First, when auto sample size is specified, the system automatically determines the appropriate sampling percentage.
首先，如果采用自动采样比例，系统可以自动决定合适的采样比例。
A fixed sampling percentage size that was good at some point in time may not be appropriate after the data distribution in the table has changed.
手工固化采样比例在某一时间点可能是较好的，但是在数据分布发生变化后就可能不再那么合适了。
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