EFFICIENT MAINTENANCE OF DERIVED INFORMATION

IN ACTIVE DATABASES

 

J.A. Bakker and J.H. ter Bekke

 

Abstract

Consistency of derived data can be dealt with by approaches such as materialized views or procedural rules. These solutions cannot be applied in the declarative Xplain approach, which requires a rule to be specified in terms of a derivable variable and a calculation, independent of the triggering event. If an event triggers the evaluation of a rule (assertion) specifying a set calculation, this could lead to a superfluous recalculation of data. Therefore, depending on the kind of triggering event, this paper presents a solution for the transformation of a set operation into a more efficient calculation.

 

Keywords:        Active Databases, Declarative Rules, Intelligent Databases, Rule Transformation.

 

Publication Data

Proceedings of the Sixth IASTED International Conference on Artificial Intelligence and Soft Computing (ASC 2002), Banff, Canada, pp. 118-122.

Editor: H. Leung

Publisher: ACTA Press, Anaheim, Calgary, Zürich

Year: 2002

ISBN: 0-88986-346-6