基于半联接的分布式查询优化策略

Query optimization tactics of semi-connection in distributed system

在分析比较分布式数据库系统和集中式数据库系统查询优化目标不同特点的基础上，分析了分布式数据库系统的查询处理及查询优化，进而提出查询优化的策略，重点讨论了基于半联接的分布式查询优化方法。

When adding distributed data into the database system,the distributed query process is very difficult and complicated, and the cost of query process is different due to different query process tactics. Query optimization in distributed system is important and it has notable effect. This paper has discussed the methods of query optimization tactics of semi--connection in distributed system.