subject = "{\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Chomicki:1989:RSI, author = "Jan Chomicki and Tomasz Imieli{\'n}ski", title = "Relational specifications of infinite query answers", crossref = "Clifford:1989:PAS", pages = "174--183", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p174-chomicki/p174-chomicki.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p174-chomicki/", abstract = "We investigate here functional deductive databases: an extension of DATALOG capable of representing infinite phenomena. Rules in functional deductive databases are Horn and predicates can have arbitrary unary and limited $k$-ary function symbols in one fixed position. This class is known to be decidable. However, least fixpoints of functional rules may be infinite. We present here a method to finitely represent infinite least fixpoints and infinite query answers as {\em relational specifications}. Relational specifications consist of a finite set of tuples and of a finitely specified congruence relation. Our method is applicable to every domain-independent set of functional rules.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Graph algorithms}; Theory of Computation --- Computation by Abstract Devices --- Complexity Measures and Classes (F.1.3); Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Computing Methodologies --- Artificial Intelligence --- Natural Language Processing (I.2.7): {\bf DATALOG}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3)", } @InProceedings{Saraiya:1989:LNR, author = "Y. P. Saraiya", title = "Linearising nonlinear recursions in polynomial time", crossref = "ACM:1989:PPE", pages = "182--189", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p182-saraiya/p182-saraiya.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p182-saraiya/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p182-saraiya/", abstract = "The replacement of nonlinear recursions with equivalent linear recursions is a potentially useful query optimization strategy, since it permits the use of efficient algorithms for the evaluation of linear logic programs. We show that a member of a certain class of bilinear recursions is linearizable in a strong sense if and only if a specific partial proof tree derived from this recursion is contained in a bounded number of partial proof trees generated by the recursion. Further, while each such test of containment between proof trees involves an exponential number of conjunctive-query containment tests, we present syntactic conditions on the recursion that are necessary and sufficient for the containment and verifiable in polynomial time.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Theory", keywords = "design; languages; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog.", } @InProceedings{Sun:1989:SIP, author = "Xian-He Sun and Nabil Kamel and Lionel M. Ni", title = "Solving implication problems in database applications", crossref = "Clifford:1989:PAS", pages = "185--192", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p185-sun/p185-sun.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p185-sun/", abstract = "Computing queries from derived relations, optimizing queries from a group of queries, and updating materialized views are important database problems and have attracted much attention. One thing common to these problems is their demand to quickly solve the implication problem -- given two predicates {$Q$} and ??, can {$Q$} imply ({$Q$})? The implication problem has been solved by converting it into a satisfiability problem. Based on a graph representation, a detailed study of the general implication problem on its own is presented in this paper. We proved that the general implication problem, in which all six comparison operators: =, , , , , , as well as conjunctions and disjunctions are allowed, is NP-hard. In the case when ``'' operators are not allowed in {$Q$} and disjunctions are not allowed in , a polynomial time algorithm is proposed to solve this restricted implication problem. The influence of the ``'' operator and disjunctions are studied. Our theoretical results show that for some special cases the polynomial complexity algorithm can solve the implication problem which allows the ``'' operator or disjunctions in the predicates. Necessary conditions for detecting when the ``'' operator and disjunctions are allowed are also given. These results are very useful in creating heuristic methods.", acknowledgement = ack-nhfb, generalterms = "Algorithms", subject = "Information Systems --- Database Management --- Database Applications (H.2.8); Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Numerical Algorithms and Problems (F.2.1): {\bf Computations on polynomials}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Graph algorithms}", } @InProceedings{Brodsky:1989:IMC, author = "A. Brodsky and Y. Sagiv", title = "Inference of monotonicity constraints in datalog programs", crossref = "ACM:1989:PPE", pages = "190--199", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p190-brodsky/p190-brodsky.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p190-brodsky/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p190-brodsky/", abstract = "Datalog (i.e., function-free logic) programs with monotonicity constraints on extensional predicates are considered. A monotonicity constraint states that one argument of a predicate is always less than another argument, according to some partial order. Relations of an extensional database are required to satisfy the monotonicity constraints imposed on their predicates. More specifically, a partial order is defined on the domain (i.e., set of constants) of the database, and every tuple of each relation satisfies the monotonicity constraints imposed on its predicate. An algorithm is given for inferring all monotonicity constraints that hold in relations of the intensional database from monotonicity constraints that hold in the extensional database. A complete inference algorithm is also given for disjunctions of monotonicity and equality constraints. It is shown that the inference of monotonicity constraints in programs is a complete problem for exponential time. For linear programs, this problem is complete for polynomial space.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Theory", keywords = "design; languages; theory", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf I.2.1} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Applications and Expert Systems. {\bf I.2.3} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Deduction and Theorem Proving, Nonmonotonic reasoning and belief revision.", } @InProceedings{Bry:1989:TEE, author = "Fran{\c{c}}ois Bry", title = "Towards an efficient evaluation of general queries: quantifier and disjunction processing revisited", crossref = "Clifford:1989:PAS", pages = "193--204", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p193-bry/p193-bry.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p193-bry/", abstract = "{\em Database applications often require to evaluate queries containing quantifiers or disjunctions, e.g., for handling general integrity constraints. Existing efficient methods for processing quantifiers depart from the relational model as they rely on non-algebraic procedures. Looking at quantified query evaluation from a new angle, we propose an approach to process quantifiers that makes use of relational algebra operators only. Our approach performs in two phases. The first phase normalizes the queries producing a canonical form. This form permits to improve the translation into relational algebra performed during the second phase. The improved translation relies on a new operator - the\/} complement-join - {\em that generalizes the set difference, on algebraic expressions of universal quantifiers that avoid the expensive division operator in many cases, and on a special processing of disjunctions by means of\/} constrained outer-joins. {\em Our method achieves an efficiency at least comparable with that of previous proposals, better in most cases. Furthermore, it is considerably simpler to implement as it completely relies on relational data structures and operators}.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Standardization; Theory", subject = "Information Systems --- Database Management --- Database Applications (H.2.8); Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Cohen:1989:WSP, author = "S. Cohen and O. Wolfson", title = "Why a single parallelization strategy is not enough in knowledge bases", crossref = "ACM:1989:PPE", pages = "200--216", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p200-cohen/p200-cohen.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p200-cohen/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p200-cohen/", abstract = "We argue that the appropriate parallelization strategy for logic-program evaluation depends on the program being evaluated. Therefore, this paper is concerned with the issues of program-classification, and parallelization-strategies. We propose five parallelization strategies that differ based on the following criteria. Their evaluation cost, the overhead of communication and synchronization among processors, and the programs to which they are applicable. In particular, we start our study with pure-parallelization, i.e., parallelization without overhead. An interesting class-structure of logic programs is demonstrated, when considering amenability to pure-parallelization. The relationship to the NC complexity class is discussed. Then we propose strategies that do incur an overhead, but are optimal in a sense that will be precisely defined. \par This paper makes the initial steps towards a theory of parallel logic-programming.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Theory", keywords = "design; languages; theory", subject = "{\bf I.2.1} Computing Methodologies, ARTIFICIAL INTELLIGENCE, Applications and Expert Systems. {\bf F.1.2} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Modes of Computation, Parallelism and concurrency. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General.", } @InProceedings{Ioannidis:1989:CRR, author = "Yannis E. Ioannidis and Timos K. Sellis", title = "Conflict resolution of rules assigning values to virtual attributes", crossref = "Clifford:1989:PAS", pages = "205--214", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p205-ioannidis/p205-ioannidis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p205-ioannidis/", abstract = "In the majority of research work done on logic programming and deductive databases, it is assumed that the set of rules defined by the user is {\em consistent}, i.e., that no contradictory facts can be inferred by the rules. In this paper, we address the problem of resolving conflicts of rules that assign values to virtual attributes. We devise a general framework for the study of the problem, and we propose an approach that subsumes all previously suggested solutions. Moreover, it suggests several additional solutions, which very often capture the semantics of the data more accurately than the known approaches. Finally, we address the issue of how to index rules so that conflicts are resolved efficiently, i.e., only one of the applicable rules is processed at query time.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Information Systems --- Database Management --- Languages (H.2.3); Information Systems --- Database Management --- General (H.2.0)", } @InProceedings{McCarthy:1989:AAD, author = "Dennis McCarthy and Umeshwar Dayal", title = "The architecture of an active database management system", crossref = "Clifford:1989:PAS", pages = "215--224", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p215-mccarthy/p215-mccarthy.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p215-mccarthy/", abstract = "The HiPAC project is investigating active, time-constrained database management. An active DBMS is one which automatically executes specified actions when specified conditions arise. HiPAC has proposed Event-Condition-Action (ECA) rules as a formalism for active database capabilities. We have also developed an execution model that specifies how these rules are processed in the context of database transactions. The additional functionality provided by ECA rules makes new demands on the design of an active DBMS. In this paper we propose an architecture for an active DBMS that supports ECA rules. This architecture provides new forms of interaction, in support of ECA rules, between application programs and the DBMS. This leads to a new paradigm for constructing database applications.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Database Applications (H.2.8); Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}; Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Representations (procedural and rule-based)}", } @InProceedings{Sector:1989:ITM, author = "A. Z. Sector", title = "Invited talk: modular architectures for distributed and databases systems", crossref = "ACM:1989:PPE", pages = "217--224", year = "1989", bibdate = "Thu Mar 12 18:48:02 MST 1998", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p217-sector/", acknowledgement = ack-nhfb, keywords = "design; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf H.2.6} Information Systems, DATABASE MANAGEMENT, Database Machines. {\bf C.0} Computer Systems Organization, GENERAL, Systems specification methodology. {\bf C.2.0} Computer Systems Organization, COMPUTER-COMMUNICATION NETWORKS, General.", } @InProceedings{Spector:1989:ITM, author = "A. Z. Spector", title = "Invited talk: modular architectures for distributed and databases systems", crossref = "ACM:1989:PPE", pages = "217--224", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p217-spector/p217-spector.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p217-spector/", abstract = "This paper describes the importance of modularity in systems and lists a number of reasons why systems will become increasingly modular. It describes two strawmen architecture models for systems and distributed databases in order to illustrate the hierarchical decomposition of complex systems. The paper also relates the systems model to the layering achieved in a few systems familiar to the author.", acknowledgement = ack-nhfb, generalterms = "Design; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Database Machines (H.2.6); Computer Systems Organization --- General (C.0): {\bf Systems specification methodology}; Computer Systems Organization --- Computer-Communication Networks --- General (C.2.0)", } @InProceedings{Cohen:1989:CCD, author = "D. Cohen", title = "Compiling complex database transition triggers", crossref = "Clifford:1989:PAS", pages = "225--234", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p225-cohen/p225-cohen.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p225-cohen/", abstract = "This paper presents a language for specifying database updates, queries and rule triggers, and describes how triggers can be compiled into an efficient mechanism. The rule language allows specification of both state and transition constraints as special cases, but is more general than either. The implementation we describe compiles rules and updates independently of each other. Thus rules can be added or deleted without recompiling any update program and vice versa.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages", subject = "Information Systems --- Database Management --- Database Applications (H.2.8); Software --- Programming Languages --- Processors (D.3.4): {\bf Compilers}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Data manipulation languages (DML)}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Rotem:1989:CMH, author = "D. Rotem", title = "Clustered multiattribute hash files", crossref = "ACM:1989:PPE", pages = "225--234", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p225-rotem/p225-rotem.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p225-rotem/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p225-rotem/", abstract = "Access methods for multidimensional data have attracted much research interest in recent years. In general, the data structures proposed for this problem partition the database into a set of disk pages (buckets). Access to the buckets is provided by searching a directory of some type such as a tree directory or inverted index or by computation of a multiattribute hash function. Examples of the first approach are Multidimensional B-trees[Sch82], K-D-B trees[Rob81] (see also [Sam84] for a survey of these methods) whereas multiattribute hashing methods are described for example in [Rot74],[Aho79],[Riv76] and [Ram83]. In addition, there are also hybrid methods which combine hashing with a directory of some type [Ore84],[Nie84], [Fag79]. \par In all the work mentioned above, the performance is measured in terms of the number of disk accesses made to retrieve the answer without distinguishing whether these are sequential or random. We argue that performance measurements must consider this factor in order to be realistic, especially in the single user environment. Some evidence to support this claim is given in [Sal88, pg. 22] with the IBM 3380 disk drive as an example. For this type of disk, a comparison between accessing $m$ blocks randomly and accessing a contiguous cluster of $m$ blocks is made. The results show that for $m$ = 10, the random access is slower by a factor of about 8 than the clustered one whereas for $m$ = 100 it is slower by a factor of 25. \par Another motivation for this work are optical disks. In this case, there is a big advantage in clustering since the access mechanism on many of these drives is equipped with an adjustable mirror which allows slight deflections of the laser beam. This means that it may be possible to read a complete cluster from a sequence of adjacent tracks beneath the head with a single random seek [Chri88]. \par Our work is inspired by an interesting recent paper [Fal86] which proposes to organize the physical layout of a multiattribute hash file by encoding record signatures using gray code rather than simple binary code. In this way neighboring buckets contain records which differ on a single bit in their signatures. It is then proved that the records which form the answer to a partial match query will tend to be contained in a smaller number of clusters as compared with the binary arrangement. It is also shown that this idea is applicable to many other multiattribute hashing schemes with a small amount of overhead. In addition, it can improve access time to directories of grid type files, extendible hashing and file methods which employ the z-ordering [Ore84].", acknowledgement = ack-nhfb, generalterms = "Design; Measurement; Performance; Theory", keywords = "design; measurement; performance; theory", subject = "{\bf E.2} Data, DATA STORAGE REPRESENTATIONS, Hash-table representations. {\bf E.5} Data, FILES. {\bf E.1} Data, DATA STRUCTURES. {\bf H.2.7} Information Systems, DATABASE MANAGEMENT, Database Administration, Data dictionary/directory.", } @InProceedings{Naughton:1989:EER, author = "J. F. Naughton and R. Ramakrishnan and Y. Sagiv and J. D. Ullman", title = "Efficient evaluation of right-, left-, and multi-linear rules", crossref = "Clifford:1989:PAS", pages = "235--242", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p235-naughton/p235-naughton.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p235-naughton/", abstract = "We present an algorithm for the efficient evaluation of a useful subset of recursive queries. Like the magic sets transformation, the algorithm consists of a rewriting phase followed by semi-naive bottom-up evaluation of the resulting rules. We prove that on a wide range of recursions, this algorithm achieves a factor of ($n$) speedup over magic sets. Intuitively, the transformations in this algorithm achieve their performance by reducing the arity of the recursive predicates in the transformed rules.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Mathematical Logic and Formal Languages --- Formal Languages (F.4.3): {\bf Classes defined by grammars or automata}", } @InProceedings{Johnson:1989:UBT, author = "T. Johnson and D. Shasha", title = "Utilization of {B}-trees with inserts, deletes and modifies", crossref = "ACM:1989:PPE", pages = "235--246", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p235-johnson/p235-johnson.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p235-johnson/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p235-johnson/", abstract = "The utilization of B-tree nodes determines the number of levels in the B-tree and hence its performance. Until now, the only analytical aid to the determination of a B-tree's utilization has been the analysis by Yao and related work. Yao showed that the utilization of B-tree nodes under pure inserts was 69\%. We derive analytically and verify by simulation the utilization of B-tree nodes constructed from $n$ inserts followed by $M$ modifies (where $M ? N$), where each modify is a delete followed by an insert. Assuming that nodes only merge when they are empty (the technique used in most database management systems), we show that the utilization is 39\% as M becomes large. We extend this model to a parameterized mixture of inserts and modifies. Surprisingly, if the modifies are mixed with just 10\% inserts, then the utilization is over 62\%. We also calculated the probability of splitting and merging. We derive a simple rule-of-thumb that accurately calculates the probability of splitting. We present two models for computing this utilization, the more accurate of which remembers items inserted and then deleted in a node --- we call such items ghosts.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Experimentation", keywords = "algorithms; experimentation", subject = "Data --- Data Structures (E.1): {\bf Trees}; Information Systems --- Information Storage and Retrieval --- Content Analysis and Indexing (H.3.1): {\bf Indexing methods}", } @InProceedings{Larson:1989:FSS, author = "P.-A. Larson and V. Deshpande", title = "A file structure supporting traversal recursion", crossref = "Clifford:1989:PAS", pages = "243--252", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p243-larson/p243-larson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p243-larson/", abstract = "Traversal recursion is a class of recursive queries where the evaluation of the query involves traversal of a graph or a tree. This limited type of recursion arises in many applications. In this report we investigate a simple file structure that efficiently supports traversal recursion over large, acyclic graphs. The nodes of the graph are sorted in topological order and stored in a B-tree. Hence, traversal of the graph can be done in a single scan. Nodes and edges can also be inserted, deleted, and modified efficiently.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance; Theory", subject = "Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2): {\bf File organization}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Graph algorithms}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Trees}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}", } @InProceedings{Faloutsos:1989:FSK, author = "C. Faloutsos and S. Roseman", title = "Fractals for secondary key retrieval", crossref = "ACM:1989:PPE", pages = "247--252", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p247-faloutsos/p247-faloutsos.