mysql中的interactive_timeout和wait_timeout
interactive_timeout和wait_timeout(mysql8小时)
mysql默认的interactive_timeout和wait_timeout时间是28800秒,也就是我们所说的8小时问题引起的原因
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
mysql> show global 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 | <--
+-----------------------------+----------+
interactive_timeout
interactive_timeout指mysql服务器关闭交互连接方式超时的时间,如cmd模式下与mysql交互式查询
wait_timeout
wait_timeout指mysql服务器关闭非交互连接方式超时的时间,如jdbc的连接这种方式
使用控制变量法来测试,然后通过交互式连接方式和非交互式连接分别来查看interactive_timeout和wait_timeout相互受影响的情况
1.先设置global interactive_timeout=30
mysql> set global interactive_timeout=30;
Query OK, 0 rows affected
mysql> show global 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 | 30 | <--
| 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通过命令行来交互式访问
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 | 30 | <--
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 3600 |
| wait_timeout | 30 | <--
+-----------------------------+----------+
12 rows in set (0.00 sec)
//after 30 seconds
mysql> select 1;
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql> select 1;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 4
Current database: *** NONE ***
+---+
| 1 |
+---+
| 1 |
+---+
1 row in set (0.01 sec)
可以看到interactive_timeout和wait_timeout都变成了30,并且30秒之后，客户端与mysql服务器失去连接,mysql服务器关闭了连接
非交互式访问
C:\Users\dxjm>mysql -uroot -p -e "select VARIABLE_NAME,VARIABLE_VALUE
from information_schema.SESSION_VARIABLES where VARIABLE_NAME like '%timeout%'"
Enter password: ******
+-----------------------------+----------------+
| VARIABLE_NAME | VARIABLE_VALUE |
+-----------------------------+----------------+
| INNODB_FLUSH_LOG_AT_TIMEOUT | 1 |
| RPL_STOP_SLAVE_TIMEOUT | 31536000 |
| DELAYED_INSERT_TIMEOUT | 300 |
| INNODB_ROLLBACK_ON_TIMEOUT | OFF |
| NET_WRITE_TIMEOUT | 60 |
| CONNECT_TIMEOUT | 10 |
| SLAVE_NET_TIMEOUT | 3600 |
| LOCK_WAIT_TIMEOUT | 31536000 |
| INNODB_LOCK_WAIT_TIMEOUT | 50 |
| INTERACTIVE_TIMEOUT | 30 | <--
| WAIT_TIMEOUT | 28800 | <--
| NET_READ_TIMEOUT | 30 |
+-----------------------------+----------------+可以看到interactive_timeout=30而wait_timeout=28800,即wait_timeout没有变化
2.设置global wait_timeout=50
mysql> set global wait_timeout=50;
Query OK, 0 rows affected
mysql> show global 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 | 30 | <--
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 3600 |
| wait_timeout | 50 | <--
+-----------------------------+----------+
12 rows in set通过命令行来交互式访问
C:\Users\dxjm>mysql -uroot -p
Enter password: ******
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 267
Server version: 5.6.24-log MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
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 | 30 | <--
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| rpl_stop_slave_timeout | 31536000 |
| slave_net_timeout | 3600 |
| wait_timeout | 30 | <--
+-----------------------------+----------+
12 rows in set (0.00 sec)
//after 30 seconds
mysql> select 1;
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql> select 1;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 4
Current database: *** NONE ***
+---+
| 1 |
+---+
| 1 |
+---+
1 row in set (0.01 sec)
可以看到interactive_timeout=30,而wait_timeout=30而不是变成了50
非交互式访问
C:\Users\dxjm>mysql -uroot -p -e "select VARIABLE_NAME,VARIABLE_VALUE
from information_schema.SESSION_VARIABLES where VARIABLE_NAME like '%timeout%'"
Enter password: ******
+-----------------------------+----------------+
| VARIABLE_NAME | VARIABLE_VALUE |
+-----------------------------+----------------+
| INNODB_FLUSH_LOG_AT_TIMEOUT | 1 |
| RPL_STOP_SLAVE_TIMEOUT | 31536000 |
| DELAYED_INSERT_TIMEOUT | 300 |
| INNODB_ROLLBACK_ON_TIMEOUT | OFF |
| NET_WRITE_TIMEOUT | 60 |
| CONNECT_TIMEOUT | 10 |
| SLAVE_NET_TIMEOUT | 3600 |
| LOCK_WAIT_TIMEOUT | 31536000 |
| INNODB_LOCK_WAIT_TIMEOUT | 50 |
| INTERACTIVE_TIMEOUT | 30 | <--
| WAIT_TIMEOUT | 50 | <--
| NET_READ_TIMEOUT | 30 |
+-----------------------------+----------------+可以看到interactive_timeout=30不变，wait_timeout=50,即刚刚设置的值