Query processing in deductive databases with incomplete information

Author:

Imielinski Tomasz1

Affiliation:

1. Department of Computer Science, Rutgers University, New Brunswick, New Jersey

Abstract

We study here automated deduction in databases in the presence of various types of inference rules of the form of Horn Clauses with Skolem functions. These inference rules are typical for databases with incomplete information. We demonstrate a number of results related to processing of conjunctive queries for different types of database intensions. In particular, we show that when a database intension is built from possibly cyclic inclusion dependencies and view definitions any conjunctive query can be translated to the an equivalent form which can be evaluated directly over the database extension (disregarding inference rules). We also demonstrate that the complexity of query processing significantly grows when we mix incomplete information with recursive rules. In particular, we demonstrate here that even the power of least fixpoint extension of first order logic may be not sufficient to process queries in the presence of incomplete data and recursive rules. The same is demonstrated in case disjunctive information is allowed in the database.

Publisher

Association for Computing Machinery (ACM)

Subject

Information Systems,Software

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Imperfect Information in Relational Databases;Uncertainty Management in Information Systems;1997

2. A Bibliography on Uncertainty Management in Information Systems;Uncertainty Management in Information Systems;1997

3. On deductive databases with incomplete information;ACM Transactions on Information Systems;1995-07

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