谈分布式数据库查询优化

On Distributed Database Query Optimization

分布式数据库系统是计算机网络技术与数据库技术互相渗透和有机结合的产物。具有数据独立性、集中与自制相结合的控制机制、适当增加数据冗于、事务管理的分布性等特点。有了分布透明性,用户的查询程序书写起来就如同数据没有分布一样,使系统使用起来更简单、有效。但是由于数据的分布和冗于,使得分布式数据库系统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更为重要。

The distributional database system is the computer network technology and the data bank technology seeps and the organic synthesis product mutually.Has control which the data independence, the centralism and the self-restraint unify machine-made, suitable increase data excess in, business management characteristics and so on distributivity. Had the distribution transparency, user＇ s inquiry procedure has written has been dissimilar on the like data distribution, causes the system to use is simpler, is effective.But as a result of the data distribution and excess in, caused distributional database system inquiry processing to increase many new contents and the complexity, therefore the distributional inquiry processing optimization appeared importantly.