...分布式查询优化 [gap=1147]Key words：cloud computing；dam as a service；data access in the cloud；distributed query optimization ...
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So most research of distributed query optimization aim at reducing communication cost.
所以大多数研究分布式查询优化以减少通讯开销为目标。
The method of distributed query optimization is analyzed deeply which use semi-join algorithm and query tree disassembling.
并用实例证明其相对于没有进行分布式查询优化的算法可以大大减少网络上传输的数据量。
In the distributed query optimization, both local processing cost and transmission cost should be thought over simultaneously.
在分布式查询优化中，应同时考虑本地处理代价和传输代价。
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