【发布时间】：2017-08-02 19:24:05
【问题描述】：
当我运行命令查看我们的数据库变量时：
show status like "%onn%"
我发现2 连接到的人的连接太多：
MariaDB [(none)]> show status like "%onn%";
+-----------------------------------------------+-------+
| Variable_name | Value |
+-----------------------------------------------+-------+
| Aborted_connects | 0 |
| Connection_errors_accept | 0 |
| Connection_errors_internal | 0 |
| Connection_errors_max_connections | 0 |
| Connection_errors_peer_address | 0 |
| Connection_errors_select | 0 |
| Connection_errors_tcpwrap | 0 |
| Connections | 56711 |
| Max_used_connections | 11 |
| Performance_schema_session_connect_attrs_lost | 0 |
| Slave_connections | 0 |
| Slaves_connected | 0 |
| Ssl_client_connects | 0 |
| Ssl_connect_renegotiates | 0 |
| Ssl_finished_connects | 0 |
| Threads_connected | 5 |
| wsrep_connected | ON |
+-----------------------------------------------+-------+
17 rows in set (0.00 sec)
连接数没有下降。它一直在增加。
CPU Utilization (Percent): 0.82%
KiB Mem : 4045012 total, 1625720 free, 718928 used
如何诊断此问题以找到根本原因？
它崩溃了，我怀疑它可能会再次崩溃。
更新：根据MySQL show status - active or total connections?，Threads_connected 是我应该寻找打开连接的值。呸！太好了！
但是，我的processlist 可能非常可疑。注意到Time 列了吗？他们应该有那么高吗？
MariaDB [(none)]> SHOW FULL processlist;
+------+---------------+-----------------+------------+---------+-------+-------------------------+-----------------------+----------+
| Id | User | Host | db | Command | Time | State | Info | Progress |
+------+---------------+-----------------+------------+---------+-------+-------------------------+-----------------------+----------+
| 1 | system user | | NULL | Sleep | 23321 | wsrep aborter idle | NULL | 0.000 |
| 2 | system user | | NULL | Sleep | 3955 | committed 3040010 | NULL | 0.000 |
| 5 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 6 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 3 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 4 | system user | | NULL | Daemon | NULL | | NULL | 0.000 |
| 7 | system user | | NULL | Daemon | NULL | InnoDB shutdown handler | NULL | 0.000 |
| 9 | system user | | NULL | Sleep | 3957 | committed 3040009 | NULL | 0.000 |
| 10 | system user | | NULL | Sleep | 3950 | committed 3040033 | NULL | 0.000 |
| 11 | system user | | NULL | Sleep | 3954 | committed 3040022 | NULL | 0.000 |
| 12 | system user | | NULL | Sleep | 3954 | committed 3040020 | NULL | 0.000 |
| 16 | system user | | NULL | Sleep | 3953 | committed 3040030 | NULL | 0.000 |
| 17 | system user | | NULL | Sleep | 3949 | committed 3040034 | NULL | 0.000 |
| 15 | system user | | NULL | Sleep | 3953 | committed 3040031 | NULL | 0.000 |
| 9670 | xxx | localhost:51574 | tabl_name | Sleep | 4 | | NULL | 0.000 |
| 9671 | xxx | localhost:51576 | NULL | Sleep | 53 | | NULL | 0.000 |
| 9939 | xxx | localhost | NULL | Sleep | 123 | | NULL | 0.000 |
| 9942 | xxx | localhost | NULL | Query | 0 | init | SHOW FULL processlist | 0.000 |
+------+---------------+-----------------+------------+---------+-------+-------------------------+-----------------------+----------+
18 rows in set (0.00 sec)
【问题讨论】：