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p247-faloutsos/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p247-faloutsos/", abstract = "In this paper we propose the use of fractals and especially the Hilbert curve, in order to design good distance-preserving mappings. Such mappings improve the performance of secondary-key- and spatial- access methods, where multi-dimensional points have to be stored on a 1-dimensional medium (e.g., disk). Good clustering reduces the number of disk accesses on retrieval, improving the response time. Our experiments on range queries and nearest neighbor queries showed that the proposed Hilbert curve achieves better clustering than older methods (``bit-shuffling'', or Peano curve), for every situation we tried.", acknowledgement = ack-nhfb, generalterms = "Design; Experimentation; Performance; Theory", keywords = "design; experimentation; performance; theory", subject = "{\bf H.2.2} Information Systems, DATABASE MANAGEMENT, Physical Design, Access methods. {\bf H.3.3} Information Systems, INFORMATION STORAGE AND RETRIEVAL, Information Search and Retrieval. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Faloutsos:1989:DUE, author = "C. Faloutsos and D. Metaxas", title = "Declustering using error correcting codes", crossref = "ACM:1989:PPE", pages = "253--258", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p253-faloutsos/p253-faloutsos.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p253-faloutsos/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p253-faloutsos/", abstract = "The problem examined is to distribute a binary Cartesian product file on multiple disks to maximize the parallelism for partial match queries. Cartesian product files appear as a result of some secondary key access methods, such as the multiattribute hashing [10], the grid file [6] etc.. For the binary case, the problem is reduced into grouping the 2 $n$ binary strings on $n$ bits in $m$ groups of unsimilar strings. The main idea proposed in this paper is to group the strings such that the group forms an Error Correcting Code (ECC). This construction guarantees that the strings of a given group will have large Hamming distances, i.e., they will differ in many bit positions. Intuitively, this should result into good declustering. We briefly mention previous heuristics for declustering, we describe how exactly to build a declustering scheme using an ECC, and we prove a theorem that gives a necessary condition for our method to be optimal. Analytical results show that our method is superior to older heuristics, and that it is very close to the theoretical (non-tight) bound.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", keywords = "design; performance", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf E.5} Data, FILES. {\bf E.2} Data, DATA STORAGE REPRESENTATIONS, Hash-table representations. {\bf H.2.2} Information Systems, DATABASE MANAGEMENT, Physical Design, Access methods.", } @InProceedings{Agrawal:1989:EMT, author = "R. Agrawal and A. Borgida and H. V. Jagadish", title = "Efficient management of transitive relationships in large data and knowledge bases", crossref = "Clifford:1989:PAS", pages = "253--262", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p253-agrawal/p253-agrawal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p253-agrawal/", abstract = "We argue that accessing the transitive closure of relationships is an important component of both databases and knowledge representation systems in Artificial Intelligence. The demands for efficient access and management of large relationships motivate the need for explicitly storing the transitive closure in a compressed and local way, while allowing updates to the base relation to be propagated incrementally. We present a transitive closure compression technique, based on labeling spanning trees with numeric intervals, and provide both analytical and empirical evidence of its efficacy, including a proof of optimality.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages; Verification", subject = "Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Representations (procedural and rule-based)}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Graph algorithms}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Trees}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}", } @InProceedings{Weihl:1989:IRC, author = "W. E. Weihl", title = "The impact of recovery on concurrency control", crossref = "ACM:1989:PPE", pages = "259--269", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p259-weihl/p259-weihl.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p259-weihl/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p259-weihl/", abstract = "It is widely recognized by practitioners that concurrency control and recovery for transaction systems interact in subtle ways. In most theoretical work, however, concurrency control and recovery are treated as separate, largely independent problems. In this paper we investigate the interactions between concurrency control and recovery. We consider two general recovery methods for abstract data types, update-in-place and deferred-update. While each requires operations to conflict if they do not ``commute,'' the two recovery methods require subtly different notions of commutativity. We give a precise characterization of the conflict relations that work with each recovery method, and show that each permits conflict relations that the other does not. Thus, the two recovery methods place incomparable constraints on concurrency control. Our analysis applies to arbitrary abstract data types, including those with operations that may be partial or non-deterministic.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", keywords = "algorithms; design; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Concurrency. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing. {\bf D.3.3} Software, PROGRAMMING LANGUAGES, Language Constructs and Features, Abstract data types. {\bf F.1.2} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Modes of Computation, Alternation and nondeterminism.", } @InProceedings{Gyssens:1989:GBA, author = "M. Gyssens and J. Paredaens and D. van Gucht", title = "A grammar-based approach towards unifying hierarchical data models", crossref = "Clifford:1989:PAS", pages = "263--272", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p263-gyssens/p263-gyssens.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p263-gyssens/", abstract = "A simple model for representing the hierarchical structure of information is proposed. This model, called the grammatical model, is based on trees that are generated by grammars; the grammars describe the hierarchy of the information represented by the trees. Two transformation languages, an algebra and a calculus, are presented and shown to be equally expressive.", acknowledgement = ack-nhfb, subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Trees}; Information Systems --- Database Management --- Database Applications (H.2.8)", } @InProceedings{Fu:1989:CCN, author = "A. Fu and T. Kameda", title = "Concurrency control of nested transactions accessing {B}-trees", crossref = "ACM:1989:PPE", pages = "270--285", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p270-fu/p270-fu.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p270-fu/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p270-fu/", abstract = "This paper presents a concurrency control algorithm for nested transactions accessing B-trees. It combines the idea of B-link tree with that of resilient 2-phase locking [Mos85b]. The I/O automaton model is used in the specification and proofs of correctness of the system. We define ``strongly-serially correct'' schedules and use this property as our correctness criterion.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages; Theory", keywords = "algorithms; languages; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Concurrency. {\bf E.1} Data, DATA STRUCTURES, Trees. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Transaction processing. {\bf E.2} Data, DATA STORAGE REPRESENTATIONS, Hash-table representations. {\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages. {\bf F.1.1} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Models of Computation, Automata.", } @InProceedings{Colby:1989:RAQ, author = "Latha S. Colby", title = "A recursive algebra and query optimization for nested relations", crossref = "Clifford:1989:PAS", pages = "273--283", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p273-colby/p273-colby.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p273-colby/", abstract = "{\em The nested relational model provides a better way to represent complex objects than the (flat) relational model, by allowing relations to have relation-valued attributes. A recursive algebra for nested relations that allows tuples at all levels of nesting in a nested relation to be accessed and modified without any special navigational operators and without having to flatten the nested relation has been developed. In this algebra, the operators of the nested relational algebra are extended with recursive definitions so that they can be applied not only to relations but also to subrelations of a relation. In this paper, we show that queries are more efficient and succinct when expressed in the recursive algebra than in languages that require restructuring in order to access subrelations of relations. We also show that most of the query optimization techniques that have been developed for the relational algebra can be easily extended for the recursive algebra and that queries are more easily optimizable when expressed in the recursive algebra than when they are expressed in languages like the non-recursive algebra}.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Mathematics of Computing --- Numerical Analysis --- Optimization (G.1.6)", } @InProceedings{Tansel:1989:NHR, author = "A. U. Tansel and L. Garnett", title = "Nested historical relations", crossref = "Clifford:1989:PAS", pages = "284--294", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p284-tansel/p284-tansel.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p284-tansel/", abstract = "The paper extends nested relations for managing temporal variation of complex objects. It combines the research in temporal databases and nested relations for nontraditional database applications. The basic modelling construct is a temporal atom as an attribute value. A temporal atom consists of two components, a value and temporal set which is a set of times denoting the validity period of the value. We define algebra operations for nested historical relations. Data redundancy in nested historical relations is also discussed and criteria for well-structured nested relations are established.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Database Applications (H.2.8); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2): {\bf File organization}", } @InProceedings{Bonner:1989:HDN, author = "A. J. Bonner", title = "Hypothetical datalog negation and linear recursion", crossref = "ACM:1989:PPE", pages = "286--300", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p286-bonner/p286-bonner.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p286-bonner/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p286-bonner/", abstract = "This paper examines an extension of Horn logic in which rules can add entries to a database hypothetically. Several researchers have developed logical systems along these lines, but the complexity and expressibility of such logics is only now being explored. It has been shown, for instance, that the data-complexity of these logics is {\em PSPACE\/} -complete in the function-free, predicate case. This paper extends this line of research by developing syntactic restrictions with lower complexity. These restrictions are based on two ideas from Horn-clause logic: {\em linear recursion\/} and {\em stratified negation}. In particular, a notion of stratification is developed in which negation-as-failure alternates with linear recursion. The complexity of such rulebases depends on the number of layers of stratification. The result is a hierarchy of syntactic classes which corresponds exactly in the polynomial-time hierarchy of complexity classes. In particular, rulebases with $k$ strata are data-complete for {$P$} $h$ . Furthermore, these rulebases provide a complete characterization of the relational queries in {$P$} $h$ . That is, any query whose graph is in {$P$} $h$ can be represented as a set of hypothetical rules with $k$ strata. Unlike other expressibility results in the literature, this result does not require the data domain to be linearly ordered.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance; Theory", keywords = "algorithms; design; performance; theory", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory. {\bf F.1.3} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Complexity Measures and Classes. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing.", } @InProceedings{Orenstein:1989:RSD, author = "J. A. Orenstein", title = "Redundancy in spatial databases", crossref = "Clifford:1989:PAS", pages = "295--305", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p295-orenstein/p295-orenstein.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p295-orenstein/", abstract = "Spatial objects other than points and boxes can be stored in spatial indexes, but the techniques usually require the use of approximations that can be arbitrarily bad. This leads to poor performance and highly inaccurate responses to spatial queries. The situation can be improved by storing some objects in the index redundantly. Most spatial indexes permit no flexibility in adjusting the amount of redundancy. Spatial indexes based on z-order permit this flexibility. Accuracy of the query response increases with redundancy, (there is a ``diminishing return'' effect). Search time, as measured by disk accesses first decreases and then increases with redundancy. There is, therefore, an optimal amount of redundancy (for a given data set). The optimal use of redundancy for z-order is explored through analysis of the z-order search algorithm and through experiments.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Access methods}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}", } @InProceedings{Lakshmanan:1989:IPG, author = "V. S. Lakshmanan and A. O. Mendelzon", title = "Inductive pebble games and the expressive power of datalog", crossref = "ACM:1989:PPE", pages = "301--310", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p301-lakshmanan/p301-lakshmanan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p301-lakshmanan/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p301-lakshmanan/", abstract = "As an alternative to logic-based query languages for recursive queries, we are investigating a graphical query language called {$G$} +, which allows, among other things, easy formulation of certain queries involving simple paths in directed graphs. This led us to study whether such queries are expressible in DATALOG, the language of function-free Horn clauses. Since some {$G$} + queries are NP-hard, and all DATALOG queries are polynomial time computable, the answer appears to be negative. However, it would be interesting to have proof techniques and tools for settling such questions with certainty. The objective of this paper is the development of one such tool, {\em inductive pebble games}, based on a normal form for DATALOG programs derived here, and its relationship to Alternating Turing Machine computations. As an application, we sketch a proof that the query ``find all pairs of nodes connected by a directed simple path of even length'' cannot be expressed in DATALOG.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Performance", keywords = "design; languages; performance", subject = "{\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Datalog. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems. {\bf G.2.2} Mathematics of Computing, DISCRETE MATHEMATICS, Graph Theory.", } @InProceedings{Christodoulakis:1989:RPV, author = "Stavros Christodoulakis and Daniel Alexander Ford", title = "Retrieval performance versus disc space utilization on {WORM} optical discs", crossref = "Clifford:1989:PAS", pages = "306--314", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p306-christodoulakis/p306-christodoulakis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p306-christodoulakis/", abstract = "Steady progress in the development of optical disc technology over the past decade has brought it to the point where it is beginning to compete directly with magnetic disc technology. WORM optical discs in particular, which permanently register information on the disc surface, have significant advantages over magnetic technology for applications that are mainly archival in nature but require the ability to do frequent on-line insertions. \par In this paper, we propose a class of access methods that use rewritable storage for the temporary buffering of insertions to data sets stored on WORM optical discs and we examine the relationship between the retrieval performance from WORM optical discs and the utilization of disc storage space when one of these organizations is employed. We describe the performance trade off as one of fast sequential retrieval of the contents of a block versus wasted space owing to data replication. A model of a specific instance of such an organization (a buffered hash file scheme) is described that allows for the specification of retrieval performance objectives. Alternative strategies for managing data replication that allow trade offs between higher consumption rates and better average retrieval performance are also described. We then provide an expected value analysis of the amount of disc space that must be consumed on a WORM disc to meet specified performance limits. The analysis is general enough to allow easy extension to other types of buffered files systems for WORM optical discs.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance", subject = "Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Access methods}; Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2): {\bf File organization}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3): {\bf Retrieval models}", } @InProceedings{Cosmadakis:1989:FOE, author = "S. S. Cosmadakis", title = "On the first-order expressibility of recursive queries", crossref = "ACM:1989:PPE", pages = "311--323", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p311-cosmadakis/p311-cosmadakis.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p311-cosmadakis/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p311-cosmadakis/", abstract = "A Datalog program is {\em bounded\/} iff it is equivalent to a recursion-free Datalog program. We show that, for some classes of Datalog programs, expressibility in first-order query languages coincides with boundedness. Our results imply that testing first-order expressibility is undecidable for binary programs, decidable for monadic programs, and complete for 0 2.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Performance", keywords = "design; languages; performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1)", } @InProceedings{Lomet:1989:AMM, author = "David Lomet and Betty Salzberg", title = "Access methods for multiversion data", crossref = "Clifford:1989:PAS", pages = "315--324", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p315-lomet/p315-lomet.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p315-lomet/", abstract = "We present an access method designed to provide a single integrated index structure for a versioned timestamped database with a non-deletion policy. Historical data (superceded versions) is stored separately from current data. Our access method is called the {\em Time-Split B-tree}. It is an index structure based on Malcolm Easton's Write Once B-tree. \par The Write Once B-tree was developed for data stored entirely on a Write-Once Read-Many or {\em WORM\/} optical disk. The Time-Split B-tree differs from the Write Once B-tree in the following ways: \par Current data {\em must\/} be stored on an {\em erasable\/} random-access device. \par Historical data {\em may\/} be stored on {\em any\/} random-access device, including WORMs, erasable optical disks, and magnetic disks. The point is to use a faster and more expensive device for the current data and a slower cheaper device for the historical data. \par The splitting policies have been changed to reduce redundancy in the structure--the option of pure key splits as in B + -trees and a choice of split times for time-based splits enable this performance enhancement. \par When data is migrated from the current to the historical database, it is consolidated and appended to the end of the historical database, allowing for high space utilization in WORM disk sectors. \par ", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Information Storage and Retrieval --- Content Analysis and Indexing (H.3.1): {\bf Indexing methods}; Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2); Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Access methods}", } @InProceedings{Dublish:1989:EBA, author = "P. Dublish and S. N. Maheshwari", title = "Expressibility of bounded-arity fixed-point query hierarchies", crossref = "ACM:1989:PPE", pages = "324--335", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p324-dublish/p324-dublish.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p324-dublish/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p324-dublish/", abstract = "The expressibility of bounded-arity query hierarchies resulting from the extension of first-order logic by the least fixed-point, inductive fixed-point and generalized fixed-point operators is studied. In each case, it is shown that increasing the arity of the predicate variable from k to k+1 always allows some more k-ary predicates to be expressed. Further, k-ary inductive fixed-points are shown to be more expressive than k-ary least fixed-points and k-ary generalized fixed-points are shown to be more expressive than k-ary inductive fixed-points.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Theory", keywords = "algorithms; design; languages; theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Lambda calculus and related systems}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2)", } @InProceedings{Shekita:1989:PET, author = "Eugene J. Shekita and Michael J. Carey", title = "Performance enhancement through replication in an object-oriented {DBMS}", crossref = "Clifford:1989:PAS", pages = "325--336", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p325-shekita/p325-shekita.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p325-shekita/", abstract = "In this paper we describe how replicated data can be used to speedup query processing in an object-oriented database system. The general idea is to use replicated data to eliminate some of the functional joins that would otherwise be required for query processing. We refer to our technique for replicating data as {\em field replication\/} because it allows individual data fields to be selectively replicated. In the paper we describe how field replication can be specified at the data model level and we present storage-level mechanisms to efficiently support it. We also present an analytical cost model to give some feel for how beneficial field replication can be and the circumstances under which it breaks down. While field replication is a relatively simple notion, the analysis shows that it can provide significant performance gains in many situations.