Meta-Level Control for Deductive Database Systems

Meta-Level Control for Deductive Database Systems

by Helmut Schmidt


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The development of database technology has currently reached the stage of deductive database systems which use Horn clauses for defining relations. An important characteristic of these systems is the clear separation of logic and control. However, the programmer cannot affect the control part of a deductive database system. To eliminate this deficiency, this monograph presents a so-called expert deductive database system that allows explicit control of the deduction process. The system consists of an object-level describing the logical aspects of a problem and of a meta-level that contains application-specific control information affecting the object-level deduction process. For example, object-level rules can be disregarded, and some tuples deduced at the object-level can be preferred to others. Besides the architecture of this system, the book also identifies some important possibilities of deduction control which are explained by characteristic examples.

Product Details

ISBN-13: 9783540537540
Publisher: Springer Berlin Heidelberg
Publication date: 04/08/1991
Series: Lecture Notes in Computer Science , #479
Edition description: 1991
Pages: 156
Product dimensions: 6.10(w) x 9.17(h) x 0.01(d)

Table of Contents

A standard deductive database system.- An expert deductive database system.- Discarding irrelevant tuples.- Disregarding irrelevant rules.- Explicit termination of recursion.- Preferring useful rules.- Preferring useful tuples.- Summary and outlook.

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