假设有一个针对非常大的表运行的查询，它使用同一个缓冲池并且需要读取比总的缓存区大小还多的页。

You might also have a query that runs against a very large table that USES the same buffer pool and involves reading more pages than the total buffer size.

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出于测试的目的，本示例只使用其中的一部分列：url、片段、标题、缓存大小、相关信息、主机名和查询关键字本身。

This sample only USES a portion of them: URL, snippet, title, cached size, related information present, host name, and the query keyword itself for test purpose.

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