有效的BCDM时态信息简化方法

Effective method of simplifying temporal information in BCDM

时态信息是管理决策中的重要支持信息,需求的不同造就了时态信息不同的表示方法。随着数据库与信息技术的深入发展,越来越需要简单高效的时态数据模型以方便时态信息的表示与处理。介绍了BCDM模型及其时态表示思想,讨论了模型中事务时间和有效时间表示在查询优化时存在的问题,提出了一种基于BCDM的时态信息简化方法,不但能够有效的保存数据库现有的时态信息,而且能够大大简化有效时间的表示,为时态数据的查询优化奠定了良好基础。

Temporal information is important to management decision. Different requirements result to different presentation methods of temporal information. With a deeper development of database and information technology, the need of simple temporal data model becomes more urgent in order to give advantages to temporal information expressing and processing. The BCDM model and the idea of its temporal information expressing is introduced, then the existing problems of transaction time and valid time expressing with regard to query optimazation is discussed, Finally an effective method of simplifying temporal information in BCDM is put forward. By this method, not only can the existing temporal information be effectively maintained, but also can valid time expressing be simplifed largely, which provides a good basis to query optimazaion of temporal data.