对象历史作为活动OODB的基础

Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96 Pub Date : 1996-09-09 DOI:10.1109/DEXA.1996.558263

J. V. D. Akker, A. Siebes

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引用次数: 3

摘要

活动数据库和临时数据库之间存在几个链接。通过观察到规则是由数据库的特定演化触发的，可以总结出这些规则。利用基于对象的活动数据库编程语言DEGAS讨论活动数据库与时态数据库之间的关系。为了实现完整的活动数据库功能，DEGAS对象记录其完整的历史。因此，提供了支持单一时态维度的时态数据库所需的所有数据。此外，DEGAS的活动行为的语义是根据对象历史直接定义的。最后，我们从活动数据库的角度讨论了用第二个时间维度(以实现完整的时间功能)扩展DEGAS的优缺点。

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Object histories as a foundation for an active OODB

Several links exist between active and temporal databases. These are summarised by the observation that rules are triggered by a specified evolution of the database. We discuss the relation between active and temporal database using DEGAS, an object based active database programming language. To achieve full active database functionality, a DEGAS object records its complete history. Hence, all data needed for a temporal database supporting a single temporal dimension is provided. Furthermore, the semantics of the active behaviour of DEGAS are defined straightforwardly in terms of the object history. Finally we discuss the advantages and disadvantages of extending DEGAS with a second time dimension (to achieve full temporal functionality) from an active database perspective.

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Proceedings of 7th International Conference and Workshop on Database and Expert Systems Applications: DEXA 96

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