然后，优化器可以将输入变量的值与编目统计进行比较，并为谓词计算出一个更好的选择估计。

The optimizer can then compare the input variable values to catalog statistics and compute a better selectivity estimate for predicates.

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如果响应时间比较慢，处理器使用也比较低，可能是服务器没有足够的线程用于处理输入请求。

If response times are slow even though processor utilization is low, the server may not have enough threads to handle incoming requests.

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本文提出了一种在输入信号上升延迟滞的比较器电路。

This paper introduces a hysteresis comparator whose output can be delayed when the input signal is in rising time.

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