The experiments prove that th~ rewriter rules are effective and genetc algorithm has obvious advantage while processing multi-join query.
结果表明，本文提出的重写规则是很有效的，遗传算法在处理多连接查询时具有明显的优越性。
参考来源 - 关系数据库查询优化技术的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
多连接查询优化是并行数据库系统的核心问题。
The multi-join query optimization is the critical problem of parallel query optimization in parallel database system.
多连接查询优化；
多连接查询优化是提高数据库性能的关键问题之一。
Query optimization for large join queries is one of the key factors to improving the performance of database systems.
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