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Issue No. 03 - May/June (2003 vol. 15)
ISSN: 1041-4347
pp: 597-612
Susan D. Urban , IEEE Computer Society
Taoufik Ben Abdellatif , IEEE Computer Society
Suzanne W. Dietrich , IEEE Computer Society
<p><b>Abstract</b>—Delta abstractions are introduced as a mechanism for managing database states during the execution of active database rules. Delta abstractions build upon the use of object deltas, capturing changes to individual objects through a system-supported, collapsible type structure. The object delta structure is implemented using object-oriented concepts such as encapsulation and inheritance so that all database objects inherit the ability to transparently create and manage delta values. Delta abstractions provide an additional layer to the database programmer for organizing object deltas according to different language components that induce database changes, such as methods and active rules. As with object deltas, delta abstractions are transparently created and maintained by the active database system. We define different types of delta abstractions as views of object deltas and illustrate how the services of delta abstractions can be used to inspect the state of active rule execution. An active rule analysis and debugging tool has been implemented to demonstrate the use of object deltas and delta abstractions for dynamic analysis of active rules at runtime.</p>
Active database systems, object deltas, rule analysis and debugging.

S. D. Urban, T. Ben Abdellatif, A. Sundermier and S. W. Dietrich, "Delta Abstractions: A Technique for Managing Database States in Runtime Debugging of Active Database Rules," in IEEE Transactions on Knowledge & Data Engineering, vol. 15, no. , pp. 597-612, 2003.
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