在本例中，我们将只跟踪缓冲池服务组件。

In this case, we will trace only the buffer pool services component.

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该查询只返回命中率低于90%的缓冲池。

The query returns only the buffer pools that have a lower hit ratio than 90%.

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注意，因为这段代码只处理缓冲区，所以除了大写转换特有的函数调用之外几乎没有特殊代码。

Note that since this code only deals with buffers, there is almost no code except the function call which is specific to uppercase-conversion.

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