基于信息容量的模式变换等价性研究

The Use of Information Capacity in Schema Transformation Equivalence Study

研究了多数据库模式集成过程中的模式变换等价性问题 .从信息容量的概念出发 ,给出了一种判断模式变换正确性的标准 ,并证明了在不同应用背景下 ,模式变换F :S1 →S2 的正确性等价于S1 和S2 之间满足某种蕴含关系 .本文还利用该标准对一种经典模式变换方法进行了分析 ,指出如果没有完全满足该标准 。

In this paper, we carefully explore the assumptions behind using information capacity equivalence as a measure of correctness for judging transformed schemas in schema integration methodologies. A new definition of correctness for judging transformed schemas is presented. Typical methodology is examined and how anomalies can arise when using those that do not meet the proposed correctness criteria is also shown.