现在优化的代码比未优化的代码运行速度更快，您可以通过比较每次运行的时间间隔看到这一点。
The optimized code is now running faster than the non-optimized code, which you can see by comparing the interval times of each run.
估算成本是优化器用来比较查询计划的成本单元。
The estimated costs are cost units that the optimizer uses to compare query plans.
采用这些方法，他们能够使比较缺乏的IT资金最优化，并且能够集中精力开发出能够提供最大商业利润的软件特性。
By doing so, they can optimize the value of scarce it dollars and concentrate efforts on developing software features that provide the greatest business benefit.
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