Abstract
This article presents a system for maintaining static integrity constraints in data bases that uses the active data base paradigm. This system has been added to an active version of the O 2 object-oriented data base system, and it is fully functional. Constraints, specified by the user in a fist-order logic language, are transformed into production rules, which are stored in the data base. These rules are used to maintain the corresponding set of constraints for all applications that use the data base. We extend previous work on constraint maintenance in two ways: our system can be used as a constraint maintenance layer on top of object-oriented, relational, and nested relational data bases, and for object-oriented systems, we provide constraint support not only in the case of object composition, but also consider inheritance and methods.
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