Better Static Rule Analysis for Active Database Systems

Abstract

Rules in active database systems can be very diffcult to program, due to the unstructured and unpredictable nature of rule processing. We provide static analysis techniques for predicting whether a given rule set is guaranteed to terminate, and whether rule execution is confluent (guaranteed to have a unique final Our methods are based on previous techniques for analyzing rules in active database systems. We improve considerably on the previous techniques by providing analysis criteria that are much less conservative: our methods often determine that a rule set will terminate or is confluent when previous methods could not make this determination. Our improved analysis is based on a "propagation" algorithm, which uses an extended relational algebra to accurately determine when the action of one rule can affect the condition of another, and to determine when rule actions commute. We consider both Condition-Action rules and Event-Condition-Action rules, making our approach widely applicable to relational active database rule languages.