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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In addition, a general expansion of lip ear hashing and the results of simulation of performance of the method are given as well.

此外，本文还对线性散列技术作了一般性扩充，并通过模拟实验研究了方法的性能。

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Analyzed some typical P2P based search method and found they were composed by specific architecture and three basic methods: flooding, indexing and hashing.

分析了当前比较典型的P 2 P搜索技术，指出这些搜索方法都是由三种基本方法：洪泛、哈希和索引，结合一定的网络拓扑组合而成的。

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