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Kedem:1989:RDB, author = "Z. M. Kedem and A. Tuzhilin", title = "Relational database behavior: utilizing relational discrete event systems and models", crossref = "ACM:1989:PPE", pages = "336--346", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p336-kedem/p336-kedem.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p336-kedem/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p336-kedem/", abstract = "Behavior of relational databases is studied within the framework of {\em Relational Discrete Event Systems\/} (RDE-Ses) and {\em Models\/} (RDEMs). Production system and recurrence equation RDEMs are introduced, and their expressive powers are compared. Non-deterministic behavior is defined for both RDEMs and the expressive power of deterministic and non-deterministic production rule programs is also compared. This comparison shows that non-determinism increases expressive power of production systems. A formal concept of a production system interpreter is defined, and several specific interpreters are proposed. One interpreter, called {\em parallel deterministic}, is shown to be better than others in many respects, including the conflict resolution module of OPS5.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance; Theory", keywords = "algorithms; design; performance; theory", subject = "{\bf H.2.6} Information Systems, DATABASE MANAGEMENT, Database Machines. {\bf F.1.2} Theory of Computation, COMPUTATION BY ABSTRACT DEVICES, Modes of Computation, Alternation and nondeterminism. {\bf H.2.3} Information Systems, DATABASE MANAGEMENT, Languages, Query languages. {\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems.", } @InProceedings{Kim:1989:COR, author = "Won Kim and Elisa Bertino and Jorge F. Garza", title = "Composite objects revisited", crossref = "Clifford:1989:PAS", pages = "337--347", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p337-kim/p337-kim.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p337-kim/", abstract = "In object-oriented systems, an object may recursively reference any number of other objects. The references, however, do not capture any special relationships between objects. An important semantic relationship which may be superimposed on a reference is the IS-PART-OF relationship between a pair of objects. A set of objects related by the IS-PART-OF relationship is collectively called a composite object. \par An earlier paper [KIM87b] presented a model of composite objects which has been implemented in the ORION object-oriented database system at MCC. Although the composite-object feature has been found quite useful, the model suffers from a number of serious shortcomings, primarily because it overloads a number of orthogonal semantics on the references. In this paper, first we present a more general model of composite objects which does not suffer from these shortcomings. Further, [KIM87b] made an important contribution by exploring the use of composite objects as a unit for versions, physical clustering, and concurrency control. The extended model of composite objects necessitates non-trivial changes to the results of [KIM87b]. This paper describes the new results on the use of composite objects as a unit of not only versions, physical clustering and concurrency control, but also authorization.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Information Storage and Retrieval --- Systems and Software (H.3.4): {\bf ORION}", } @InProceedings{Hull:1989:USI, author = "R. Hull and J. Su", title = "Untyped sets, invention, and computable queries", crossref = "ACM:1989:PPE", pages = "347--359", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p347-hull/p347-hull.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p347-hull/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p347-hull/", abstract = "Conventional database query languages are considered in the context of untyped sets. The algebra without while has the expressive power of the typed complex object algebra. The algebra plus while, and COL with untyped sets (under stratified semantics or inflationary semantics) have the power of the computable queries. The calculus has power beyond the computable queries; and is characterized using the typed complex object calculus with invention. The Bancilhon-Khoshafian calculus is also discussed. A technical tool, called ``generic Turing machine'', is introduced and used in several of the proofs.", acknowledgement = ack-nhfb, generalterms = "Design; Performance; Theory", keywords = "design; performance; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf F.3.1} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Specifying and Verifying and Reasoning about Programs, Logics of programs. {\bf H.2.1} Information Systems, DATABASE MANAGEMENT, Logical Design, Data models.", } @InProceedings{Chang:1989:EIS, author = "E. E. Chang and R. H. Katz", title = "Exploiting inheritance and structure semantics for effective clustering and buffering in an object-oriented {DBMS}", crossref = "Clifford:1989:PAS", pages = "348--357", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p348-chang/p348-chang.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p348-chang/", abstract = "Object-oriented databases provide new kinds of data semantics in terms of inheritance and structural relationships. This paper examines how to use these additional semantics to obtain more effective object buffering and clustering. We use the information collected from real-world object-oriented applications, the Berkeley CAD Group's OCT design tools, as the basis for a simulation model with which to investigate alternative buffering and clustering strategies. Observing from our measurements that real CAD applications exhibit high data read to write ratios, we propose a run-time clustering algorithm whose initial evaluation indicates that system response time can be improved by a factor of 200\% when the read/write ratio is high. We have also found it useful to limit the amount of I/O allowed to the clustering algorithm as it examines candidate pages for clustering at run-time. Basically, there is little performance distinction between limiting reclustering to a few I/Os or many, so a low limit on I/O appears to be acceptable. We also examine, under a variety of workload assumptions, context-sensitive buffer replacement policies with alternative prefetching policies.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance", subject = "Computer Applications --- Computer-Aided Engineering (J.6): {\bf Computer-aided design (CAD)}; Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2); Software --- Programming Languages --- Language Constructs and Features (D.3.3): {\bf Abstract data types}; Information Systems --- Database Management --- Systems (H.2.4)", } @InProceedings{Graefe:1989:DQE, author = "G. Graefe and K. Ward", title = "Dynamic query evaluation plans", crossref = "Clifford:1989:PAS", pages = "358--366", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p358-graefe/p358-graefe.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p358-graefe/", abstract = "In most database systems, a query embedded in a program written in a conventional programming language is optimized when the program is compiled. The query optimizer must make assumptions about the values of the program variables that appear as constants in the query, the resources that can be committed to query evaluation, and the data in the database. The optimality of the resulting query evaluation plan depends on the validity of these assumptions. If a query evaluation plan is used repeatedly over an extended period of time, it is important to determine when reoptimization is necessary. Our work aims at developing criteria when reoptimization is required, how these criteria can be implemented efficiently, and how reoptimization can be avoided by using a new technique called {\em dynamic query evaluation plans}. We experimentally demonstrate the need for dynamic plans and outline modifications to the EXODUS optimizer generator required for creating dynamic query evaluation plans.", acknowledgement = ack-nhfb, generalterms = "Languages; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Software --- Programming Languages --- Processors (D.3.4): {\bf Optimization}; Software --- Programming Languages --- Language Classifications (D.3.2): {\bf EXODUS}", } @InProceedings{Lecluse:1989:MCS, author = "C. L{\'e}cluse and P. Richard", title = "Modeling complex structures in object-oriented logic programming", crossref = "ACM:1989:PPE", pages = "360--368", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p360-lecluse/p360-lecluse.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p360-lecluse/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p360-lecluse/", abstract = "In this paper, we present a type model for object-oriented databases. Most object-oriented databases only provide users with flat objects whose structure is a record of other objects. In order to have a powerful expression power, an object-oriented database should not only provide objects but also complex values recursively built using the set, tuple and disjunctive constructors. Our type model presents two notions: that of classes whose instances are objects with identity and that of types whose instances are complex values. The two notions are mixed in that an object is modeled as a pair containing an identifier and a value, and a value is a complex structure which contains objects and values. We define in this context the notions of subtyping and provide a set inclusion semantics for subtyping.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance; Theory", keywords = "algorithms; design; performance; theory", subject = "{\bf F.3.3} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Studies of Program Constructs, Type structure. {\bf H.2.0} Information Systems, DATABASE MANAGEMENT, General. {\bf F.3.2} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Semantics of Programming Languages. {\bf F.4.1} Theory of Computation, MATHEMATICAL LOGIC AND FORMAL LANGUAGES, Mathematical Logic, Lambda calculus and related systems.", } @InProceedings{Swami:1989:OLJ, author = "A. Swami", title = "Optimization of large join queries: combining heuristics and combinatorial techniques", crossref = "Clifford:1989:PAS", pages = "367--376", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p367-swami/p367-swami.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p367-swami/", abstract = "We investigate the use of heuristics in optimizing queries with a large number of joins. Examples of such heuristics are the augmentation and local improvement heuristics described in this paper and a heuristic proposed by Krishnamurthy et al. We also study the combination of these heuristics with two general combinatorial optimization techniques, iterative improvement and simulated annealing, that were studied in a previous paper. Several interesting combinations are experimentally compared. For completeness, we also include simple iterative improvement and simulated annealing in our experimental comparisons. We find that two combinations of the augmentation heuristic and iterative improvement perform the best under most conditions. The results are validated using two different cost models and several different synthetic benchmarks.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Economics; Experimentation; Languages; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Mathematics of Computing --- Discrete Mathematics --- Combinatorics (G.2.1): {\bf Combinatorial algorithms}", } @InProceedings{Chen:1989:CLC, author = "W. Chen and D. S. Warren", title = "{C}-logic of complex objects", crossref = "ACM:1989:PPE", pages = "369--378", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p369-chen/p369-chen.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p369-chen/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p369-chen/", abstract = "Our objective is to have a logical framework for natural representation and manipulation of complex objects. We start with an analysis of semantic modeling of complex objects, and attempt to understand what are the fundamental aspects which need to be captured. A logic, called C-logic, is then presented which provides direct support for what we believe to be basic features of complex objects, including object identity, multi-valued labels and a dynamic notion of types. C-logic has a simple first-order semantics, but it also allows natural specification of complex objects and gives us a framework for exploring efficient logic deduction over complex objects.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance; Theory", keywords = "algorithms; design; performance; theory", subject = "Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2); Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Lambda calculus and related systems}; Information Systems --- Database Management --- General (H.2.0); Theory of Computation --- Logics and Meanings of Programs --- Specifying and Verifying and Reasoning about Programs (F.3.1)", } @InProceedings{Haas:1989:EQP, author = "L. M. Haas and J. C. Freytag and G. M. Lohman and H. Pirahesh", title = "Extensible query processing in starburst", crossref = "Clifford:1989:PAS", pages = "377--388", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p377-haas/p377-haas.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p377-haas/", abstract = "Today's DBMSs are unable to support the increasing demands of the various applications that would like to use a DBMS. Each kind of application poses new requirements for the DBMS. The Starburst project at IBM's Almaden Research Center aims to extend relational DBMS technology to bridge this gap between applications and the DBMS. While providing a full function relational system to enable sharing across applications, Starburst will also allow (sophisticated) programmers to add many kinds of extensions to the base system's capabilities, including language extensions (e.g., new datatypes and operations), data management extensions (e.g., new access and storage methods) and internal processing extensions (e.g., new join methods and new query transformations). To support these features, the database query language processor must be very powerful and highly extensible. Starburst's language processor features a powerful query language, rule-based optimization and query rewrite, and an execution system based on an extended relational algebra. In this paper, we describe the design of Starburst's query language processor and discuss the ways in which the language processor can be extended to achieve Starburst's goals.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Verification", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Numerical Algorithms and Problems (F.2.1)", } @InProceedings{Kifer:1989:LOO, author = "M. Kifer and J. Wu", title = "A logic for object-oriented logic programming", crossref = "ACM:1989:PPE", pages = "379--393", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p379-kifer/p379-kifer.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p379-kifer/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p379-kifer/", abstract = "We present a logic for reasoning about complex objects, which is a revised and significantly extended version of Maier's O-logic [Mai86]. The logic naturally supports complex objects, object identity, deduction, is tolerant to inconsistent data, and has many other interesting features. It elegantly combines the object-oriented and value-oriented paradigms and, in particular, contains all of the predicate calculus as a special case. Our treatment of sets is also noteworthy: it is more general than ELPS [Kup87] and COL [AbG87], yet it avoids the semantic problems encountered in LDL [BNS87]. The proposed logic has a sound and complete resolution-based proof procedure.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Theory", keywords = "design; languages; theory", subject = "Theory of Computation --- Logics and Meanings of Programs --- Specifying and Verifying and Reasoning about Programs (F.3.1): {\bf Logics of programs}; Information Systems --- Database Management --- General (H.2.0); Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2)", } @InProceedings{Tang:1989:SPS, author = "T. Tang and N. Natarajan", title = "A static pessimistic scheme for handling replicated databases", crossref = "Clifford:1989:PAS", pages = "389--398", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p389-tang/p389-tang.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p389-tang/", abstract = "A replicated database system may partition into isolated groups in the presence of node and link failures. When the system has partitioned, a {\em pessimistic scheme\/} maintains availability and consistency of replicated data by ensuring that updates occur in at most one group. A pessimistic scheme is called a {\em static scheme\/} if these {\em distinguished\/} groups are determined only by the membership of different groups in the partitioned system. In this paper, we present a new static scheme that is more powerful than voting. In this scheme, the set of distinguished groups, called an {\em acceptance set}, is chosen at design time. To commit an update, a node checks if its enclosing group is a member of this acceptance set. Using an encoding scheme for groups, this check is implemented very efficiently. Another merit of the proposed scheme is that the problem of determining an {\em optimal\/} acceptance set is formulated as a {\em sparse 0-1 linear programming problem}. Hence, the optimization problem can be handled using the very rich class of existing techniques for solving such problems. Based on our experiments, we feel that this optimization approach is feasible for systems containing up to 10 nodes (copies).", acknowledgement = ack-nhfb, generalterms = "Algorithms; Verification", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Numerical Algorithms and Problems (F.2.1); Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}", } @InProceedings{Borgida:1989:TSQ, author = "A. Borgida", title = "Type systems for querying class hierarchies with non-strict inheritance", crossref = "ACM:1989:PPE", pages = "394--400", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/73721/p394-borgida/p394-borgida.pdf; http://www.acm.org/pubs/citations/proceedings/pods/73721/p394-borgida/; http://www.acm.org:80/pubs/citations/proceedings/pods/73721/p394-borgida/", abstract = "Type checking at query compilation time is important for both detecting programmer errors and reducing the running time of queries. We have argued elsewhere [2] that entity-based data management systems which support class hierarchies, such as semantic data models and object-oriented dbms, should not be confined to have `` {\em strict inheritance\/} '' -- i.e., they should permit contradictions between class specifications, albeit in an explicit and controlled way. In this paper we present a type system for queries manipulating objects in such classes. We provide sound and complete axiomatizations of the predications ``{\em is a subtype of\/}'' and ``{\em expression $e$ has type\/}''. The absence of strict inheritance has normally been felt to preclude effective type checking. We show that the problem is co-NP-hard when disjoint types are admitted in the schema, but present a low-order polynomial-time algorithm that determines the absence of type errors in a query when the database has only entities.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Theory", keywords = "design; languages; theory", subject = "{\bf H.2.4} Information Systems, DATABASE MANAGEMENT, Systems, Query processing. {\bf D.3.4} Software, PROGRAMMING LANGUAGES, Processors, Compilers. {\bf F.3.3} Theory of Computation, LOGICS AND MEANINGS OF PROGRAMS, Studies of Program Constructs, Type structure.", } @InProceedings{Ellis:1989:CCG, author = "C. A. Ellis and S. J. Gibbs", title = "Concurrency control in groupware systems", crossref = "Clifford:1989:PAS", pages = "399--407", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p399-ellis/p399-ellis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p399-ellis/", abstract = "Groupware systems are computer-based systems that support two or more users engaged in a common task, and that provide an interface to a shared environment. These systems frequently require fine-granularity sharing of data and fast response times. This paper distinguishes real-time groupware systems from other multi-user systems and discusses their concurrency control requirements. An algorithm for concurrency control in real-time groupware systems is then presented. The advantages of this algorithm are its simplicity of use and its responsiveness: users can operate directly on the data without obtaining locks. The algorithm must know some semantics of the operations. However the algorithm's overall structure is independent of the semantic information, allowing the algorithm to be adapted to many situations. An example application of the algorithm to group text editing is given, along with a sketch of its proof of correctness in this particular case. We note that the behavior desired in many of these systems is non-serializable.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Human Factors", subject = "Information Systems --- Models and Principles --- User/Machine Systems (H.1.2): {\bf Human factors}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Computer Applications --- Computers in Other Systems (J.7): {\bf Real time}", } @InProceedings{Agrawal:1989:MSM, author = "D. Agrawal and S. Sengupta", title = "Modular synchronization in multiversion databases: version control and concurrency control", crossref = "Clifford:1989:PAS", pages = "408--417", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p408-agrawal/p408-agrawal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p408-agrawal/", abstract = "In this paper we propose a version control mechanism that enhances the modularity and extensibility of multiversion concurrency control algorithms. We decouple the multiversion algorithms into two components: version control and concurrency control. This permits modular development of multiversion protocols, and simplifies the task of proving the correctness of these protocols. An interesting feature of our framework is that the execution of read-only transactions becomes completely independent of the underlying concurrency control implementation. Also, algorithms with the version control mechanism have several advantages over most other multiversion algorithms.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Verification", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Database Administration (H.2.7): {\bf Logging and recovery}; Software --- Software Engineering --- Distribution, Maintenance, and Enhancement (D.2.7): {\bf Version control}", } @InProceedings{DeTroyer:1989:RTC, author = "O. {De Troyer}", title = "{RIDL}*: a tool for the computer-assisted engineering of large databases in the presence of integrity constraints", crossref = "Clifford:1989:PAS", pages = "418--429", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p418-de_troyer/p418-de_troyer.