关键词: 联合查询 数据源 目标数据集合

Abstract:

This paper discuses the correlative technologies of WWW-based associated database query. Considering the characteristics that the data in the object data set distribute unevenly in each data source, and the problem of low-efficiency data query which exists in practical associated query operations, we   propose an improved optimization scheme for associated query, and prove its validity and feasibility.

Key words: （associated query, data source, object data set）