摘要
本文研究了后端数据库机系统的二元联接优化策略。首先给出了衡量查询效率的优化指标,并提出了一个通用后端数据库系统模型,其次介绍了二元联接优化的模型和算法。最后,在TDM系统上分析了该算法,证明确实能改善系统的查询效率。
This paper researches into binary join optimizing strategies of backend database machine systems. First of all, the optimizing targets being used to examine query efficiencies are given, and a unifying model of backend machine systems is advanced. Then, the model and the algorithm about binary join optimizations are introduced. Lastly, this paper analyzes the algorithm in the TDM environment, and proves that the algorithm does greatly improve the query effieieneies of the system.