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p418-de_troyer/", abstract = "Tools and methods that transform higher level formalisms into logical database designs become very important. Rarely if ever do these transformations take into account integrity constraints existing in the ``conceptual'' model. Yet these become essential if one is forced to introduce redundancies for reasons of e.g., query efficiency. We therefore adopted the Binary Relationship Model (or ``NIAM'') that is rich in constraints and built a flexible tool, RIDL *, that graphically captures NIAM semantic networks, analyzes them and then transforms them into relational designs (normalized or not), under the control of a database engineer assisted by a rule base. This is made possible by a rule-driven implementation of a new, stepwise synthesis process, and its benefits are illustrated by its treatment of e.g., subtypes. RIDL * is operational at several industrial sites in Europe and the U.S. on sizable database projects.", acknowledgement = ack-nhfb, generalterms = "Design", subject = "Software --- Software Engineering --- Design Tools and Techniques (D.2.2): {\bf Programmer workbench**}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Schema and subschema}; Information Systems --- Database Management --- Logical Design (H.2.1); Computing Methodologies --- Computer Graphics --- Methodology and Techniques (I.3.6): {\bf Languages}", } @InProceedings{Markowitz:1989:CRE, author = "Victor M. Markowitz and Arie Shoshani", title = "On the correctness of representing extended entity-relationship structures in the relational model", crossref = "Clifford:1989:PAS", pages = "430--439", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p430-markowitz/p430-markowitz.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p430-markowitz/", abstract = "Although the relational representation of {\em Entity-Relationship\/} (ER) structures gained extensive coverage, scarce attention has been paid to the issue of {\em correctness\/} for such representations. Several mappings have been proposed for the representation of both ER and extended ER (EER) structures by relational schemas. The informal nature of most of these proposals, however, does not allow a precise evaluation of their correctness, nor a comparison of the various mappings. We propose a {\em canonical\/} relational representation for EER structures and prove its correctness. We claim that a relational schema represents correctly an EER structure if it has {\em equivalent\/} information-capacity with the corresponding canonical representation. \par The second problem addressed by this paper is the normalization of relational schemas that represent EER structures. We examine the conditions required by this process and show that ignoring these conditions leads to erroneous analyses and inappropriate design decisions. We show that, under these conditions, the canonical relational representation of any (unrestricted) EER structure has an (information-capacity) equivalent {\em Boyce-Codd Normal Form\/} schema.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance; Verification", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Schema and subschema}; Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2)", } @InProceedings{Navathe:1989:VPD, author = "Shamkant B. Navathe and Mingyoung Ra", title = "Vertical partitioning for database design: a graphical algorithm", crossref = "Clifford:1989:PAS", pages = "440--450", year = "1989", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/67544/p440-navathe/p440-navathe.pdf; http://www.acm.org/pubs/citations/proceedings/mod/67544/p440-navathe/", abstract = "Vertical partitioning is the process of subdividing the attributes of a relation or a record type, creating fragments. Previous approaches have used an iterative binary partitioning method which is based on clustering algorithms and mathematical cost functions. In this paper, however, we propose a new vertical partitioning algorithm using a graphical technique. This algorithm starts from the attribute affinity matrix by considering it as a complete graph. Then, forming a linearly connected spanning tree, it generates all meaningful fragments simultaneously by considering a cycle as a fragment. We show its computational superiority. It provides a cleaner alternative without arbitrary objective functions and provides an improvement over our previous work on vertical partitioning.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Graph algorithms}; Theory of Computation --- Computation by Abstract Devices --- Complexity Measures and Classes (F.1.3)", } @InProceedings{Lipton:1990:PSE, author = "Richard J. Lipton and Jeffrey F. Naughton and Donovan A. Schneider", title = "Practical selectivity estimation through adaptive sampling", crossref = "Garcia-Molina:1990:PAS", pages = "1--11", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p1-lipton/p1-lipton.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p1-lipton/", abstract = "Recently we have proposed an adaptive, random sampling algorithm for general query size estimation. In earlier work we analyzed the asymptotic efficiency and accuracy of the algorithm, in this paper we investigate its practicality as applied to selects and joins. First, we extend our previous analysis to provide significantly improved bounds on the amount of sampling necessary for a given level of accuracy. Next, we provide ``sanity bounds'' to deal with queries for which the underlying data is extremely skewed or the query result is very small. Finally, we report on the performance of the estimation algorithm as implemented in a host language on a commercial relational system. The results are encouraging, even with this loose coupling between the estimation algorithm and the DBMS.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Performance", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Mathematics of Computing --- Probability and Statistics (G.3): {\bf Probabilistic algorithms (including Monte Carlo)}", } @InProceedings{Kim:1990:RDO, author = "Won Kim", title = "Research directions in object-oriented database systems", crossref = "ACM:1990:PPN", pages = "1--15", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p1-kim/p1-kim.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p1-kim/", abstract = "The set of object-oriented concepts found in object-oriented programming languages forms a good basis for a data model for post-relational database systems which will extend the domain of database applications beyond conventional business data processing. However, despite the high level of research and development activities during the past several years, there is no standard object-oriented data model, and criticisms and concerns about the field still remain. In this paper, I will first provide a historical perspective on the emergence of object-oriented database systems in order to derive a definition of object-oriented database systems. I will then examine a number of major challenge which remain for researchers and implementors of object-oriented database systems.", acknowledgement = ack-nhfb, classification = "C6110 (Systems analysis and programming); C6160Z (Other DBMS)", corpsource = "Microelectron. and Comput. Technol. Corp., Austin, TX, USA", generalterms = "Design; Management; Performance; Standardization; Theory", keywords = "database management systems; object-oriented database systems; object-oriented programming", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Object-oriented databases}; Information Systems --- Information Storage and Retrieval --- Information Search and Retrieval (H.3.3); Computing Milieux --- The Computer Industry (K.1): {\bf Standards}", treatment = "B Bibliography; G General Review; P Practical", } @InProceedings{King:1990:BAT, author = "Roger King and Ali Morfeq", title = "Bayan: an {Arabic} text database management system", crossref = "Garcia-Molina:1990:PAS", pages = "12--23", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p12-king/p12-king.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p12-king/", abstract = "Most existing databases lack features which allow for the convenient manipulation of text. It is even more difficult to use them if the text language is not based on the Roman alphabet. The Arabic language is a very good example of this case. Many projects have attempted to use conventional database systems for Arabic data manipulation (including text data), but because of Arabic's many differences with English, these projects have met with limited success. In the Bayan project, the approach has been different. Instead of simply trying to adopt an environment to Arabic, the properties of the Arabic language were the starting point and everything was designed to meet the needs of Arabic, thus avoiding the shortcomings of other projects. A text database management system was designed to overcome the shortcomings of conventional database management systems in manipulating text data. Bayan's data model is based on an object-oriented approach which helps the extensibility of the system for future use. In Bayan, we designed the database with the Arabic text properties in mind. We designed it to support the way Arabic words are derived, classified, and constructed. Furthermore, linguistic algorithms (for word generation and morphological decomposition of words) were designed, leading to a formalization of rules of Arabic language writing and sentence construction. A user interface was designed on top of this environment. A new representation of the Arabic characters was designed, a complete Arabic keyboard layout was created, and a window-based Arabic user interface was also designed.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Computing Methodologies --- Document and Text Processing --- Document and Text Editing (I.7.1); Information Systems --- Database Management --- Database Applications (H.2.8); Computer Applications --- Arts and Humanities (J.5): {\bf Linguistics}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Abiteboul:1990:MS, author = "Serge Abiteboul and Paris C. Kanellakis and Emmanuel Waller", title = "Method schemas", crossref = "ACM:1990:PPN", pages = "16--27", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p16-abiteboul/p16-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p16-abiteboul/", abstract = "The concept of {\em method schemas\/} is proposed as a simple model for object-oriented programming with features such as {\em classes with methods and inheritance, method name overloading}, and {\em late binding}. An important issue is to check whether a given method schema can possibly lead to inconsistencies in some interpretations. The consistency problem for method schemas is studied. The problem is shown to be undecidable in general. Decidability is obtained for {\em monadic\/} and/or {\em recursion-free\/} method schemas. The effect of {\em covariance\/} is considered. The issues of incremental consistency checking and of a sound algorithm for the general case are briefly discussed.", acknowledgement = ack-nhfb, classification = "C4210 (Formal logic); C4250 (Database theory); C6110 (Systems analysis and programming); C6160Z (Other DBMS)", corpsource = "INRIA, Le Chesnay, France", generalterms = "Algorithms; Design; Languages; Management; Performance; Theory", keywords = "classes with methods and inheritance; covariance; database management systems; database theory; databases; decidability; incremental consistency checking; late binding; method name overloading; monadic method schemas; object-oriented programming; recursion-free method schemas; sound algorithm; undecidable", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Schema and subschema}; Software --- Programming Techniques --- Object-oriented Programming (D.1.5)", treatment = "P Practical; T Theoretical or Mathematical", } @InProceedings{Yu:1990:RDO, author = "Lin Yu and Daniel J. Rosenkrantz", title = "Representability of design objects by ancestor-controlled hierarchical specifications", crossref = "ACM:1990:PPN", pages = "28--39", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p28-yu/p28-yu.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p28-yu/", abstract = "A simple model, called a VDAG, is proposed for representing hierarchically specified design data in CAD database systems where there are to be alternate expansions of hierarchically specified modules. The model uses an ancestor-based expansion scheme to control which instances of submodules are to be placed within each instance of a given module. The approach is aimed at reducing storage space in engineering design database systems, and providing a means for designers to specify alternate expansions of a module. \par The expressive power of the VDAG model is investigated, and the set of design forests which are VDAG-generable is characterized. The problem of determining whether a given design forest is VDAG-generable is shown to be {\em NP\/} -complete, even when the height of the forest is bounded. However, it is shown that determining whether a given forest is VDAG-generable and producing such a VDAG if it exists, can be partitioned into a number of simpler subproblems, each of which may not be too computationally difficult in practice. Furthermore, for forests in a special natural class that has broad applicability, a polynomial time algorithm is provided that determines whether a given forest is VDAG-generable, and produces such a VDAG if it exists. However, we show that it is {\em NP\/} -hard to produce a minimum-sized such VDAG for forests in this special class, even when the height of the forest is bounded.", acknowledgement = ack-nhfb, classification = "C1160 (Combinatorial mathematics); C4240 (Programming and algorithm theory); C4250 (Database theory); C6160 (Database management systems (DBMS))", corpsource = "Dept. of Comput. Sci., State Univ. of New York, Albany, NY, USA", generalterms = "Design; Management; Performance; Theory; Verification", keywords = "ancestor- based expansion scheme; ancestor-controlled hierarchical specifications; bounded forest height; CAD database systems; computational complexity; database management systems; database theory; design data representation; design forests; design objects representation; hierarchically specified design data; hierarchically specified modules; NP-complete; NP-hard; polynomial time algorithm; trees (mathematics); VDAG model; VDAG- generable", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Computer Applications --- Computer-Aided Engineering (J.6); Information Systems --- Database Management --- Database Applications (H.2.8); Mathematics of Computing --- Discrete Mathematics --- General (G.2.0)", treatment = "P Practical; T Theoretical or Mathematical", } @InProceedings{Agrawal:1990:OGI, author = "R. Agrawal and N. H. Gehani and J. Srinivasan", title = "{OdeView}: the graphical interface to {Ode}", crossref = "Garcia-Molina:1990:PAS", pages = "34--43", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p34-agrawal/p34-agrawal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p34-agrawal/", abstract = "OdeView is the graphical front end for Ode, an object-oriented database system and environment. Ode's data model supports data encapsulation, type inheritance, and complex objects. OdeView provides facilities for examining the database schema (i.e., the object type or class hierarchy), examining class definitions, browsing objects, following chains of references starting from an object, synchronized browsing, displaying selected portions of objects (projection), and retrieving objects with specific characteristics (selection). \par OdeView does not need to know about the internals of Ode objects. Consequently, the internals of specific classes are not hardwired into OdeView and new classes can be added to the Ode database without requiring any changes to or recompilation of OdeView. Just as OdeView does not know about the object internals, class functions (methods) for displaying objects are written without knowing about the specifics of the windowing software used by OdeView or the graphical user interface provided by it. \par In this paper, we present OdeView, and discuss its design and implementation.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Computing Methodologies --- Computer Graphics --- Methodology and Techniques (I.3.6): {\bf Interaction techniques}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4); Information Systems --- Database Management --- Languages (H.2.3); Software --- Programming Languages --- Language Classifications (D.3.2): {\bf C++}", } @InProceedings{Lipton:1990:QSE, author = "Richard J. Lipton and Jeffrey F. Naughton", title = "Query size estimation by adaptive sampling (extended abstract)", crossref = "ACM:1990:PPN", pages = "40--46", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p40-lipton/p40-lipton.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p40-lipton/", abstract = "We present an adaptive, random sampling algorithm for estimating the size of general queries. The algorithm can be used for any query {$Q$} over a database {$D$} such that (1) for some $n$, the answer to {$Q$} can be partitioned into $n$ disjoint subsets {$Q$} 1, {$Q$} 2, ..., {\em Q n}, and (2) for 1 $i$ $n$, the size of {\em Q i\/} is bounded by some function $b$ ( {\em D, Q\/}), and (3) there is some algorithm by which we can compute the size of {\em Q i}, where {$i$} is chosen randomly. We consider the performance of the algorithm on three special cases of the algorithm: join queries, transitive closure queries, and general recursive Datalog queries.", acknowledgement = ack-nhfb, annote = "36 papers; See also 6836.1508 1990 9th for papers", classification = "C4250 (Database theory); C6160 (Database management systems (DBMS))", corpsource = "Dept. of Comput. Sci., Princeton Univ., NJ, USA", generalterms = "Algorithms; Design; Management; Performance; Theory; Verification", keywords = "ACM; adaptive sampling; database; database systems; database theory; disjoint subsets; general recursive Datalog queries; join queries; performance; query languages; query size estimation; random sampling algorithm; SIGACT; transitive closure queries", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}", treatment = "T Theoretical or Mathematical", xxpages = "18--25", } @InProceedings{Ullman:1990:IOC, author = "Jeffrey D. Ullman and Mihalis Yannakakis", title = "The input\slash output complexity of transitive closure", crossref = "Garcia-Molina:1990:PAS", pages = "44--53", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p44-ullman/p44-ullman.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p44-ullman/", abstract = "Suppose a directed graph has its arcs stored in secondary memory, and we wish to compute its transitive closure, also storing the result in secondary memory. We assume that an amount of main memory capable of holding $s$ ``values'' is available, and that $s$ lies between $n$, the number of nodes of the graph, and $e$, the number of arcs. The cost measure we use for algorithms is the {\em I/O complexity\/} of Kung and Hong, where we count 1 every time a value is moved into main memory from secondary memory, or vice versa. \par In the dense case, where $e$ is close to $n^2$, we show that I/O equal to $(n^3 / s)$ is sufficient to compute the transitive closure of an $n$ -node graph, using main memory of size $s$. Moreover, it is necessary for any algorithm that is ``standard,'' in a sense to be defined precisely in the paper. Roughly, ``standard'' means that paths are constructed only by concatenating arcs and previously discovered paths. This class includes the usual algorithms that work for the generalization of transitive closure to semiring problems. For the sparse case, we show that I/O equal to $(n^2 e / s)$ is sufficient, although the algorithm we propose meets our definition of ``standard'' only if the underlying graph is acyclic. We also show that $(n^2 e / s)$ is necessary for any standard algorithm in the sparse case. That settles the I/O complexity of the sparse/acyclic case, for standard algorithms. It is unknown whether this complexity can be achieved in the sparse, cyclic case, by a standard algorithm, and it is unknown whether the bound can be beaten by nonstandard algorithms. \par We then consider a special kind of standard algorithm, in which paths are constructed only by concatenating arcs and old paths, never by concatenating two old paths. This restriction seems essential if we are to take advantage of sparseness. Unfortunately, we show that almost another factor of $n$ I/O is necessary. That is, there is an algorithm in this class using I/O $(n^3 e / s)$ for arbitrary sparse graphs, including cyclic ones. Moreover, every algorithm in the restricted class must use $(n^3 e / s / \log^3 n)$ I/O, on some cyclic graphs.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Theory", subject = "Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Computations on discrete structures}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2); Software --- Operating Systems --- Storage Management (D.4.2)", } @InProceedings{VanGelder:1990:DCA, author = "Allen {Van Gelder}", title = "Deriving constraints among argument sizes in logic programs (extended abstract)", crossref = "ACM:1990:PPN", pages = "47--60", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p47-van_gelder/p47-van_gelder.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p47-van_gelder/", abstract = "In a logic program the feasible argument sizes of derivable facts involving an $n$ -ary predicate are viewed as a set of points in the positive orthant of {\em R n}. We investigate a method of deriving constraints on the feasible set in the form of a polyhedral convex set in the positive orthant, which we call a {\em polycone}. Faces of this polycone represent inequalities proven to hold among the argument sizes. These inequalities are often useful for selecting an evaluation method that is guaranteed to terminate for a given logic procedure. The methods may be applicable to other languages in which the sizes of data structures can be determined syntactically. \par We introduce a {\em generalized Tucker representation\/} for systems of linear equations and show how needed operations on polycones are performed in this representation. We prove that every polycone has a unique {\em normal form\/} in this representation, and give an algorithm to produce it. This in turn gives a decision procedure for the question of whether two set of linear equations define the same polycone. \par When a predicate has several rules, the union of the individual rule's polycones gives the set of feasible argument size vectors for the predicate. Because this set is not necessarily convex, we instead operate with the smallest enclosing polycone, which is the closure of the convex hull of the union. Retaining convexity is one of the key features of our technique. \par Recursion is handled by finding a polycone that is a fixpoint of a transformation that is derived from both the recursive and nonrecursive rules. Some methods for finding a fixpoint are presented, but there are many unresolved problems in this area.", acknowledgement = ack-nhfb, classification = "C1110 (Algebra); C4140 (Linear algebra); C4210 (Formal logic); C4250 (Database theory)", corpsource = "California Univ., Santa Cruz, CA, USA", generalterms = "Algorithms; Design; Management; Performance; Theory; Verification", keywords = "$n$-ary predicate; argument sizes; constraint derivation; convex hull; convexity; database theory; decision procedure; derivable facts; feasible argument size vectors; fixpoint; formal logic; generalized Tucker representation; linear algebra; linear equations; logic programming; logic programs; nonrecursive rules; polycone; polyhedral convex set; positive orthant; recursive rules; transformation; unique normal form", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Computing Methodologies --- Artificial Intelligence --- Problem Solving, Control Methods, and Search (I.2.8): {\bf Heuristic methods}", treatment = "T Theoretical or Mathematical", } @InProceedings{Agrawal:1990:CSL, author = "D. Agrawal and A. {El Abbadi}", title = "Constrained Shared Locks for Increasing Concurrency in Databases", crossref = "ACM:1990:PPN", pages = "53--63", year = "1990", bibdate = "Mon Mar 16 09:51:33 MST 1998", bibsource = "http://www.math.utah.edu/pub/tex/bib/pods.bib", acknowledgement = ack-nhfb, annote = "36 papers; See also 6836.1508 1990 9th for papers", keywords = "ACM; database systems; SIGACT", } @InProceedings{Shen:1990:IEE, author = "Yeh-Heng Shen", title = "{IDLOG}: extending the expressive power of deductive database languages", crossref = "Garcia-Molina:1990:PAS", pages = "54--63", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p54-shen/p54-shen.