%0 Journal Article
%T Query Decomposition and Optimization in Heterogeneous Data Integration System<br>异构数据源集成系统查询分解和优化的实现
%A WANG Ning
%A WANG Neng-bin
%A <br>王宁
%A 王能斌
%J 软件学报
%D 2000
%I 
%X A heterogeneous data integration system can integrate a broad range of data sources including WWW.Decomposition and optimization for query are very difficult because some data sources have neither regular schemata nor strong query capabilities.To help query decomposition and optimization,a dynamic dictionary is proposed as unified schemata for various heterogeneous data sources,and the way for the construction of a global dynamic dictionary by operating on dynamic dictionaries of local data sources is given.Furthermore,to simplify the design of wrappers for data sources with limited capabilities and reduce responding time for query,an approach,which can take advantage of all powers of various data sources and results of prior queries,is proposed for query decomposition and optimization.
%K Heterogeneous data source
%K data integration
%K dynamic dictionary
%K query decomposition
%K query optimization
%K query capability
%K cache<br>异构数据源
%K 数据集成
%K 动态字典
%K 查询分解
%K 查询优化
%K 查询能力
%K 缓存.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7735F413D429542E610B3D6AC0D5EC59&aid=4522E6CED3398FB3&yid=9806D0D4EAA9BED3&vid=708DD6B15D2464E8&iid=0B39A22176CE99FB&sid=8B59EA573021D671&eid=CA5852BD1A173B3A&journal_id=1000-9825&journal_name=软件学报&referenced_num=47&reference_num=16