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。

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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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The query processing in the distributed database systems is comprehensively summarized. This paper shows that using HASHING method for thereduction of semi-join communication cost is beneficial.

本文较全面地总结了分布式数据库系统的查询处理，并提出用HASHING 方法减少半连接通讯的开销是有利的。

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