分布式数据库查询优化策略研究

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。本文简要介绍分布式查询优化的目标、策略,并针对分布式数据库系统的查询优化,讲述三个典型的算法:INGRES算法、SystemR*算法、SDD-1算法,并进行对比、优化、总结,最后对SDD-1算法进行改进。

Query Optimization Tactics in Distributed Database System

Distributed database system has dealt with and increase a lot of new content and complexity because of distribution and redundancy of data distributed to inquire,so inquire distributedly that the optimization that deals with seems particularly important.This text will be brief to introduce the goal and tactics of distributed query optimization,and on the basis of optimization to the inquiry of the distributed database system,discussed three typical algorithms:INGRES algorithm,System R* algorithm,SDD-1 algorithm,and compare with,optimize,summarize.Improve SDD-1 algorithm finally.The goal of this paper is telling us about the problems of distributed database systems such as query processing.