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p54-shen/", abstract = "The expressive power of pure deductive database languages, such as {\em DATALOG\/} and {\em stratified DATALOGS}, is limited in a sense that some useful queries such as functions involving {\em aggregation\/} are not definable in these languages. Our concern in this paper is to provide a uniform logic framework for deductive databases with greater expressive power. It has been shown that with a linear ordering on the domain of the database, the expressive power of some database languages can be enhanced so that some functions involving aggregation can be defined. Yet, a direct implementation of the linear ordering in deductive database languages may seem unintuitive, and may not be very efficient to use in practice. We propose a logic for deductive databases which employs the notion of ``identifying each tuple in a relation''. Through the use of these {\em tuple-identifications}, different linear orderings are defined as a result. This intuitively explains the reason why our logic has greater expressive power. The proposed logic language is {\em non-deterministic\/} in nature. However, non-determinism is not the real reason for the enhanced expressive power. A deterministic subset of the programs in this language is {\em computational complete\/} in the sense that it defines all the {\em computable deterministic queries}. Although the problem of deciding whether a program is in this subset is in general undecidable, we do provide a rather general sufficient test for identifying such programs. Also discussed in this paper is an extended notion of queries which allows both the input and the output of a query to contain {\em interpreted constants\/} of an infinite domain. We show that extended queries involving aggregation can also be defined in the language.", acknowledgement = ack-nhfb, generalterms = "Design; Languages", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Computability theory}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}", } @InProceedings{Kolaitis:1990:EPD, author = "Phokion G. Kolaitis and Moshe Y. Vardi", title = "On the Expressive Power of {Datalog}: Tools and a Case Study", crossref = "ACM:1990:PPN", pages = "61--71", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p61-kolaitis/p61-kolaitis.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p61-kolaitis/", abstract = "We study here the language Datalog(), which is the query language obtained from Datalog by allowing equalities and inequalities in the bodies of the rules. We view Datalog() as a fragment of an infinitary logic {$L$} and show that {$L$} can be characterized in terms of certain two-person pebble games. This characterization provides us with tools for investigating the expressive power of Datalog(). As a case study, we classify the expressibility of {\em fixed subgraph homeomorphism\/} queries on directed graphs. Fortune et al. [FHW80] classified the computational complexity of these queries by establishing two dichotomies, which are proper only if P NP. Without using any complexity-theoretic assumptions, we show here that the two dichotomies are indeed proper in terms of expressibility in Datalog().", acknowledgement = ack-nhfb, annote = "36 papers; See also 6836.1508 1990 9th for papers", classification = "C1160 (Combinatorial mathematics); C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory)", corpsource = "California Univ., Santa Cruz, CA, USA", generalterms = "Design; Languages; Management; Performance; Theory; Verification", keywords = "ACM; classify; computational complexity; database systems; database theory; Datalog; Datalog(not=); directed graphs; equalities; expressibility; expressive power; fixed subgraph homeomorphism queries; formal logic; inequalities; infinitary logic; P not=NP; query language; SIGACT; tools; two-person pebble games", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}", treatment = "T Theoretical or Mathematical", xxpages = "110--134", } @InProceedings{Saraiya:1990:HPS, author = "Yatin P. Saraiya", title = "Hard problems for simple logic programs", crossref = "Garcia-Molina:1990:PAS", pages = "64--73", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p64-saraiya/p64-saraiya.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p64-saraiya/", abstract = "A number of optimizations have been proposed for Datalog programs involving a single intensional predicate (``single-IDB programs''). Examples include the detection of {\em commutativity\/} and {\em separability\/} ([Naug88],[RSUV89], [Ioan89a]) in linear logic programs, and the detection of {\em ZYT-linearizability\/} ([ZYT88], [RSUV89], [Sara89], [Sara90]) in nonlinear programs. We show that the natural generalizations of the commutativity and ZYT-linearizability problems (respectively, the {\em sequencability\/} and {\em base-case linearizability\/} problems) are undecidable. Our constructions involve the simulation of context-free grammars using single-IDB programs that have a bounded number of initialisation rules. The constructions may be used to show that containment (or equivalence) is undecidable for such programs, even if the programs are linear, or if each program contains a single recursive rule. These results tighten those of [Shmu87] and [Abit89].", acknowledgement = ack-nhfb, generalterms = "Algorithms; Languages", subject = "Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Mathematics of Computing --- Numerical Analysis --- Optimization (G.1.6): {\bf Linear programming}; Theory of Computation --- Mathematical Logic and Formal Languages --- Grammars and Other Rewriting Systems (F.4.2): {\bf Grammar types}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3)", } @InProceedings{Carey:1990:LCL, author = "Michael J. Carey and Sanjay Krishnamurthi and Miron Livny", title = "Load control for locking: the 'half-and-half' approach", crossref = "ACM:1990:PPN", pages = "72--84", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p72-carey/p72-carey.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p72-carey/", abstract = "A number of concurrency control performance studies have shown that, under high levels of data contention, concurrency control algorithms can exhibit thrashing behavior which is detrimental to overall system performance. In this paper, we present an approach to eliminating thrashing in the case of two-phase locking, a widely used concurrency control algorithm. Our solution, which we call the `Half-and-Half' Algorithm, involves monitoring the state of the DBMS in order to dynamically control the multiprogramming level of the system. Results from a performance study indicate that the Half-and-Half algorithm can be very effective at preventing thrashing under a wide range of operating conditions and workloads.", acknowledgement = ack-nhfb, classification = "C6150J (Operating systems); C6160B (Distributed DBMS)", corpsource = "Dept. of Comput. Sci., wisconsin Univ., Madison, WI, USA", generalterms = "Algorithms; Design; Experimentation; Management; Measurement; Performance; Theory", keywords = "concurrency control; concurrency control algorithms; DBMS; dynamically control; half-and-half algorithm; load control; multiprogramming; multiprogramming level; two-phase locking", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Physical Design (H.2.2)", treatment = "P Practical", } @InProceedings{Wang:1990:PTD, author = "Ke Wang", title = "Polynomial time designs toward both {BCNF} and efficient data manipulation", crossref = "Garcia-Molina:1990:PAS", pages = "74--83", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p74-wang/p74-wang.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p74-wang/", abstract = "We define the independence-reducibility based on a modification of key dependencies, which has better computational properties and is more practically useful than the original one based on key dependencies. Using this modification as a tool, we design BCNF databases that are highly desirable with respect to updates and/or query answering. In particular, given a set U of attributes and a set F of functional dependencies over U, we characterize when F can be embedded in a database scheme over U that is independent and is BCNF with respect to F, a polynomial time algorithm that tests this characterization and produces such a database scheme whenever possible is presented. The produced database scheme contains the fewest possible number of relation schemes. Then we show that designs of embedding constant-time-maintainable BCNF schemes and of embedding independence-reducible schemes share exactly the same method with the above design. Finally, a simple modification of this method yields a polynomial time algorithm for designing embedding separable BCNF schemes.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Theory of Computation --- Computation by Abstract Devices --- Complexity Measures and Classes (F.1.3): {\bf Reducibility and completeness}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Normal forms}", } @InProceedings{Atzeni:1990:EUI, author = "Paolo Atzeni and Riccardo Torlone", title = "Efficient updates to independent schemes in the weak instance model", crossref = "Garcia-Molina:1990:PAS", pages = "84--93", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p84-atzeni/p84-atzeni.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p84-atzeni/", abstract = "{\em The weak instance model is a framework to consider the relations in a database as a whole, regardless of the way attributes are grouped in the individual relations. Queries and updates can be performed involving any set of attributes. The management of updates is based on a lattice structure on the set of legal states, and inconsistencies and ambiguities can arise\/} \par {\em In the general case, the test for inconsistency and determinism may involve the application of the chase algorithm to the whole database. In this paper it is shown how, for the highly significant class of independent schemes, updates can be handled efficiently, considering only the relevant portion of the database}.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- General (F.2.0)", } @InProceedings{Agrawal:1990:LCS, author = "Divyakant Agrawal and Amr {El Abbadi}", title = "Locks with constrained sharing (extended abstract)", crossref = "ACM:1990:PPN", pages = "85--93", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p85-agrawal/p85-agrawal.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p85-agrawal/", abstract = "In this paper, we propose a new mode for locks that permits sharing in a constrained manner. We develop a family of locking protocols, the strictest of which is the two phase locking protocol while the most permissive recognizes all conflict-preserving serializable histories. This is the first locking-based protocol that can recognize the entire class of conflict-preserving serializable histories.", acknowledgement = ack-nhfb, classification = "B6150 (Communication system theory); C6160B (Distributed DBMS)", corpsource = "Dept. of Comput. Sci., California Univ., Santa Barbara, CA, USA", generalterms = "Design; Management; Performance; Reliability; Standardization; Theory; Verification", keywords = "concurrency control; conflict-preserving serializable histories; constrained sharing; distributed databases; locks; protocols; two phase locking protocol", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Computer Systems Organization --- Computer-Communication Networks --- Network Protocols (C.2.2); Information Systems --- Database Management --- Physical Design (H.2.2); Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}", treatment = "P Practical; T Theoretical or Mathematical", } @InProceedings{Saraiya:1990:ETD, author = "Y. P. Saraiya", title = "On the Efficiency of Transforming Database Logic Programs", crossref = "ACM:1990:PPN", pages = "87--109", year = "1990", bibdate = "Mon Mar 16 09:51:33 MST 1998", bibsource = "http://www.math.utah.edu/pub/tex/bib/pods.bib", acknowledgement = ack-nhfb, annote = "36 papers; See also 6836.1508 1990 9th for papers", keywords = "ACM; database systems; SIGACT", } @InProceedings{Salzberg:1990:FDS, author = "Betty Salzberg and Alex Tsukerman and Jim Gray and Michael Stuewart and Susan Uren and Bonnie Vaughan", title = "{FastSort}: a distributed single-input single-output external sort", crossref = "Garcia-Molina:1990:PAS", pages = "94--101", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p94-salzberg/p94-salzberg.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p94-salzberg/", abstract = "External single-input single-output sorts can use multiple processors each with a large tournament replacement-selection in memory, and each with private disks to sort an input stream in linear elapsed time. Of course, increased numbers of processors, memories, and disks are required as the input file size grows. This paper analyzes the algorithm and reports the performance of an implementation.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance", subject = "Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Sorting and searching}; Mathematics of Computing --- Numerical Analysis --- General (G.1.0): {\bf Parallel algorithms}; Theory of Computation --- Computation by Abstract Devices --- Modes of Computation (F.1.2): {\bf Parallelism and concurrency}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Trees}", } @InProceedings{Fekete:1990:SGC, author = "Alan Fekete and Nancy Lynch and William E. Weihl", title = "A serialization graph construction for nested transactions", crossref = "ACM:1990:PPN", pages = "94--108", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p94-fekete/p94-fekete.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p94-fekete/", abstract = "This paper makes three contributions. First, we present a proof technique that offers system designers the same ease of reasoning about nested transaction systems as is given by the classical theory for systems without nesting, and yet can be used to verify that a system satisfies the robust ``user view'' definition of correctness of [10]. Second, as applications of the technique, we verify the correctness of Moss' read/write locking algorithm for nested transactions, and of an undo logging algorithm that has not previously been presented or proved for nested transaction systems. Third, we make explicit the assumptions used for this proof technique, assumptions that are usually made {\em implicitly\/} in the classical theory, and therefore we clarify the type of system for which the classical theory itself can reliably be used.", acknowledgement = ack-nhfb, classification = "C1160 (Combinatorial mathematics); C4250 (Database theory); C6160B (Distributed DBMS)", corpsource = "Sydney Univ., NSW, Australia", generalterms = "Algorithms; Design; Management; Performance; Reliability; Theory; Verification", keywords = "concurrency control; database theory; distributed databases; graph theory; Moss read/write locking algorithm; nested transactions; proof technique; serialization graph construction; transaction processing; undo logging algorithm; user view definition of correctness", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}", treatment = "P Practical; T Theoretical or Mathematical", } @InProceedings{Graefe:1990:EPV, author = "Goetz Graefe", title = "Encapsulation of parallelism in the {Volcano} query processing system", crossref = "Garcia-Molina:1990:PAS", pages = "102--111", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p102-graefe/p102-graefe.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p102-graefe/", abstract = "Volcano is a new dataflow query processing system we have developed for database systems research and education. The uniform interface between operators makes Volcano extensible by new operators. All operators are designed and coded as if they were meant for a single-process system only. When attempting to parallelize Volcano, we had to choose between two models of parallelization, called here the {\em bracket\/} and {\em operator\/} models. We describe the reasons for not choosing the bracket model, introduce the novel operator model, and provide details of Volcano's {\em exchange\/} operator that parallelizes all other operators. It allows intra-operator parallelism on partitioned datasets and both vertical and horizontal inter-operator parallelism. The exchange operator encapsulates all parallelism issues and therefore makes implementation of parallel database algorithms significantly easier and more robust. Included in this encapsulation is the translation between demand-driven dataflow within processes and data-driven dataflow between processes. Since the interface between Volcano operators is similar to the one used in ``real,'' commercial systems, the techniques described here can be used to parallelize other query processing engines.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Theory of Computation --- Computation by Abstract Devices --- Modes of Computation (F.1.2): {\bf Parallelism and concurrency}; Mathematics of Computing --- Numerical Analysis --- General (G.1.0): {\bf Parallel algorithms}", } @InProceedings{Weikum:1990:MLR, author = "Gerhard Weikum and Christof Hasse and Peter Broessler and Peter Muth", title = "Multi-level recovery", crossref = "ACM:1990:PPN", pages = "109--123", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p109-weikum/p109-weikum.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p109-weikum/", abstract = "Multi-level transactions have received considerable attention as a framework for high-performance concurrency control methods. An inherent property of multi-level transactions is the need for compensating actions, since state-based recovery methods do no longer work correctly for transaction undo. The resulting requirement of operation logging adds to the complexity of crash recovery. In addition, multi-level recovery algorithms have to take into account that high-level actions are not necessarily atomic, e.g., if multiple pages are updated in a single action. \par In this paper, we present a recovery algorithm for multi-level transactions. Unlike typical commercial database systems, we have striven for simplicity rather than employing special tricks. It is important to note, though, that simplicity is not achieved at the expense of performance. We show how a high-performance multi-level recovery algorithm can be systematically developed based on few fundamental principles. The presented algorithm has been implemented in the DASDBS database kernel system.", acknowledgement = ack-nhfb, classification = "C6160B (Distributed DBMS)", corpsource = "Dept. of Comput. Sci., ETH Zurich, Switzerland", generalterms = "Algorithms; Design; Management; Performance; Theory", keywords = "concurrency control; DASDBS database kernel system; multi-level recovery algorithm; multi-level transactions; transaction processing", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Physical Design (H.2.2): {\bf Recovery and restart}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}", treatment = "P Practical", } @InProceedings{Bernstein:1990:IRR, author = "Philip A. Bernstein and Meichun Hsu and Bruce Mann", title = "Implementing recoverable requests using queues", crossref = "Garcia-Molina:1990:PAS", pages = "112--122", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p112-bernstein/p112-bernstein.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p112-bernstein/", abstract = "Transactions have been rigorously defined and extensively studied in the database and transaction processing literature, but little has been said about the handling of the {\em requests\/} for transaction execution in commercial TP systems, especially distributed ones, managing the flow of requests is often as important as executing the transactions themselves. \par This paper studies fault-tolerant protocols for managing the flow of transaction requests between clients that issue requests and servers that process them. We discuss how to implement these protocols using transactions and {\em recoverable queuing systems}. Queuing systems are used to move requests reliably between clients and servers. The protocols use queuing systems to ensure that the server processes each request exactly once and that a client processes each reply at least once. We treat request-reply protocols for single-transaction requests, for multi-transaction requests, and for requests that require interaction with the display after the request is submitted.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Reliability; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Distributed databases}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Mathematics of Computing --- Miscellaneous (G.m): {\bf Queueing theory**}", } @InProceedings{Solworth:1990:WOD, author = "Jon A. Solworth and Cyril U. Orji", title = "Write-only disk caches", crossref = "Garcia-Molina:1990:PAS", pages = "123--132", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p123-solworth/p123-solworth.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p123-solworth/", abstract = "With recent declines in the cost of semiconductor memory and the increasing need for high performance I/O disk systems, it makes sense to consider the design of large caches. In this paper, we consider the effect of caching writes. We show that cache sizes in the range of a few percent allow writes to be performed at negligible or no cost and independently of locality considerations.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Performance", subject = "Hardware --- Memory Structures --- Design Styles (B.3.2): {\bf Cache memories}; Software --- Operating Systems --- Storage Management (D.4.2): {\bf Secondary storage}; Information Systems --- Database Management --- Systems (H.2.4); Software --- Operating Systems --- Process Management (D.4.1): {\bf Scheduling}", } @InProceedings{Tay:1990:OSM, author = "Y. C. Tay", title = "On the optimality of strategies for multiple joins", crossref = "ACM:1990:PPN", pages = "124--131", year = "1990", bibdate = "Wed Oct 25 08:47:37 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p124-tay/p124-tay.