它们返回高命中率sql语句，例如耗用排序时间最多的语句。

They return heavy hitter SQL statements, for example, the statement that consumed the most sort time.

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然而这次救济活动只产生了短暂的光环效应：直升机返回阿富汗后，美国的支持率又回落到个位数。

The relief campaign had only a temporary halo effect, however: When the helicopters returned to Afghanistan, American approval ratings fell back into the single digits.

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问题查询：这些查询只返回超过重要性能计数器阈值的行，例如缓冲池命中率不到90%的行。

Problem queries: These queries return only rows that exceed thresholds for important performance counters, for example, rows with buffer pool hit ratio lower than 90%.

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