XML查询优化的面向路径可扩展模型  

An oriented extensible model for XML query optimization

作　　者：吴恒山[1] 吴亚辉[1] 班鹏新[1] 

机构地区：[1]华中科技大学计算机科学与技术学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2004年第3期62-64,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家高技术研究发展计划资助项目 (2 0 0 2AA4Z3110 )

摘　　要：通过XQuery中的路径表达式的处理提出了一种更为完整和灵活的查询优化模型 ,称之为POEM (面向路径的可扩展模型 ) .与现有的解决方案不同 ,模型先给出路径表达式的形式化描述———查询路径图 ,并根据路径表达式查询中影响性能的关键因素———结构连接建立了POEM查询优化模型 .This paper presented a new flexible model called POEM (Path Oriented Extensible Model). Unlike the existing solutions, the formal description of the path expression was focused on and the POEM optimization model was built according to the structural join. This model was the key factor of the query performance issues in the path expression evaluation. The performance of POEM was analyzed and compared with original non-optimization approach.The experimental results were presented.

关 键 词：路径表达式 结构连接 查询路径图 面向路径的可扩展模型 

分 类 号：TP311.131[自动化与计算机技术—计算机软件与理论]