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p124-tay/", acknowledgement = ack-nhfb, classification = "C4250 (Database theory); C6160D (Relational DBMS)", corpsource = "Dept. of Math., Nat. Univ. of Singapore, Kent Ridge, Singapore", keywords = "database theory; expression evaluation; multiple joins; orderings; relational databases; relations; searched subspace; strategy optimality; tuples", sponsororg = "SIGACT; SIGMOD; SIGART", treatment = "T Theoretical or Mathematical", } @InProceedings{Saraiya:1990:PTP, author = "Yatin P. Saraiya", title = "Polynomial-time program transformations in deductive databases", crossref = "ACM:1990:PPN", pages = "132--144", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p132-saraiya/p132-saraiya.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p132-saraiya/", abstract = "We investigate the complexity of various optimization techniques for logic databases. In particular, we provide polynomial-time algorithms for restricted versions of common program transformations, and show that a minor relaxation of these restrictions leads to {\em NP\/} -hardness. To this end, we define the $k$ -containment problem on conjunctive queries, and show that while the 2-containment problem is in {\em P}, the 3-containment problem is {\em NP\/} -complete. These results provide a complete description of the complexity of conjunctive query containment. We also extend these results to provide a natural characterization of certain optimization problems in logic databases, such as the detection of sequencability and commutativity among pairs of Linear rules, the detection of 1-boundedness in sirups, and the detection of ZYT-linearizability in simple nonlinear recursions.", acknowledgement = ack-nhfb, classification = "C1180 (Optimisation techniques); C1230 (Artificial intelligence); C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory); C6160Z (Other DBMS)", corpsource = "Dept. of Comput. Sci., Stanford Univ., CA, USA", generalterms = "Algorithms; Design; Management; Performance; Theory; Verification", keywords = "1-boundedness; 2- containment problem; 3-containment problem; commutativity; complexity; computational complexity; conjunctive query containment; database management systems; database theory; deductive databases; formal logic; k-containment problem; knowledge based systems; linear rules; logic databases; logic programming; nonlinear recursions; NP-complete; NP-hardness; optimisation; optimization; polynomial time program transformations; polynomial-time algorithms; query languages; sequencability; sirups; ZYT- linearizability", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3); Information Systems --- Database Management --- Database Applications (H.2.8); Computing Methodologies --- Artificial Intelligence --- Automatic Programming (I.2.2): {\bf Program transformation}; Mathematics of Computing --- Numerical Analysis --- Optimization (G.1.6)", treatment = "T Theoretical or Mathematical", } @InProceedings{Wolfson:1990:NPP, author = "Ouri Wolfson and Aya Ozeri", title = "A new paradigm for parallel and distributed rule-processing", crossref = "Garcia-Molina:1990:PAS", pages = "133--142", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p133-wolfson/p133-wolfson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p133-wolfson/", abstract = "This paper is concerned with the parallel evaluation of datalog rule programs, mainly by processors that are interconnected by a communication network. We introduce a paradigm, called data-reduction, for the parallel evaluation of a general datalog program. Several parallelization strategies discussed previously in [CW, GST, W, WS] are special cases of this paradigm. The paradigm parallelizes the evaluation by partitioning among the processors the instantiations of the rules. After presenting the paradigm, we discuss the following issues, that we see fundamental for parallelization strategies derived from the paradigm properties of the strategies that enable a reduction in the communication overhead, decomposability, load balancing, and application to programs with negation. We prove that decomposability, a concept introduced previously in [WS, CW], is undecidable.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Mathematics of Computing --- Numerical Analysis --- General (G.1.0): {\bf Parallel algorithms}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}", } @InProceedings{Ganguly:1990:FPP, author = "Sumit Ganguly and Avi Silberschatz and Shalom Tsur", title = "A framework for the parallel processing of {Datalog} queries", crossref = "Garcia-Molina:1990:PAS", pages = "143--152", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p143-ganguly/p143-ganguly.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p143-ganguly/", abstract = "This paper presents several complementary methods for the parallel, bottom-up evaluation of Datalog queries. We introduce the notion of a {\em discriminating predicate}, based on hash functions, that partitions the computation between the processors in order to achieve parallelism. A parallelization scheme with the property of non-redundant computation (no duplication of computation by processors) is then studied in detail. The mapping of Datalog programs onto a network of processors, such that the results is a non-redundant computation, is also studied. The methods reported in this paper clearly demonstrate the trade-offs between redundancy and interprocessor-communication for this class of problems.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Computation by Abstract Devices --- Modes of Computation (F.1.2): {\bf Parallelism and concurrency}; Theory of Computation --- Computation by Abstract Devices --- Complexity Measures and Classes (F.1.3)", } @InProceedings{Plambeck:1990:STR, author = "Thane Plambeck", title = "Semigroup techniques in recursive query optimization", crossref = "ACM:1990:PPN", pages = "145--153", year = "1990", bibdate = "Wed Oct 25 08:47:37 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p145-plambeck/p145-plambeck.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p145-plambeck/", acknowledgement = ack-nhfb, classification = "C1110 (Algebra); C1160 (Combinatorial mathematics); C1180 (Optimisation techniques); C4250 (Database theory); C6160 (Database management systems (DBMS))", corpsource = "Dept. of Comput. Sci., Stanford Univ., CA, USA", keywords = "codify; database theory; group theory; mathematical semigroup theory; optimisation; program boundedness; query languages; recursive query optimization; rule commutativity; set theory", sponsororg = "SIGACT; SIGMOD; SIGART", treatment = "T Theoretical or Mathematical", } @InProceedings{Kogan:1990:CCM, author = "Boris Kogan and S. Jajodia", title = "Concurrency control in multilevel-secure databases based on replicated architecture", crossref = "Garcia-Molina:1990:PAS", pages = "153--162", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p153-kogan/p153-kogan.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p153-kogan/", abstract = "In a multilevel secure database management system based on the {\em replicated\/} architecture, there is a separate database management system to manage data at or below each security level, and lower level data are replicated in all databases containing higher level data. In this paper, we address the open issue of concurrency control in such a system. We give a secure protocol that guarantees one-copy serializability of concurrent transaction executions and can be implemented in such a way that the size of the trusted code (including the code required for concurrency and recovery) is small.", acknowledgement = ack-nhfb, generalterms = "Design; Security", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- General (H.2.0): {\bf Security, integrity, and protection**}; Computer Applications --- Computers in Other Systems (J.7): {\bf Military}", } @InProceedings{Elkan:1990:ILD, author = "Charles Elkan", title = "Independence of logic database queries and updates", crossref = "ACM:1990:PPN", pages = "154--160", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p154-elkan/p154-elkan.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p154-elkan/", abstract = "A query is independent of an update if executing the update cannot change the result of evaluating the query. The theorems of this paper give methods for proving independence in concrete cases, taking into account integrity constraints, recursive rules, and arbitrary queries. First we define the notion of independence model-theoretically, and we prove basic properties of the concept. Then we provide proof-theoretic conditions for a conjunctive query to be independent of an update. Finally, we prove correct an induction scheme for showing that a recursive query is independent of an update.", acknowledgement = ack-nhfb, classification = "C4210 (Formal logic); C4250 (Database theory); C6160 (Database management systems (DBMS))", corpsource = "Dept. of Comput. Sci., Toronto Univ., Ont., Canada", generalterms = "Design; Management; Performance; Theory; Verification", keywords = "arbitrary queries; conjunctive query; database theory; formal logic; independence; induction; integrity constraints; logic database queries; logic database update; proof-theoretic conditions; query languages; recursive query; recursive rules", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Database Applications (H.2.8)", treatment = "T Theoretical or Mathematical", } @InProceedings{Ross:1990:MSM, author = "Kenneth A. Ross", title = "Modular stratification and magic sets for Datalog programs with negation", crossref = "ACM:1990:PPN", pages = "161--171", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p161-ross/p161-ross.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p161-ross/", abstract = "We propose a class of programs, called modularly stratified programs that have several attractive properties. Modular stratification generalizes stratification and local stratification, while allowing programs that are not expressible by stratified programs. For modularly stratified programs the well-founded semantics coincides with the stable model semantics, and makes every ground literal true or false. Modularly stratified programs are all weakly stratified, but the converse is false. Unlike some weakly stratified programs, modularly stratified programs can be evaluated in a subgoal-at-a-time fashion. We demonstrate a technique for rewriting a modularly stratified program for bottom-up evaluation and extend this rewriting to include magic-set techniques. The rewritten program, when evaluated bottom-up, gives the same answers as the well-founded semantics. We discuss extending modular stratification to other operators such as set-grouping and aggregation that have traditionally been stratified to prevent semantic difficulties.", acknowledgement = ack-nhfb, classification = "C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory)", corpsource = "Stanford Univ., CA, USA", generalterms = "Design; Languages; Management; Performance; Theory", keywords = "aggregation; bottom-up evaluation; database theory; Datalog programs; logic programming; magic sets; modular stratification; modularly stratified programs; negation; operators; programming theory; rewriting; rewriting systems; set-grouping", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Software --- Programming Techniques --- General (D.1.0); Information Systems --- Database Management --- Logical Design (H.2.1)", treatment = "T Theoretical or Mathematical", } @InProceedings{Badrinath:1990:PES, author = "B. R. Badrinath and Krithi Ramamritham", title = "Performance evaluation of semantics-based multilevel concurrency control protocols", crossref = "Garcia-Molina:1990:PAS", pages = "163--172", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p163-badrinath/p163-badrinath.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p163-badrinath/", abstract = "For next generation information systems, concurrency control mechanisms are required to handle high level abstract operations and to meet high throughput demands. The currently available single level concurrency control mechanisms for {\em reads\/} and {\em writes\/} are inadequate for future complex information systems. In this paper, we will present a new {\em multilevel\/} concurrency protocol that uses a semantics-based notion of conflict, which is weaker than commutativity, called {\em recoverability}. Further, operations are scheduled according to {\em relative conflict}, a conflict notion based on the structure of operations. \par Performance evaluation via extensive simulation studies show that with our multilevel concurrency control protocol, the performance improvement is significant when compared to that of a single level two-phase locking based concurrency control scheme or to that of a multilevel concurrency control scheme based on commutativity alone. Further, simulation studies show that our new multilevel concurrency control protocol performs better even with resource contention.", acknowledgement = ack-nhfb, generalterms = "Design; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Theory of Computation --- Computation by Abstract Devices --- Modes of Computation (F.1.2): {\bf Parallelism and concurrency}; Information Systems --- Database Management --- General (H.2.0): {\bf Security, integrity, and protection**}; Computer Applications --- Computers in Other Systems (J.7): {\bf Military}", } @InProceedings{You:1990:TVF, author = "Jia-Huai You and Li Yan Yuan", title = "Three-valued formalization of logic programming: is it needed?", crossref = "ACM:1990:PPN", pages = "172--182", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p172-you/p172-you.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p172-you/", abstract = "The central issue of this paper concerns the truth value {\em undefined\/} in Przymusinski's 3-valued formalization of nonmonotonic reasoning and logic programming. We argue that this formalization can lead to the problem of unintended semantics and loss of disjunctive information. We modify the formalization by proposing two general principles for logic program semantics: {\em justifiability\/} and {\em minimal undefinedness}. The former is shown to be a general property for almost all logic program semantics, and the latter requires the use of the undefined only when it is necessary. We show that there are three types of information embedded in the undefined: the disjunctive, the factoring, and the ``difficult-to-be-assigned''. In the modified formalization, the first two can be successfully identified and branched into multiple models. This leaves only the ``difficult-to-be-assigned'' as the undefined. It is shown that the truth value undefined is needed only for a very special type of programs whose practicality is yet to be evidenced.", acknowledgement = ack-nhfb, classification = "C1230 (Artificial intelligence); C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory)", corpsource = "Dept. of Comput. Sci., Alberta Univ., Edmonton, Alta., Canada", generalterms = "Design; Languages; Management; Performance; Theory; Verification", keywords = "database theory; difficult-to-be-assigned; disjunctive; disjunctive information; factoring; formal logic; justifiably; logic program semantics; logic programming; minimal undefinedness; nonmonotonic reasoning; programming theory; Przymusinski 3-valued formalization; ternary logic; truth value; unintended semantics", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Nonmonotonic reasoning and belief revision}; Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2); Information Systems --- Database Management --- Logical Design (H.2.1)", treatment = "T Theoretical or Mathematical", } @InProceedings{Motro:1990:QDK, author = "Amihai Motro and Qiuhui Yuan", title = "Querying database knowledge", crossref = "Garcia-Molina:1990:PAS", pages = "173--183", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p173-motro/p173-motro.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p173-motro/", abstract = "The role of database knowledge is usually limited to the evaluation of data queries. In this paper we argue that when this knowledge is of substantial volume and complexity, there is genuine need to query this repository of information. Moreover, since users of the database may not be able to distinguish between information that is data and information that is knowledge, access to knowledge and data should be provided with a single, coherent instrument. We provide an informal review of various kinds of knowledge queries, with possible syntax and semantics. We then formalize a framework of knowledge-rich databases, and a simple query language consisting of a pair of retrieve and describe statements. The retrieve statement is for querying the data (it corresponds to the basic retrieval statement of various knowledge-rich database systems). The describe statement is for querying the knowledge. Essentially, it inquires about the meaning of a concept under specified circumstances. We provide algorithms for evaluating sound and finite knowledge answers to describe queries, and we demonstrate them with examples.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Query languages}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Representations (procedural and rule-based)}", } @InProceedings{Royer:1990:BCE, author = "V{\'e}ronique Royer", title = "Backward chaining evaluation in stratified disjunctive theories", crossref = "ACM:1990:PPN", pages = "183--195", year = "1990", bibdate = "Wed Oct 25 08:47:37 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p183-royer/p183-royer.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p183-royer/", acknowledgement = ack-nhfb, classification = "C1230 (Artificial intelligence); C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory); C6160 (Database management systems (DBMS))", corpsource = "Dept. of Comput. Sci., ONERA, Toulouse, France", keywords = "atomic queries; backward chaining computation; database management systems; database theory; deductive databases; fixpoint; formal logic; knowledge based systems; logic programming; minimal clauses; programming theory; stratified disjunctive databases; stratified disjunctive theories", sponsororg = "SIGACT; SIGMOD; SIGART", treatment = "T Theoretical or Mathematical", } @InProceedings{Laenens:1990:ELP, author = "Els Laenens and Domenico Sacca and Dirk Vermeir", title = "Extending logic programming", crossref = "Garcia-Molina:1990:PAS", pages = "184--193", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p184-laenens/p184-laenens.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p184-laenens/", abstract = "{\em An extension of logic programming, called ``ordered logic programming'', which includes some abstractions of the object-oriented paradigm, is presented. An ordered program consists of a number of modules (objects), where each module is composed by a number of rules possibly with negated head predicates. A sort of ``isa'' hierarchy can be defined among the modules in order to allow for rule inheritance. Therefore, every module sees its own rules as local rules and the rules of the other modules to which it is connected by the ``isa'' hierarchy as global rules. In this way, as local rules may hide global rules, it is possible to deal with default properties and exceptions. This new approach represents a novel attempt to combine the logic paradigm with the object-oriented one in knowledge base systems. Moreover, this approach provides a new ground for explaining some recent proposals of semantics for classical logic programs with negation in the rule bodies and gives an interesting semantics to logic programs with negated rule heads}.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Verification", subject = "Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Software --- Software Engineering --- Design Tools and Techniques (D.2.2): {\bf Modules and interfaces}; Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Representations (procedural and rule-based)}; Software --- Programming Techniques --- General (D.1.0); Information Systems --- Database Management --- Systems (H.2.4)", } @InProceedings{Chrysanthis:1990:AFS, author = "Panayiotis K. Chrysanthis and Krithi Ramamritham", title = "{ACTA}: a framework for specifying and reasoning about transaction structure and behavior", crossref = "Garcia-Molina:1990:PAS", pages = "194--203", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p194-chrysanthis/p194-chrysanthis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p194-chrysanthis/", abstract = "Recently, a number of extensions to the traditional transaction model have been proposed to support new information-intensive applications such as CAD/CAM and software development. However, these extended models capture only a subset of interactions that can be found in such applications, and represent only some of the points within the spectrum of interactions possible in competitive and cooperative environments. \par {\em ACTA\/} is a formalizable framework developed for characterizing the whole spectrum of interactions. The ACTA framework is {\em not\/} yet another transaction model, but is intended to unify the existing models. ACTA allows for specifying the {\em structure\/} and the {\em behavior\/} of transactions as well as for reasoning about the concurrency and recovery properties of the transactions. In ACTA, the semantics of interactions are expressed in terms of transactions' effects on the commit and abort of other transactions and on objects' state and concurrency status (i.e., synchronization state). Its ability to capture the semantics of previously proposed transaction models is indicative of its generality. The reasoning capabilities of this framework have also been tested by using the framework to study the properties of a new model that is derived by combining two existing transaction models.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Software --- Operating Systems --- File Systems Management (D.4.3); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}", } @InProceedings{Schlipf:1990:EPL, author = "John S. Schlipf", title = "The expressive powers of the logic programming semantics (extended abstract)", crossref = "ACM:1990:PPN", pages = "196--204", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p196-schlipf/p196-schlipf.