实践证明，这些技术和方法不仅能够快速有效地实现并行数据库管理系统，也能够有效地进行并行数据库查询的优化和处理。

It is shown by the prototype system that the proposed algorithms and techniques are very efficient and effective for query optimization and...

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查询优化是并行数据库系统的核心技术。

Query optimization is the critical technique of parallel database systems.

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这些算法和相应的查询优化处理器已用于作者自行设计的并行数据库管理系统原型。

A complete set of a algorithms and techniques are proposed. the algorithms and techniques have been used in a prototype parallel database system designed by the author.

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