摘要
分布式数据库系统由于数据的分布和冗于使得分布式查询处理增加了许多新的内容和复杂性 ,不同的查询处理方法 ,其查询的费用和并行处理程度是大不一样的 ,因此 ,分布式数据库系统的查询优化较集中式数据库系统更重要 ,效果更显著。根据分布式数据库系统的特点 ,简要介绍分布式查询优化的目标。
For the distributed data base system,many new contents and complexities of inquiry treatment will be increased because of distribution and superfluity of data. The great distinction of expenses of inquiry and the parallel running processing level will be occurred to the different inquiry methods. Therefore, the inquiry optimization of distributed data base system is more important than the centralized data base system and the result is more remarkable. According to the characteristic of the distributed data base system, the optimum objects, tactics and methods of distributed inquiry system are introduced briefly.
出处
《东北电力学院学报》
2003年第4期12-15,共4页
Journal of Northeast China Institute of Electric Power Engineering
