网格环境下的数据库访问和集成.pdf

34 8 2008 4 Vol.34 No.8 Computer Engineering April 2008 · · 2008 A TP311.13 ( 430074) (GridDBAdmin)GridDBAdmin SQL SQL Globus OGSA-DAI Database Access and Integration on the Grid SHI Ke (School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan 430074) AbstractTo integrate existing database resources into the grid and encourage wider use of databases in a grid setting, a service-based database access and integration system, GridDBAdmin, is presented. GridDBAdmin provides a virtual global logical database view for the users and enables grid application to query existing multiple databases using SQL. The system is composed with MetaData Service(MDS) and Grid Virtual Database Service(GVDS). MDS searches the metadata catalog to find the physical databases that contain the required data. GVDS delegates global logical database and converts SQL query into search conditions to the physical databases, which uses a distributed query processing scheme to join multiple physical databases. Performance evaluation based on the response time shows the efficiency of the method. The system is fully implemented on the top of the Globus toolkit and OGSA-DAI. Key wordsdata grid; database access and integration; service; metadata; distributed query 1 (GridDBAdmin) 2 GridDBAdmin