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。
It's pointed out that a major design element for performance is the query cache.
需要指出的是关于性能的主要设计要素是查询缓存。
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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