[Mysql/MariaDB] 清除及設定 MySQL 的死連接

資料來源: http://n.sfs.tw/content/index/10657

01.查看目前的連線

mysql> SHOW PROCESSLIST;
+-------+------+-----------------+------+---------+------+-------+------------------+
| Id    | User | Host            | db   | Command | Time | State | Info             |
+-------+------+-----------------+------+---------+------+-------+------------------+
| 14850 | axer | localhost       | NULL | Query   |    0 | NULL  | SHOW PROCESSLIST |
| 14852 | note | localhost:62258 | note | Sleep   |    0 |       | NULL             |
+-------+------+-----------------+------+---------+------+-------+------------------+
2 rows in set (0.00 sec)

02.刪除連線

mysql> kill 14852;

03.查看及修改等待結束的時間

mysql> show variables like '%timeout%';
+-----------------------------+----------+
| Variable_name               | Value    |
+-----------------------------+----------+
| connect_timeout             | 10       |
| delayed_insert_timeout      | 300      |
| innodb_flush_log_at_timeout | 1        |
| innodb_lock_wait_timeout    | 50       |
| innodb_rollback_on_timeout  | OFF      |
| interactive_timeout         | 28800    |
| lock_wait_timeout           | 31536000 |
| net_read_timeout            | 30       |
| net_write_timeout           | 60       |
| rpl_stop_slave_timeout      | 31536000 |
| slave_net_timeout           | 3600     |
| wait_timeout                | 28800    |
+-----------------------------+----------+
12 rows in set (0.00 sec)

04.執行期修改等待秒數，設定為180秒

mysql> set wait_timeout=180;

05.永久設定，修改 /etc/my.cnf

[mysqld]
wait_timeout=180

重啟後生效