An Extended Disjunctive Normal Form Approach for Optimizing Recursive Logic Queries in Loosely Coupled Environments.
Kyu-Young Whang, Shamkant B. Navathe:
An Extended Disjunctive Normal Form Approach for Optimizing Recursive Logic Queries in Loosely Coupled Environments.
VLDB 1987: 275-287@inproceedings{DBLP:conf/vldb/WhangN87,
author = {Kyu-Young Whang and
Shamkant B. Navathe},
editor = {Peter M. Stocker and
William Kent and
Peter Hammersley},
title = {An Extended Disjunctive Normal Form Approach for Optimizing Recursive
Logic Queries in Loosely Coupled Environments},
booktitle = {VLDB'87, Proceedings of 13th International Conference on Very
Large Data Bases, September 1-4, 1987, Brighton, England},
publisher = {Morgan Kaufmann},
year = {1987},
isbn = {0-934613-46-X},
pages = {275-287},
ee = {db/conf/vldb/WhangN87.html},
crossref = {DBLP:conf/vldb/87},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX
Abstract
We present an approach to processing logic queries in loosely
coupled environments.
We emphasize the importance of the loose coupling technique
as a practical solution to provide deductive capabilities
to existing DBMSs-especially when an efficient access to
a very large database is required in the
process of inferencing.
We propose the Extended Disjunctive Normal Form (EDNF) as the
basis of our approach.
The EDNF is an extension of the disjunctive normal form of
relational algebra expressions so as to include recursion.
The EDNF is well suited for a loosely coupled environment,
where an existing DBMS and optimization can be fully exploited.
It also serves as a clear, graphical characterization of
various recursions that can occur in logic queries.
We first present the basic form of the EDNF and then use it as
a building block to process a more general class of queries.
We extend valid usage of Clark`s negation-as-failure evaluation
technique to incorporate negation for most practical situations.
We also propose new criteria for safety and termination in the
presence of negation.
To the extent of the author`s knowledge, optimization in loosely
coupled environments has not been seriously addressed in previous research.
We believe our technique provides significant progress in this direction.
Copyright © 1987 by the VLDB Endowment.
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its date appear, and notice is given that copying
is by the permission of the Very Large Data Base
Endowment. To copy otherwise, or to republish, requires
a fee and/or special permission from the Endowment.
Online Paper
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BibTeX
Printed Edition
Peter M. Stocker, William Kent, Peter Hammersley (Eds.):
VLDB'87, Proceedings of 13th International Conference on Very Large Data Bases, September 1-4, 1987, Brighton, England.
Morgan Kaufmann 1987, ISBN 0-934613-46-X
Contents BibTeX
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Referenced by
- Philippe De Smedt, Stefano Ceri, Marie-Anne Neimat, Ming-Chien Shan, Rafi Ahmed:
Recursive Functions in Iris.
ICDE 1993: 145-154
- Kyu-Young Whang, Ravi Krishnamurthy:
Query Optimization in a Memory-Resident Domain Relational Calculus Database System.
ACM Trans. Database Syst. 15(1): 67-95(1990)
- Howard W. Beck, Sunit K. Gala, Shamkant B. Navathe:
Classification as a Query Processing Technique in the CANDIDE Semantic Data Model.
ICDE 1989: 572-581
- Kyu-Young Whang, Stephen Brady:
A Framework for Optimization in Expert System - DBMS Interface.
ICDE 1988: 126-133
BibTeX
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