数据集成系统中的动态查询处理  

Dynamic query processing for data integration system

作　　者：李征[1] 查杰民[1] 

机构地区：[1]江苏大学计算机科学与通信工程学院,江苏镇江212013

出　　处：《计算机工程与设计》2005年第7期1894-1896,共3页Computer Engineering and Design

摘　　要：为实现数据集成查询我们会用到查询优化器,而传统的查询优化器生成的执行计划会由于以下几个原因产生不良的结果:成本估计不正确,运行时可用的内存不足和数据传输率无法预测,所有这些问题都要求助于动态策略来修正静态的查询执行计划。介绍了一个动态的查询处理框架和这个框架用到的动态策略。Execution plans produced by traditional query optimizers for data integration queries may yield poor performance for several reasons. The cost estimates may be inaccurate, the memory available at run-time may be insufficient, or the data delivery rate can be unpredictable. All these problems have led we to resort to dynamic strategies to correct or adapt the static QEP. The different basic techniques were identified that must be integrated in a dynamic query engine to solve the problem of unpredictable data arrival rates, a dynamic query processing architecture was proposed which includes three dynamic layers： the dynamic query optimizer, the scheduler and the query processor.

关 键 词：动态查询处理 查询重优化 查询调度 数据集成系统 

分 类 号：TP392[自动化与计算机技术—计算机应用技术]