In view of the significance of query decomposition and optimization in the Heterogeneous Data Resource Integration System, in-depth research on this aspect was mainly conducted.
考虑到查询分解及查询优化在异构数据集成系统中的重要意义，主要就这一方面进行了深入研究。
Query optimization: the goals of query optimization in distributed data integration system are different from those in traditional database system.
查询优化：分布式数据集成系统查询优化的目标与集中式数据库有所不同。
Simulation results show that this algorithm has a better performance of query optimization in data integration system, no matter how many the query relations are.
仿真结果表明，该算法在数据集成系统环境中，无论参与查询的关系数目多少，均有较好的查询优化性能。
Simulation results show that this algorithm has a better performance of query optimization in data integration system, no matter how many the query relations are.
仿真结果表明，该算法在数据集成系统环境中，无论参与查询的关系数目多少，均有较好的查询优化性能。
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