The optimal plans are determined by calculating comprehensively-evaluated values and creating the mathematical expressions of fuzzy subjection degree for diverse quantitative indexes.

建立了定量指标模糊隶属度的数学表达式。 通过计算综合评价值，从而确定出最优方案。

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However, if literals are important to get optimal access plans, the shorter execution times of the SQL statements are more important than the elegancy of the application's source code.

但是，如果文本对于获取最优访问计划很重要，那么更短的sql语句执行时间比应用程序源代码的优雅性更重要。

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The optimizer relies on statistics to properly cost alternative query execution plans (QEPs) and choose the most optimal plan.

优化器是依靠统计信息来计算可选查询执行计划（QEP）的开销，同时选择出最优的计划。

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You construct a number of plans for achieving that future, picking the optimal one.

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You construct a number of plans for achieving that life, picking the optimal one, i.e. the one that will get you there in the shortest time, or with the least amount of effort or will produce the most pleasant journey.

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The road map says that an optimal path would require a larger cut by 2020 but that, as luck would have it, the optimal reduction, set at 25%, is what will be realised by existing plans for more renewable energy and improved energy efficiency if they work out.

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