摘要
主要介绍基于成本的数据库查询优化的一些基本概念,针对多表连接的三种方法:嵌套循环链接、归并连接和混合连接进行分析和阐述.并成本估算,列出估算公式,
Mainly presents some basic concept of database query optimization, and analyze the three multi-table join methods: nested loop join, merge join and hybrid join,give the cost of each join methods.
作者
崔育礼
尹长青
CUI Yu-li, YIN Chang-qing (School of Software Engineering, Tongji University, Shanghai 201804, China)
出处
《电脑知识与技术》
2008年第12期1540-1541,1544,共3页
Computer Knowledge and Technology