MySQL 在活动或总连接方面的状态是什么?
活动或总连接可以通过 threads_connected 变量了解。该变量说明了当前的打开连接数。
查询如下 −
mysql> show status where `variable_name` = 'Threads_connected';
输出如下。
+-------------------+-------+ | Variable_name | Value | +-------------------+-------+ | Threads_connected | 1 | +-------------------+-------+ 1 row in set (0.06 sec)
我们可以通过 show 命令查看相同的内容。查询如下 −
mysql> show processlist;
输出如下。
+----+-----------------+-----------------+----------+---------+--------+------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-----------------+-----------------+----------+---------+--------+------------------------+------------------+ | 4 | event_scheduler | localhost | NULL | Daemon | 349012 | Waiting on empty queue | NULL | | 11 | root | localhost:54746 | business | Query | 1 | starting | show processlist | +----+-----------------+-----------------+----------+---------+--------+------------------------+------------------+ 2 rows in set (0.31 sec)
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