This function is activated by selecting the appropriate check box, as shown in Figure 5.
通过选中相应的复选框来启用该功能，如图5所示。
Constructing an appropriate cost model has important effect on selecting a query plan.
构造一个合适的代价模型对查询计划的选择有着十分重要的影响。
Constructing an appropriate cost model has important effect on selecting a query plan.
构造一个合适的代价模型对查询计划的选择有着十分重要的影响。
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