Active services for federated databases

ABSTRACT This paper presents an architecture of a component based active mechanism suitable for federated database systems, i.e., a collection of autonomous DBMS with a common understanding of their universe of discourse. The main components of the mechanism are exible event and rule services that cooperate to execute active rules. The event service speci es and generates event managers that detect, produce and notify events using an event management model. The rule service manages Event-Condition-Action rules global to federated database systems. Rules are triggered by events noti ed by event managers. They are executed according to an adaptable execution model. Conditions and actions can concern multiple DBMS.

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