分布式数据查询优化算法的研究

A study of optimized algorithm for distributed data query

分布式数据查询是分布式数据库管理系统的核心,而查询优化算法又是查询处理中的关键技术。分布式数据库管理系统的研究始于20世纪70年代中期,在30多年的发展中,取得了丰硕的成果。但由于分布式数据的分散性,使分布式数据查询比集中式数据查询复杂得多。本文对基于关系代数优化的算法进行了探讨和研究,并应用于实例,取得了较好的优化效果。

The distributed data query is the core of the distributed database managing system,but the optimized query algorithm is the key technology in query processing.Because of the decentralization of the distributed data,making the distributed data query is more complex than the concentration data.The optimized algorithm based on relation algebra is studied and discussed in this paper,it has been applied in example,obtained better the optimized result.