The catch, though, is that the query cache is disabled by default.
不过，问题是查询缓存在默认情况下是禁用的。
After you enable the query cache, it's important to understand whether it's being used effectively.
在启用查询缓存之后，重要的是要理解它是否得到了有效的使用。
MySQL has a feature called the query cache that stores the result of a query in memory, should it be needed again.
MySQL有一个特性称为查询缓存，它将（后面会用到的）查询结果保存在内存中。
It first invalidates the Query Cache.
它首先使查询缓存无效。
It first invalidates the Query Cache.
它首先使查询缓存无效。
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