Safety of Datalog Queries over Infinite Databases.
Yehoshua Sagiv, Moshe Y. Vardi:
Safety of Datalog Queries over Infinite Databases.
PODS 1989: 160-171@inproceedings{DBLP:conf/pods/SagivV89,
author = {Yehoshua Sagiv and
Moshe Y. Vardi},
title = {Safety of Datalog Queries over Infinite Databases},
booktitle = {Proceedings of the Eighth ACM SIGACT-SIGMOD-SIGART Symposium
on Principles of Database Systems, March 29-31, 1989, Philadelphia,
Pennsylvania},
publisher = {ACM Press},
year = {1989},
isbn = {0-89791-308-6},
pages = {160-171},
ee = {http://doi.acm.org/10.1145/73721.73738, db/conf/pods/SagivV89.html},
crossref = {DBLP:conf/pods/89},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
BibTeX
Abstract
A query is 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 finiteness constraints. We show that safety can be viewed as
a combination of two properties: weak safety,
which guarantees the finiteness of intermediate
answers, and termination, which guarantees the
finiteness of the evaluation. We prove that while
weak safety is decidable, termination is not. We
then consider 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 functional dependencies,
is undecidable even for monadic programs.
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BibTeX
Printed Edition
Proceedings of the Eighth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, March 29-31, 1989, Philadelphia, Pennsylvania.
ACM Press 1989, ISBN 0-89791-308-6
Contents BibTeX
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Referenced by
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Static Analysis Techniques for Predicting the Behavior of Active Database Rules.
ACM Trans. Database Syst. 20(1): 3-41(1995)
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Foundations of Databases.
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Contents - Jiawei Han:
Constraint-Based Query Evaluation in Deductive Databases.
IEEE Trans. Knowl. Data Eng. 6(1): 96-107(1994)
- Surajit Chaudhuri, Moshe Y. Vardi:
On the Complexity of Equivalence between Recursive and Nonrecursive Datalog Programs.
PODS 1994: 107-116
- Jiawei Han:
Compilation-Based List Processing in Deductive Databases.
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- Ulrich Güntzer, Werner Kießling, Helmut Thöne:
New Directions For Uncertainty Reasoning In Deductive Databases.
SIGMOD Conference 1991: 178-187
- Alexander Brodsky, Yehoshua Sagiv:
Inference of Inequality Constraints in Logic Programs.
PODS 1991: 227-240
- Jiawei Han:
Constraint-Based Reasoning in Deductive Databases.
ICDE 1991: 257-265
- Moshe Y. Vardi:
Automata Theory for Database Theoreticans.
PODS 1989: 83-92
BibTeX
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