摘要
分布式数据库系统由于数据的分布和冗余使得分布式查询处理增加了许多新的内容和复杂性,因此分布式查询处理的优化显得尤为重要。本文将以分布式的药品采购数据库系统为例,简要介绍分布式查询优化的目标、策略及基于关系代数等价变换的优化算法。
Distributed data base system make because of distribution and redundancy of data distributed to inquire that has dealt with and increase a lot of new content and complexity, so inquire distributely that the optimization that deals with seems particularly important. This text will take distributed data base system of medical procurement as an example, brief to introduce distributed to inquire about goal that optimize, tactics and on the basis of relation algebra optimization algorithm that equivalence varied.
出处
《计算机应用与软件》
CSCD
北大核心
2003年第11期58-60,共3页
Computer Applications and Software
