Distributed events in active database systems: Letting the genie out of the bottle

摘要

Similar to grouping autonomous DBMSs within large-scale distributed, heterogeneous and loosely coupled networks into DBMS federations, active information sources may be grouped into active DBMS federations. The paper claims that as a prerequisite for such federations, event handling must be separated from the members of the federation and concentrated within an independent network component. Two consequences of such a decision are explored in the paper. The construction of suitable wrappers that perform the task of event detection for a large variety of active and passive information sources, and the unbundling of event processing based on ECA rules into a number of individual functions which can then be distributed across the network and configured into event handlers that pursue specific strategies.