This will result in more accurate costing, and more optimal access plan.
这将导致更精确的成本计算和更优的访问计划。
This brings little overhead for compiling, but gives an optimal access plan.
这会增加一些编译负载,但却能够产生一个最优的存取计划。
The optimizer takes account of these changes and selects the optimal access plan when the job is executed.
而优化器会考虑这些变化,并且在作业执行时选择最佳访问计划。
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