However, there are few multi - join query optimization methods based on pc clusters now.

然而, 目前在基于机群并行计算环境的多连接查询的优化算法的研究工作还很少.

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The multi - join query optimization is one of the the critical problem of parallel query optimization.

多连接查询的优化问题是并行查询优化的关键问题之一.

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