Abstract: The integration of heterogeneous data sources, which can effectively make use of the information sources and realize data sharing better, is a hotspot within the field of current data processing research. This paper describes an architecture of heterogeneous data integration system based on a Mediator-Wrapper middleware, and makes a deep research on the XQuery query processing, especially the key issues, such as query decomposition and optimization technology. This paper illustrates the realization of query decomposition and optimization with examples.

Key words: heterogeneous data sources, query decomposition, query optimization

摘要： 异构数据源的集成问题是当前数据处理领域内研究的热点，它能更有效地利用信息资源，更好地实现数据共享。介绍一种基于Mediator-Wrapper中间层的异构数据源集成系统框架，对XQuery查询处理过程及其关键问题，如查询分解和优化技术进行深入研究，并结合实例进一步说明异构数据源中查询分解和优化的具体实现。

关键词: 异构数据源, 查询分解, 查询优化

CLC Number: 

• TP311.52