半联接计划的全局查询优化策略研究

摘要

The data distribution in Database systems of a distributed data processing results in the complexity of the query processing.It needs to consider the network flows,response duration,algorithms complexity factors,etc.In the network environment,reducing the amount of data transmission can greatly improve query efficiency.One of the query optimizer methods is to reduce the amount of data transmission by effective join methods.%在分布式数据库系统中数据的分布导致查询处理复杂化,它需要考虑网络流量、响应时间、算法复杂度等多种因素。在网络环境中,减少数据的传输量能够极大的提高查询效率,探讨基于半联接计划减少数据传输量的全局查询优化策略。