向数据库中写入日志比向文本文件中写入日志要慢一点，尤其是在忙碌的站点上，而且数据库会变得很大以至于维护成为一个问题。

Logging to a database is somewhat slower than logging to text files, especially at busy sites, and the size of the database can become large so that maintenance becomes an issue.

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如果启用了慢查询日志，则查询将记录到慢查询日志文件中。

If the slow query log is enabled, the query is logged to the slow query log file.

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