MySQL 显示状态 - 事件连接数还是总连接数？

Question

当我运行 show status like 'Con%' 时，它显示连接数，为 9972 个，并且在不断增长。这是活跃连接数还是总连接数？

Answer 1

根据the docs ，表示历史上的总数:

Connections

The number of connection attempts (successful or not) to the MySQL server.

您可以通过 Threads_connected 查看事件连接数状态变量:

Threads_connected

The number of currently open connections.

mysql> show status where `variable_name` = 'Threads_connected';
+-------------------+-------+
| Variable_name     | Value |
+-------------------+-------+
| Threads_connected | 4     |
+-------------------+-------+
1 row in set (0.00 sec)

...或通过show processlist命令:

mysql> show processlist;
+----+------+-----------------+--------+---------+------+-------+------------------+
| Id | User | Host            | db     | Command | Time | State | Info             |
+----+------+-----------------+--------+---------+------+-------+------------------+
|  3 | root | localhost       | webapp | Query   |    0 | NULL  | show processlist | 
|  5 | root | localhost:61704 | webapp | Sleep   |  208 |       | NULL             | 
|  6 | root | localhost:61705 | webapp | Sleep   |  208 |       | NULL             | 
|  7 | root | localhost:61706 | webapp | Sleep   |  208 |       | NULL             | 
+----+------+-----------------+--------+---------+------+-------+------------------+
4 rows in set (0.00 sec)