Integrity maintenance in a heterogeneous engineering database environment
Data & Knowledge Engineering
The object database standard: ODMG 2.0
The object database standard: ODMG 2.0
A Middleware Implementation of Active Rules for ODBMS
DASFAA '99 Proceedings of the Sixth International Conference on Database Systems for Advanced Applications
Formal Semantics of Composite Events for Distributed Environments
ICDE '99 Proceedings of the 15th International Conference on Data Engineering
Evaluating CORBA latency and scalability over high-speed ATM networks
ICDCS '97 Proceedings of the 17th International Conference on Distributed Computing Systems (ICDCS '97)
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Throughout many research and development projects for active rule systems, active rules are implemented with different syntax and semantics. It becomes one of the stumbling blocks to apply active database systems especially in networked heterogeneous multidatabase environments. Utilizing the recent development of CORBA and ODMG standards, an active rule system is developed for heterogeneous ODBMS. Active rules represented in an ECA type are managed by a rule base. When events included in application database programs are detected, triggered rules by the events are retrieved from the rule base over network and interpreted dynamically. To ensure fast interpretations, the rules are stored in a bytecode format. Separation of rule-managing function will allow updating rules anytime without modifications in application programs or DBMS. The changes in rules will be reflected instantly in application programs via dynamic interpretation. The active rule system described is applied for integrity maintenance of spatial objects. With experimental results, overheads of byte code interpretation and runtime retrieval of triggered rules through network are discussed.