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p196-schlipf/", abstract = "We compare the expressive powers of three semantics for deductive databases and logic programming: the 3-valued program completion semantics, the well-founded semantics, and the stable semantics, We identify the expressive power of the stable semantics, and in fairly general circumstances that of the well-founded semantics. \par Over infinite Herbrand models, where the three semantics have equivalent expressive power, we also consider a notion of uniform translatability between the 3-valued program completion and well-founded semantics. In this sense of uniform translatability we show the well-founded semantics to be more expressive.", acknowledgement = ack-nhfb, annote = "36 papers; See also 6836.1508 1990 9th for papers", classification = "C1230 (Artificial intelligence); C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory); C6160 (Database management systems (DBMS))", corpsource = "Cincinnati Univ., OH, USA", generalterms = "Design; Languages; Management; Performance; Theory; Verification", keywords = "3-valued program completion semantics; ACM; database management systems; database systems; database theory; deductive databases; expressive powers; infinite Herbrand models; knowledge based systems; logic programming; logic programming semantics; programming theory; SIGACT; stable semantics; ternary logic; uniform translatability; well- founded semantics", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2); Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Deduction}; Information Systems --- Database Management --- Database Applications (H.2.8)", treatment = "T Theoretical or Mathematical", xxpages = "64--86", } @InProceedings{Dayal:1990:OLR, author = "Umeshwar Dayal and Meichun Hsu and Rivka Ladin", title = "Organizing long-running activities with triggers and transactions", crossref = "Garcia-Molina:1990:PAS", pages = "204--214", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p204-dayal/p204-dayal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p204-dayal/", abstract = "This paper addresses the problem of organising and controlling activities that involve multiple steps of processing and that typically are of long duration. We explore the use of triggers and transactions to specify and organize such long-running activities. Triggers offer data- or event-driven specification of control flow, and thus provide a flexible and modular framework with which the control structures of the activities can be extended or modified. We describe a model based on event-condition-action rules and coupling modes. The execution of these rules is governed by an extended nested transaction model. Through a detailed example, we illustrate the utility of the various features of the model for chaining related steps without sacrificing concurrency, for enforcing integrity constraints, and for providing flexible failure and exception handling.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Languages (H.2.3); Computer Applications --- Life and Medical Sciences (J.3): {\bf Medical information systems}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Computations on discrete structures}", } @InProceedings{Sacca:1990:SMN, author = "Domenico Sacca and Carlo Zaniolo", title = "Stable models and nondeterminism in logic programs with negation", crossref = "ACM:1990:PPN", pages = "205--217", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p205-sacca/p205-sacca.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p205-sacca/", abstract = "Previous researchers have proposed generalizations of Horn clause logic to support negation and non-determinism as two separate extensions. In this paper, we show that the stable model semantics for logic programs provides a unified basis for the treatment of both concepts. First, we introduce the concepts of partial models, stable models, strongly founded models and deterministic models and other interesting classes of partial models and study their relationships. We show that the maximal deterministic model of a program is a subset of the intersection of all its stable models and that the well-founded model of a program is a subset of its maximal deterministic model. Then, we show that the use of stable models subsumes the use of the non-deterministic {\em choice\/} construct in LDL and provides an alternative definition of the semantics of this construct. Finally, we provide a constructive definition for stable models with the introduction of a procedure, called {\em backtracking fixpoint,\/} that non-deterministically constructs a total stable model, if such a model exists.", acknowledgement = ack-nhfb, classification = "C1230 (Artificial intelligence); C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory); C6160 (Database management systems (DBMS))", corpsource = "Dipartimento di Sistemi, Calabria Univ., Rende, Italy", generalterms = "Design; Languages; Management; Performance; Reliability; Theory; Verification", keywords = "backtracking fixpoint; database management systems; database theory; deterministic models; formal logic; knowledge based systems; logic programming; logic programs; negation; nondeterminism; partial models; programming theory; stable model semantics; strongly founded models", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Theory of Computation --- Computation by Abstract Devices --- Modes of Computation (F.1.2): {\bf Alternation and nondeterminism}; Theory of Computation --- Logics and Meanings of Programs --- Semantics of Programming Languages (F.3.2)", treatment = "T Theoretical or Mathematical", } @InProceedings{Breitbart:1990:RTM, author = "Yuri Breitbart and Avi Silberschatz and Glenn R. Thompson", title = "Reliable transaction management in a multidatabase system", crossref = "Garcia-Molina:1990:PAS", pages = "215--224", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p215-breitbart/p215-breitbart.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p215-breitbart/", abstract = "A model of a multidatabase system is defined in which each local DBMS uses the two-phase locking protocol Locks are released by a global transaction only after the transaction commits or aborts at each local site. Failures may occur during the processing of transactions. We design a fault tolerant transaction management algorithm and recovery procedures that retain global database consistency. We also show that our algorithms ensure freedom from global deadlocks of any kind.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Operating Systems --- Process Management (D.4.1): {\bf Scheduling}", } @InProceedings{Abiteboul:1990:NDL, author = "Serge Abiteboul and Eric Simon and Victor Vianu", title = "Non-deterministic languages to express deterministic transformations", crossref = "ACM:1990:PPN", pages = "218--229", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p218-abiteboul/p218-abiteboul.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p218-abiteboul/", abstract = "The use of non-deterministic database languages is motivated using pragmatic and theoretical considerations. It is shown that non-determinism resolves some difficulties concerning the expressive power of deterministic languages: there are non-deterministic languages expressing low complexity classes of queries/updates, whereas no such deterministic languages exist. Various mechanisms yielding non-determinism are reviewed. The focus is on two closely related families of non-deterministic languages. The first consists of extensions of {\em Datalog\/} with negations in bodies and/or heads of rules, with non-deterministic fixpoint semantics. The second consists of non-deterministic extensions of first-order logic and fixpoint logics, using the {\em witness\/} operator. The ability of the various non-deterministic languages to express {\em deterministic\/} transformation is characterized. In particular, non-deterministic languages expressing exactly the queries/updates computable in polynomial time are exhibited, whereas it is conjectured that no analogous deterministic language exists. The connection between non-deterministic languages and determinism is also explored. Several problems of practical interest are examined, such as checking (statically or dynamically) if a given program is deterministic, detecting coincidence of deterministic and non-deterministic semantics, and verifying termination for non-deterministic programs.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Management; Performance; Theory; Verification", subject = "Information Systems --- Database Management --- Languages (H.2.3); Theory of Computation --- Computation by Abstract Devices --- Modes of Computation (F.1.2): {\bf Alternation and nondeterminism}", } @InProceedings{Abiteboul:1990:NLE, author = "S. Abiteboul and E. Simon and V. Vianu", title = "Nondeterministic languages to express deterministic transformations", crossref = "ACM:1990:PPN", pages = "218--229", year = "1990", bibdate = "Mon Mar 16 10:08:58 MST 1998", bibsource = "http://www.math.utah.edu/pub/tex/bib/pods.bib", acknowledgement = ack-nhfb, classification = "C4210 (Formal logic); C4240 (Programming and algorithm theory); C4250 (Database theory); C6140D (High level languages); C6160 (Database management systems (DBMS))", corpsource = "INRIA, Le Chesnay, France", keywords = "database management systems; database theory; Datalog; deterministic languages; deterministic transformations; expressive power; first-order logic; fixpoint logics; formal logic; logic programming; negations; nondeterministic database languages; nondeterministic fixpoint semantics; polynomial time; programming theory; query languages; witness operator", sponsororg = "SIGACT; SIGMOD; SIGART", treatment = "T Theoretical or Mathematical", } @InProceedings{Cacace:1990:IOO, author = "F. Cacace and S. Ceri and S. Crespi-Reghizzi and L. Tanca and R. Zicari", title = "Integrating object-oriented data modelling with a rule-based programming paradigm", crossref = "Garcia-Molina:1990:PAS", pages = "225--236", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p225-cacace/p225-cacace.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p225-cacace/", abstract = "LOGRES is a new project for the development of extended database systems which is based on the integration of the object-oriented data modelling paradigm and of the rule-based approach for the specification of queries and updates. \par The data model supports generalization hierarchies and object sharing, the rule-based language extends {\em Datalog\/} to support generalized type constructors (sets, multisets, and sequences), rule-based integrity constraints are automatically produced by analyzing schema definitions. Modularization is a fundamental feature, as modules encapsulate queries and updates, when modules are applied to a LOGRES database, their side effects can be controlled. \par The LOGRES project is a follow-up of the ALGRES project, and takes advantage of the ALGRES programming environment for the development of a fast prototype.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}", } @InProceedings{Yannakakis:1990:GTM, author = "Mihalis Yannakakis", title = "Graph-theoretic methods in database theory", crossref = "ACM:1990:PPN", pages = "230--242", year = "1990", bibdate = "Wed Oct 25 08:47:37 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p230-yannakakis/p230-yannakakis.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p230-yannakakis/", acknowledgement = ack-nhfb, classification = "C1160 (Combinatorial mathematics); C4250 (Database theory)", corpsource = "AT and T Bell Labs., Murray Hill, NJ, USA", keywords = "database theory; dynamic problem; graph theory; main memory model; online queries; online updates; parallel algorithms; path problems; query processing; recursive queries; searching graphs; semiring computations; transitive closure", sponsororg = "SIGACT; SIGMOD; SIGART", treatment = "B Bibliography; T Theoretical or Mathematical", } @InProceedings{Kiernan:1990:MDD, author = "G. Kiernan and C. de Maindreville and E. Simon", title = "Making deductive databases a practical technology: a step forward", crossref = "Garcia-Molina:1990:PAS", pages = "237--246", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p237-kiernan/p237-kiernan.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p237-kiernan/", abstract = "Deductive databases provide a formal framework to study rule-based query languages that are extensions of first-order logic. However, deductive database languages and their current implementations do not seem appropriate for improving the development of real applications or even sample of them. Our goal is to make deductive database technology practical. The design and implementation of the RDL1 system, presented in this paper, constitute a step toward this goal. Our approach is based on the integration of a production rule language within a relational database system, the development of a rule-based programming environment and the support of system extensibility using Abstract Data Types. We discuss important practical experience gained during the implementation of the system. Also, comparisons with related work such as LDL, STARBURST and POSTGRES are given.", acknowledgement = ack-nhfb, generalterms = "Design; Languages; Performance; Theory", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1); Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Software --- Programming Languages --- Language Constructs and Features (D.3.3): {\bf Abstract data types}; Information Systems --- Database Management --- Systems (H.2.4); Software --- Programming Languages --- Language Classifications (D.3.2): {\bf LISP}", } @InProceedings{Willard:1990:QAP, author = "Dan E. Willard", title = "Quasilinear algorithms for processing relational calculus expressions (preliminary report)", crossref = "ACM:1990:PPN", pages = "243--257", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p243-willard/p243-willard.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p243-willard/", abstract = "Throughout this paper q will denote a query such that I is the number of tuples inputted into the query, and U is the number of tuples in its output. We will say that q has quasi-linear complexity iff for some constant d, it is executable in time O(U + I log d I) and space O(I + U). This article will define a large subset of the relational calculus, called RCS, and show that all RCS queries are executable by quasi-linear algorithms. \par Our algorithm does not require the maintenance of any complex index, as it builds all the needed data structures during the course of the executing algorithm. Its exponent d can be large for some particular queries q, but it is a quite nice constant equal to 1 or 0 in most practical cases. Our algorithm is intended for data bases stored in main memory, and its time O(U + I log d I) should amount to only a few seconds of CPU time in many practical applications. \par Chapter 10 of this paper lists some open questions for further investigation.", acknowledgement = ack-nhfb, classification = "C4250 (Database theory); C6160D (Relational DBMS)", corpsource = "Dept. of Comput. Sci., State Univ. of New York, Albany, NY, USA", generalterms = "Algorithms; Design; Management; Performance; Theory; Verification", keywords = "computational complexity; data structures; database theory; main memory; quasi-linear complexity; query languages; RCS; RCS queries; relational calculus expressions; relational databases", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Computing Methodologies --- Symbolic and Algebraic Manipulation --- Algorithms (I.1.2); Computing Methodologies --- Symbolic and Algebraic Manipulation --- Expressions and Their Representation (I.1.1); Information Systems --- Database Management --- Systems (H.2.4): {\bf Relational databases}", treatment = "T Theoretical or Mathematical", } @InProceedings{Mumick:1990:MR, author = "I. S. Mumick and S. J. Finkelstein and Hamid Pirahesh and Raghu Ramakrishnan", title = "Magic is relevant", crossref = "Garcia-Molina:1990:PAS", pages = "247--258", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p247-mumick/p247-mumick.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p247-mumick/", abstract = "We define the magic-sets transformation for traditional relational systems (with duplicates, aggregation and grouping), as well as for relational systems extended with recursion. We compare the magic-sets rewriting to traditional optimization techniques for nonrecursive queries, and use performance experiments to argue that the magic-sets transformation is often a better optimization technique.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Experimentation; Languages; Performance", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}", } @InProceedings{Abdel-Ghaffar:1990:ODA, author = "Khaled A. S. Abdel-Ghaffar and Amr {El Abbadi}", title = "On the optimality of disk allocation for {Cartesian} product files (extended abstract)", crossref = "ACM:1990:PPN", pages = "258--264", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p258-abdel-ghaffar/p258-abdel-ghaffar.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p258-abdel-ghaffar/", abstract = "In this paper we present a coding-theoretic analysis of the disk allocation problem. We provide both necessary and sufficient conditions for the existence of strictly optimal allocation methods. Based on a class of optimal codes, known as maximum distance separable codes, strictly optimal allocation methods are constructed. Using the necessary conditions proved, we argue that the standard definition of strict optimality is too strong, and cannot be attained in general. A new criterion for optimality is therefore defined whose objective is to design allocation methods that yield a response time of one for all queries with a minimum number of specified attributes. Using coding theory, we determined this minimum number for binary files, assuming that the number of disks is a power of two. In general, our approach provides better allocation methods than previous techniques.", acknowledgement = ack-nhfb, classification = "C1260 (Information theory); C4250 (Database theory); C6120 (File organisation)", corpsource = "Dept of Electr. Eng. and Comput. Sci., California Univ., Davis, CA, USA", generalterms = "Design; Management; Measurement; Performance; Theory; Verification", keywords = "binary files; Cartesian product files; coding-theoretic analysis; database theory; disk allocation; information theory; maximum distance separable codes; necessary conditions; optimal allocation methods; response time; storage allocation", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Data --- Coding and Information Theory (E.4); Software --- Operating Systems --- Storage Management (D.4.2): {\bf Allocation/deallocation strategies}; Information Systems --- Information Storage and Retrieval --- Information Storage (H.3.2): {\bf File organization}", treatment = "T Theoretical or Mathematical", } @InProceedings{Widom:1990:SOP, author = "Jennifer Widom and S. J. Finkelstein", title = "Set-oriented production rules in relational database systems", crossref = "Garcia-Molina:1990:PAS", pages = "259--270", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p259-widom/p259-widom.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p259-widom/", abstract = "We propose incorporating a production rules facility into a relational database system. Such a facility allows definition of database operations that are automatically executed whenever certain conditions are met. In keeping with the set-oriented approach of relational data manipulation languages, our production rules are also set-oriented--they are triggered by sets of changes to the database and may perform sets of changes. The condition and action parts of our production rules may refer to the current state of the database as well as to the sets of changes triggering the rules. We define a syntax for production rule definition as an extension to SQL. A model of system behavior is used to give an exact semantics for production rule execution, taking into account externally-generated operations, self-triggering rules, and simultaneous triggering of multiple rules.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Representations (procedural and rule-based)}; Information Systems --- Database Management --- Languages (H.2.3): {\bf SQL}; Information Systems --- Database Management --- Systems (H.2.4)", } @InProceedings{Aref:1990:EPW, author = "Walid G. Aref and Hanan Samet", title = "Efficient processing of window queries in the pyramid data structure", crossref = "ACM:1990:PPN", pages = "265--272", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p265-aref/p265-aref.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p265-aref/", abstract = "Window operations serve as the basis of a number of queries that can be posed in a spatial database. Examples of these window-based queries include the exist query (i.e., determining whether or not a spatial feature exists inside a window) and the report query, (i.e., reporting the identity of all the features that exist inside a window). Algorithms are described for answering window queries in ($n$ log log {$T$}) time for a window of size $n$ x $n$ in a feature space (e.g., an image) of size {$T$} x {$T$} (e.g., pixel elements). The significance of this result is that even though the window contains $n$ 2 pixel elements, the worst-case time complexity of the algorithms is almost linearly proportional (and not quadratic) to the window diameter, and does not depend on other factors. The above complexity bounds are achieved via the introduction of the incomplete pyramid data structure (a variant of the pyramid data structure) as the underlying representation to store spatial features and to answer queries on them.", acknowledgement = ack-nhfb, classification = "C4240 (Programming and algorithm theory); C4250 (Database theory); C6160Z (Other DBMS)", corpsource = "Inst. for Adv. Comput. Studies, Maryland Univ., College Park, MD, USA", generalterms = "Algorithms; Design; Management; Measurement; Performance; Theory", keywords = "computational complexity; data structures; database management systems; database theory; exist query; pixel elements; pyramid data structure; report query; spatial database; window queries; worst-case time complexity", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Data --- Data Structures (E.1)", treatment = "T Theoretical or Mathematical", } @InProceedings{Hanson:1990:PMA, author = "Eric N. Hanson and Moez Chaabouni and Chang-Ho Kim and Yu-Wang Wang", title = "A predicate matching algorithm for database rule systems", crossref = "Garcia-Molina:1990:PAS", pages = "271--280", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p271-hanson/p271-hanson.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p271-hanson/", abstract = "Forward-chaining rule systems must test each newly asserted fact against a collection of predicates to find those rules that match the fact. Expert system rule engines use a simple combination of hashing and sequential search for this matching. We introduce an algorithm for finding the matching predicates that is more efficient than the standard algorithm when the number of predicates is large. We focus on equality and inequality predicates on totally ordered domains. This algorithm is well-suited for database rule systems, where predicate-testing speed is critical. A key component of the algorithm is the {\em interval binary search tree\/} (IBS-tree). The IBS-tree is designed to allow efficient retrieval of all intervals (e.g., range predicates) that overlap a point, while allowing dynamic insertion and deletion of intervals. The algorithm could also be used to improve the performance of forward-chaining inference engines for large expert systems applications.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance", subject = "Computing Methodologies --- Artificial Intelligence --- Knowledge Representation Formalisms and Methods (I.2.4): {\bf Representations (procedural and rule-based)}; Computing Methodologies --- Artificial Intelligence --- Problem Solving, Control Methods, and Search (I.2.8): {\bf Heuristic methods}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Sorting and searching}; Computing Methodologies --- Artificial Intelligence --- Problem Solving, Control Methods, and Search (I.2.8): {\bf Graph and tree search strategies}; Information Systems --- Database Management --- Systems (H.2.4)", } @InProceedings{Johnson:1990:FPA, author = "Theodore Johnson and Dennis Shasha", title = "A framework for the performance analysis of concurrent {B}-tree algorithms", crossref = "ACM:1990:PPN", pages = "273--287", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p273-johnson/p273-johnson.