使用限制候选区域和两次阈值分割的方法减少计算量，提高了计算精度。
And the method of limited candidate region and twice thresholds was used to reduce computation load and improve precision.
在这种模式下，服务器允许您定义一个数据改变阈值，并且只有在数据自最近一次建立后的变化超过了阈值才会刷新统计数据。
In this mode, the server allows you to define a data change threshold and refresh statistics only if the data has changed beyond the threshold since they were last built.
如图11所示，您可以定义一个名为StockApp的profile，每15分钟回放一次脚本buystock，然后为其定义一个性能阈值。
As shown in the Figure 11, you can define a profile named StockApp to playback the script BuyStock every 15 minutes, and define the performance threshold for it.
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