Decomposition and optimization of global query is one of hard problems in heterogeneous database integration.
全局查询的分解与优化是异构数据库的集成中许多难题之一。
An optimization method based on the linear decomposition and the model coordination for the design of engineering systems is described.
结合线性分解法和模型协调法提出了一个适用于一般工程系统设计的优化方法。
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。
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