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Making a database system active entails not only the specification of expressive ECA (event-condition-action) rules, algorithms for the detection of composite events, and rule management, but also a viable architecture for rule execution that extends a passive DBMS, and its implementation. We propose an integrated active DBMS architecture for incorporating ECA rules using the Open OODB Toolkit (from Texas Instruments). We then describe the implementation of the composite event detector, and rule execution model for object-oriented active DBMS. Finally, the functionality supported by this architecture and its extensibility are analyzed along with the experiences gained. > |
