第二，自动采样相对于手工固化采样比例具有更多的灵活性。
Second, AUTO sample size is more flexible than a fixed sampling percentage.
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。
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.
自动采样相对于手工固定采样比例的优势可以提现在两个方面。
The advantage of using AUTO sample size over a fixed number is two-folds.
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