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p273-johnson/", abstract = "Many concurrent B-tree algorithms have been proposed, but they have not yet been satisfactorily analyzed. When transaction processing systems require high levels of concurrency, a restrictive serialization technique on the B-tree index can cause a bottleneck. In this paper, we present a framework for constructing analytical performance models of concurrent B-tree algorithms. The models can predict the response time and maximum throughput. We analyze three algorithms: Naive Lock-coupling, Optimistic Descent, and the Lehman-Yao algorithm. The analyses are validated by simulations of the algorithms on actual B-trees. Simple and instructive rules of thumb for predicting performance are also derived. We apply the analyses to determine the effect of database recovery on B-tree concurrency.", acknowledgement = ack-nhfb, classification = "C4250 (Database theory); C6160B (Distributed DBMS)", corpsource = "Courant Inst. of Math. Sci., New York Univ., NY, USA", generalterms = "Algorithms; Design; Experimentation; Management; Measurement; Performance; Theory", keywords = "B-tree index; concurrency control; concurrent B-tree algorithms; data structures; database recovery; database theory; distributed databases; Lehman-Yao algorithm; maximum throughput; naive lock-coupling; optimistic descent; performance analysis; response time; transaction processing systems; trees (mathematics)", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Concurrency}; Mathematics of Computing --- Discrete Mathematics --- General (G.2.0); Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Mathematics of Computing --- Probability and Statistics (G.3): {\bf Queueing theory}", treatment = "T Theoretical or Mathematical", } @InProceedings{Stonebraker:1990:RPC, author = "Michael Stonebraker and Anant Jhingran and Jeffrey Goh and Spyros Potamianos", title = "On rules, procedure, caching and views in data base systems", crossref = "Garcia-Molina:1990:PAS", pages = "281--290", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p281-stonebraker/p281-stonebraker.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p281-stonebraker/", abstract = "This paper demonstrates that a simple rule system can be constructed that supports a more powerful view system than available in current commercial systems. Not only can views be specified by using rules but also special semantics for resolving ambiguous view updates are simply additional rules. Moreover, procedural data types as proposed in POSTGRES are also efficiently simulated by the same rules system. Lastly, caching of the action part of certain rules is a possible performance enhancement and can be applied to materialize views as well as to cache procedural data items. Hence, we conclude that a rule system is a fundamental concept in a next generation DBMS, and it subsumes both views and procedures as special cases.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Languages (H.2.3)", } @InProceedings{Lassez:1990:QC, author = "Jean-Louis Lassez", title = "Querying constraints", crossref = "ACM:1990:PPN", pages = "288--298", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p288-lassez/p288-lassez.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p288-lassez/", abstract = "The design of languages to tackle constraint satisfaction problems has a long history. Only more recently the reverse problem of introducing constraints as primitive constructs in programming languages has been addressed. A main task that the designers and implementors of such languages face is to use and adapt the concepts and algorithms from the extensive studies on constraints done in areas such as Mathematical Programming, Symbolic Computation, Artificial Intelligence, Program Verification and Computational Geometry. In this paper, we illustrate this task in a simple and yet important domain: linear arithmetic constraints. We show how one can design a querying system for sets of linear constraints by using basic concepts from logic programming and symbolic computation, as well as algorithms from linear programming and computational geometry. We conclude by reporting briefly on how notions of negation and canonical representation used in linear constraints can be generalized to account for cases in term algebras, symbolic computation, affine geometry, and elsewhere.", acknowledgement = ack-nhfb, classification = "C6140D (High level languages); C6160 (Database management systems (DBMS))", corpsource = "IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA", generalterms = "Algorithms; Design; Languages; Management; Performance; Theory", keywords = "affine geometry; canonical representation; computational geometry; constraint satisfaction problems; database management systems; linear arithmetic constraints; linear programming; logic programming; negation; primitive constructs; programming languages; query languages; querying system; reverse problem; symbolic computation; term algebras", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Information Systems --- Database Management --- Languages (H.2.3); Mathematics of Computing --- Numerical Analysis --- Optimization (G.1.6): {\bf Linear programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}", treatment = "P Practical", } @InProceedings{Rosenthal:1990:QGI, author = "Arnon Rosenthal and Cesar Galindo-Legaria", title = "Query graphs, implementing trees, and freely-reorderable outerjoins", crossref = "Garcia-Molina:1990:PAS", pages = "291--299", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p291-rosenthal/p291-rosenthal.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p291-rosenthal/", abstract = "We determine when a join/outerjoin query can be expressed unambiguously as a query graph, without an explicit specification of the order of evaluation. To do so, we first characterize the set of expression trees that implement a given join/outerjoin query graph, and investigate the existence of transformations among the various trees. Our main theorem is that a join/outerjoin query is freely reorderable if the query graph derived from it falls within a particular class, every tree that ``implements'' such a graph evaluates to the same result. \par The result has applications to language design and query optimization. Languages that generate queries within such a class do not require the user to indicate priority among join operations, and hence may present a simplified syntax. And it is unnecessary to add extensive analyses to a conventional query optimizer in order to generate legal reorderings for a freely-reorderable language.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Performance; Theory", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Mathematics of Computing --- Discrete Mathematics --- Graph Theory (G.2.2): {\bf Trees}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Computations on discrete structures}", } @InProceedings{Kanellakis:1990:CQL, author = "Paris C. Kanellakis and Gabriel M. Kuper and Peter Z. Revesz", title = "Constraint query languages (preliminary report)", crossref = "ACM:1990:PPN", pages = "299--313", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p299-kanellakis/p299-kanellakis.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p299-kanellakis/", abstract = "We discuss the relationship between constraint programming and database query languages. We show that bottom-up, efficient, declarative database programming can be combined with efficient constraint solving. The key intuition is that the generalization of a ground fact, or tuple, is a conjunction of constraints. We describe the basic Constraint Query Language design principles, and illustrate them with four different classes of constraints: Polynomial, rational order, equality, and Boolean constraints.", acknowledgement = ack-nhfb, annote = "36 papers; See also 6836.1508 1990 9th for papers", classification = "C6140D (High level languages); C6160 (Database management systems (DBMS))", corpsource = "Brown Univ., Providence, RI, USA", generalterms = "Design; Languages; Management; Performance; Theory", keywords = "ACM; constraint programming; constraint solving; database management systems; database query languages; database systems; declarative database programming; logic programming; query languages; SIGACT", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Mathematics of Computing --- Numerical Analysis --- Optimization (G.1.6): {\bf Constrained optimization}; Information Systems --- Database Management --- Languages (H.2.3); Computing Methodologies --- Computer Graphics --- Computational Geometry and Object Modeling (I.3.5)", treatment = "P Practical", xxpages = "26--52", } @InProceedings{Shekita:1990:PEP, author = "Eugene J. Shekita and Michael J. Carey", title = "A performance evaluation of pointer-based joins", crossref = "Garcia-Molina:1990:PAS", pages = "300--311", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p300-shekita/p300-shekita.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p300-shekita/", abstract = "In this paper we describe three pointer-based join algorithms that are simple variants of the nested-loops, sort-merge, and hybrid-hash join algorithms used in relational database systems. Each join algorithm is described and an analysis is carried out to compare the performance of the pointer-based algorithms to their standard, non-pointer-based counterparts. The results of the analysis show that the pointer-based algorithms can provide significant performance gains in many situations. The results also show that the pointer-based nested-loops join algorithm, which is perhaps the most natural pointer-based join algorithm to consider using in an object-oriented database system, performs quite poorly on most medium to large joins.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance", subject = "Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Sorting and searching}", } @InProceedings{Ioannidis:1990:RAO, author = "Y. E. Ioannidis and Younkyung Kang", title = "Randomized algorithms for optimizing large join queries", crossref = "Garcia-Molina:1990:PAS", pages = "312--321", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p312-ioannidis/p312-ioannidis.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p312-ioannidis/", abstract = "Query optimization for relational database systems is a combinatorial optimization problem, which makes exhaustive search unacceptable as the query size grows. Randomized algorithms, such as Simulated Annealing (SA) and Iterative Improvement (II), are viable alternatives to exhaustive search. We have adapted these algorithms to the optimization of project-select-join queries. We have tested them on large queries of various types with different databases, concluding that in most cases SA identifies a lower cost access plan than II. To explain this result, we have studied the shape of the cost function over the solution space associated with such queries and we have conjectured that it resembles a `cup' with relatively small variations at the bottom. This has inspired a new Two Phase Optimization algorithm, which is a combination of Simulated Annealing and Iterative Improvement. Experimental results show that Two Phase Optimization outperforms the original algorithms in terms of both output quality and running time.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Experimentation; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Miscellaneous (F.2.m); Mathematics of Computing --- Numerical Analysis --- Optimization (G.1.6)", } @InProceedings{Mumick:1990:MC, author = "Inderpal Singh Mumick and Sheldon J. Finkelstein and Hamid Pirahesh and Raghu Ramakrishnan", title = "Magic conditions", crossref = "ACM:1990:PPN", pages = "314--330", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p314-mumick/p314-mumick.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p314-mumick/", abstract = "Much recent work has focussed on the bottom-up evaluation of Datalog programs. One approach, called Magic-Sets, is based on rewriting a logic program so that bottom-up fixpoint evaluation of the program avoids generation of irrelevant facts ([BMSU86, BR87, Ram88]). It is widely believed that the principal application of the Magic-Sets technique is to restrict computation in recursive queries using equijoin predicates. We extend the Magic-Set transformation to use predicates other than equality ({$X$} 10, for example). This Extended Magic-Set technique has practical utility in ``real'' relational databases, not only for recursive queries, but for non-recursive queries as well; in ([MFPR90]) we use the results in this paper and those in [MPR89] to define a magic-set transformation for relational databases supporting SQL and its extensions, going on to describe an implementation of magic in Starburst ([HFLP89]). We also give preliminary performance measurements. \par In extending Magic-Sets, we describe a natural generalization of the common class of bound $b$ and free () adornments. We also present a formalism to compare adornment classes.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Design; Languages; Management; Performance; Reliability; Theory; Verification", subject = "Information Systems --- Database Management --- Languages (H.2.3): {\bf Datalog}; Theory of Computation --- Mathematical Logic and Formal Languages --- Mathematical Logic (F.4.1): {\bf Logic and constraint programming}; Computing Methodologies --- Artificial Intelligence --- Deduction and Theorem Proving (I.2.3): {\bf Logic programming}; Theory of Computation --- Mathematical Logic and Formal Languages --- Grammars and Other Rewriting Systems (F.4.2): {\bf Parallel rewriting systems}", } @InProceedings{Mumick:1990:MCR, author = "I. S. Mumick and S. J. Finkelstein and H. Pirahesh and Ramakrishnan and R.", title = "Magic conditions (relational queries)", crossref = "ACM:1990:PPN", pages = "314--380", year = "1990", bibdate = "Mon Mar 16 10:08:58 MST 1998", bibsource = "http://www.math.utah.edu/pub/tex/bib/pods.bib", acknowledgement = ack-nhfb, classification = "C4250 (Database theory); C6140D (High level languages); C6160D (Relational DBMS)", corpsource = "Stanford Univ., CA, USA", keywords = "adornment classes; bottom-up evaluation; database theory; Datalog programs; equijoin predicates; logic program; Magic-Sets; query languages; recursive queries; relational databases", sponsororg = "SIGACT; SIGMOD; SIGART", treatment = "P Practical", } @InProceedings{Beckmann:1990:RTE, author = "Norbert Beckmann and Hans-Peter Kriegel and Ralf Schneider and Bernhard Seeger", title = "The {R$^*$-tree}: an efficient and robust access method for points and rectangles", crossref = "Garcia-Molina:1990:PAS", pages = "322--331", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p322-beckmann/p322-beckmann.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p322-beckmann/", abstract = "The R-tree, one of the most popular access methods for rectangles, is based on the heuristic optimization of the area of the enclosing rectangle in each inner node. By running numerous experiments in a standardized testbed under highly varying data, queries and operations, we were able to design the R * -tree which incorporates a combined optimization of area, margin and overlap of each enclosing rectangle in the directory. Using our standardized testbed in an exhaustive performance comparison, it turned out that the R * -tree clearly outperforms the existing R-tree variants. Guttman's linear and quadratic R-tree and Greene's variant of the R-tree. This superiority of the R * -tree holds for different types of queries and operations, such as map overlay, for both rectangles and multidimensional points in all experiments. From a practical point of view the R * -tree is very attractive because of the following two reasons 1 it efficiently supports point and spatial data at the same time and 2 its implementation cost is only slightly higher than that of other R-trees.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Performance", subject = "Data --- Data Structures (E.1): {\bf Trees}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Sorting and searching}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Haritsa:1990:BOA, author = "Jayant R. Haritsa and Michael J. Carey and Miron Livny", title = "On being optimistic about real-time constraints", crossref = "ACM:1990:PPN", pages = "331--343", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p331-haritsa/p331-haritsa.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p331-haritsa/", abstract = "Performance studies of concurrency control algorithms for conventional database systems have shown that, under most operating circumstances, locking protocols outperform optimistic techniques. Real-time database systems have special characteristics - timing constraints are associated with transactions, performance criteria are based on satisfaction of these timing constraints, and scheduling algorithms are priority driven. In light of these special characteristics, results regarding the performance of concurrency control algorithms need to be re-evaluated. We show in this paper that the following parameters of the real-time database system - its policy for dealing with transactions whose constraints are not met, its knowledge of transaction resource requirements, and the availability of resources - have a significant impact on the relative performance of the concurrency control algorithms. In particular, we demonstrate that under a policy that discards transactions whose constraints are not met, optimistic concurrency control outperforms locking over a wide range of system utilization. We also outline why, for a variety of reasons, optimistic algorithms appear well-suited to real-time database systems.", acknowledgement = ack-nhfb, classification = "C6160B (Distributed DBMS)", corpsource = "Dept. of Comput. Sci., Wisconsin Univ., Madison, WI, USA", generalterms = "Algorithms; Design; Experimentation; Management; Measurement; Performance; Theory", keywords = "concurrency control; conventional database systems; distributed databases; locking; locking protocols; optimistic techniques; performance criteria; real-time constraints; real-time database system; real-time systems; scheduling algorithms; timing constraints; transaction processing", sponsororg = "SIGACT; SIGMOD; SIGART", subject = "Computer Systems Organization --- Special-Purpose and Application-Based Systems (C.3): {\bf Real-time and embedded systems}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Transaction processing}; Information Systems --- Database Management --- Physical Design (H.2.2)", treatment = "P Practical", } @InProceedings{Jagadish:1990:LCO, author = "H. V. Jagadish", title = "Linear clustering of objects with multiple attributes", crossref = "Garcia-Molina:1990:PAS", pages = "332--342", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p332-jagadish/p332-jagadish.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p332-jagadish/", abstract = "There is often a need to map a multi-dimensional space on to a one-dimensional space. For example, this kind of mapping has been proposed to permit the use of one-dimensional indexing techniques to a multi-dimensional index space such as in a spatial database. This kind of mapping is also of value in assigning physical storage, such as assigning buckets to records that have been indexed on multiple attributes, to minimize the disk access effort. \par In this paper, we discuss what the desired properties of such a mapping are, and evaluate, through analysis and simulation, several mappings that have been proposed in the past. We present a mapping based on Hilbert's space-filling curve, which out-performs previously proposed mappings on average over a variety of different operating conditions.", acknowledgement = ack-nhfb, generalterms = "Algorithms; Experimentation; Performance", subject = "Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Sorting and searching}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}; Data --- Files (E.5): {\bf Sorting/searching}; Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}", } @InProceedings{Orenstein:1990:CSQ, author = "Jack Orenstein", title = "A comparison of spatial query processing techniques for native and parameter spaces", crossref = "Garcia-Molina:1990:PAS", pages = "343--352", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/mod/93597/p343-orenstein/p343-orenstein.pdf; http://www.acm.org/pubs/citations/proceedings/mod/93597/p343-orenstein/", abstract = "Spatial queries can be evaluated in native space or in a parameter space. In the latter case, data objects are transformed into points and query objects are transformed into search regions. The requirement for different data and query representations may prevent the use of parameter-space searching in some applications. Native-space and parameter-space searching are compared in the context of a z order-based spatial access method. Experimental results show that when there is a single query object, searching in parameter space can be faster than searching in native space, if the data and query objects are large enough, and if sufficient redundancy is used for the query representation. The result is, however, less accurate than the native space result. When there are multiple query objects, native-space searching is better initially, but as the number of query objects increases, parameter space searching with low redundancy is superior. Native-space searching is much more accurate for multiple-object queries.", acknowledgement = ack-nhfb, generalterms = "Design; Experimentation; Performance", subject = "Information Systems --- Database Management --- Systems (H.2.4): {\bf Query processing}; Theory of Computation --- Analysis of Algorithms and Problem Complexity --- Nonnumerical Algorithms and Problems (F.2.2): {\bf Sorting and searching}; Data --- Files (E.5): {\bf Sorting/searching}; Information Systems --- Database Management --- Logical Design (H.2.1): {\bf Data models}", } @InProceedings{Tam:1990:TTM, author = "Va-On Tam and Meichun Hsu", title = "Token transactions: managing fine-grained migration of data", crossref = "ACM:1990:PPN", pages = "344--356", year = "1990", bibdate = "Wed Oct 25 12:40:13 MDT 2000", bibsource = "http://www.acm.org/pubs/contents/proceedings/series/sigmod_pods/; http://www.math.utah.edu/pub/tex/bib/pods.bib", URL = "http://www.acm.org/pubs/articles/proceedings/pods/298514/p344-tam/p344-tam.pdf; http://www.acm.org/pubs/citations/proceedings/pods/298514/p344-tam/", abstract = "Executing a transaction in a conventional distributed database system involves the execution of several subtransactions, each at a remote site where the data reside and running a two-phase commit protocol at the end of the transaction. With the advent of fast communication networks, we consider an alternative paradigm where the remote data being accessed are dynamically {\em migrated\/} to the initiation site of the transaction. One example of such a system is a distributed shared virtual memory system. \par In this paper, we examine the problem of recovery from system failure in data migration systems. Most data migration systems use the notion of {\em tokens\/} for the access rights a site has on the data elements it caches. Our goal is to recover the site's knowledge of the set of tokens it owned when a system failure occurred. Our approach is to consider the token knowledge at each si