摘要
分布式数据库系统的分布和冗余使查询处理复杂化,因此分布式查询处理的优化显得尤为重要。半连接操作是查询技术中的非常有效和重要的技术。分析分布式数据库中半连接操作的过程以及执行代价,比较两种半连接操作的执行代价评估,介绍SDD-1算法。
The distribution of distributed database system and redundancy of data distributed has increased much complexity to the setting of enquiry,so the optimization for the setting of enquiry distributed seems particularly important.Semi-join operating is very efficient and important in query optimizing.Analyses procedure of semi-join operation in distribute database and its executing cost.Compares the optimizing result of two semi-join operating and discusses SDD-1 algorithm.
出处
《现代计算机》
2010年第9期40-43,共4页
Modern Computer
关键词
分布式数据库
查询优化
半连接操作
Distributed Database
Query Optimizing
Semi-Join Operating
