The monitoring of complex active rules with vector representation
Dongwook Kim, Myoung Ho Kim, Yoon Joon Lee · 1997
Rule monitoring is important for high perfozmance of active database systems.Most previous works used the incremental evaluation techniques, but their operations are relatively expensive because the exact evaluation of the condition is performed at every event occurrence.In this paper, we present the vector representation of database state, databMe operations, and complex condition expressions.Then, we propose an optimization method based on the properties of a vector space.Our proposed method determines the truth value of the rule conditions only with the delta vectors maintained in main memory.We compare our method with a typical incremental evaluation method and show that the proposed method can give a significant performance enhancement.