我在 PHP 中调用了函数mysql_stat()，结果如下：
我在 6 天前创建了数据库，但 uptime 表明它是近 90 天前（或者这是服务器的最后一次重启？）
slow query 的查询阈值是多少？
我可以检查一下，哪些查询慢？
如果我的数据库中只有 3 个表，open Tables 怎么可能是 6？
Threads、Opens 和 Flush tables 这些条目的含义是什么？
是否可以重置统计信息？
【问题讨论】：
标签： php mysql statistics
由于 PHP DOCS 不鼓励使用 mysql 扩展名。请改用mysqli。
字段含义：
o Uptime
The number of seconds the MySQL server has been running.
o Threads
The number of active threads (clients).
o Questions
The number of questions (queries) from clients since the server was
started.
o Slow queries
The number of queries that have taken more than long_query_time
seconds. (MySQL DOSC "The Slow Query Log" section).
o Opens
The number of tables the server has opened.
o Flush tables
The number of flush-*, refresh, and reload commands the server has
executed.
o Open tables
The number of tables that currently are open.
o Memory in use
The amount of memory allocated directly by mysqld. This value is
displayed only when MySQL has been compiled with safemalloc, which
is available only before MySQL 5.5.6.
o Maximum memory used
The maximum amount of memory allocated directly by mysqld. This
value is displayed only when MySQL has been compiled with
safemalloc, which is available only before MySQL 5.5.6.
要重置此值，请在您的 mysql 服务器终端中使用 #> mysqladmin flush-host。
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如果您的网站托管在共享主机中，则该信息可能来自多个数据库，而不仅仅是您的！ :)
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