mysql几个timeout参数_MySQL中 timeout相关参数解析
前言：
MySQL中有两个关于连接超时的配置项。他们之间在某些条件下会互相继承，那究竟这两个参数会在什么情况下起作用呢？
本文将会通过一些测试实例来证明总结两者的相互关系。
参数介绍：
The number of seconds the server waits for activity on an interactive connection before closing it. An interactive client is defined as a client that uses theCLIENT_INTERACTIVEoption tomysql_real_connect(). See alsowait_timeout.
The number of seconds the server waits for activity on a noninteractive connection before closing it. Before MySQL 5.1.41, this timeout applies only to TCP/IP connections, not to connections made through Unix socket files, named pipes, or shared memory.
On thread startup, the session wait_timeout value is initialized from the global wait_timeout value or from the global interactive_timeout value, depending on the type of client (as defined by the CLIENT_INTERACTIVEconnect option to mysql_real_connect()). See also interactive_timeout.
CLIENT_INTERACTIVE
Permitinteractive_timeoutseconds (instead ofwait_timeoutseconds) of inactivity before closing the connection. The client's sessionwait_timeoutvariable is set to the value of the sessioninteractive_timeoutvariable.
简单的说 interactive就是交互式的终端，例如在shell里面直接执行mysql，出现 mysql> 后就是交互式的连接。而mysql -e 'select 1' 这样的直接返回结果的方式就是非交互式的连接。
第二部分 测试
2.1 继承关系
Q：通过Socket连接 timeout会从哪个global timeout继承
A：由下例可见，通过socket登录，timeout 继承于global.interactive_timeout;
mysql>set global interactive_timeout = 11111;
Query OK, 0rows affected (0.00 sec)
mysql>set global wait_timeout = 22222;
Query OK, 0rows affected (0.00 sec)
mysql> showglobal variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout |OFF |
| interactive_timeout | 11111 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| wait_timeout | 22222 |
+----------------------------+----------+
10rows in set (0.00 sec)
mysql -uroot -ppassword -S /usr/local/mysql3310/mysql.sock
Welcometo the MySQL monitor. Commandsend with ;or \g.
Your MySQLconnection idis 4
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, Oracleand/or its affiliates.All rights reserved.
Oracleis a registered trademarkof Oracle Corporationand/or its
affiliates. Other names may be trademarksof their respective
owners.
Type'help;' or '\h' for help. Type'\c' to clear thecurrent input statement.
mysql> show session variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout |OFF |
| interactive_timeout | 11111 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| wait_timeout | 11111 |
+----------------------------+----------+
10rows in set (0.00 sec)
Q：通过TCP/IP client 连接， timeout会从哪个global timeout继承
A：由下例可见，通过TCP/IP client 连接后的wait_timeout 仍然继承于 global.interactive_timeout
mysql -uroot -ppassword -h 127.0.0.1--port 3310
Welcometo the MySQL monitor. Commandsend with ;or \g.
Your MySQLconnection idis 6
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, Oracleand/or its affiliates.All rights reserved.
Oracleis a registered trademarkof Oracle Corporationand/or its
affiliates. Other names may be trademarksof their respective
owners.
Type'help;' or '\h' for help. Type'\c' to clear thecurrent input statement.
mysql> show session variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout |OFF |
| interactive_timeout | 11111 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| wait_timeout | 11111 |
+----------------------------+----------+
10rows in set (0.00 sec)
2.2 起效关系
Q：timeout值，对于正在运行用的语句是否起效？
A：由下例可见SQL正在执行状态的等待时间不计入timeout时间
mysql>set session wait_timeout=10;
Query OK, 0rows affected (0.00 sec)
mysql>set session interactive_timeout=10;
Query OK, 0rows affected (0.00 sec)
mysql>select 1,sleep(20)from dual;
+---+-----------+
| 1 | sleep(20) |
+---+-----------+
| 1 | 0 |
+---+-----------+
1 rowin set (20.00 sec)
mysql>
mysql> show session variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| connect_timeout | 10 |
| delayed_insert_timeout | 300 |
| innodb_lock_wait_timeout | 50 |
| innodb_rollback_on_timeout |OFF |
| interactive_timeout | 10 |
| lock_wait_timeout | 31536000 |
| net_read_timeout | 30 |
| net_write_timeout | 60 |
| slave_net_timeout | 3600 |
| wait_timeout | 10 |
+----------------------------+----------+
Q：wait_timeout 和 interacitve_timeout 如何相互作用。
A：只有session.wait_timeout 会起效
mysql>set session interactive_timeout=10;
Query OK, 0rows affected (0.00 sec)
mysql>set session wait_timeout=20;
Query OK, 0rows affected (0.00 sec)
---------------------another connection-------------------------
mysql> showfull processlist;
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id |User | Host | db | Command |Time | State | Info | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| 1 | systemuser | |NULL |Connect | 103749 | Slave hasread all relay log; waitingfor the slave I/O threadto update it |NULL | 0 | 0 | 1 |
| 2 | systemuser | |NULL |Connect | 103750 | Connectingto master |NULL | 0 | 0 | 1 |
| 3 | root | localhost |NULL | Query | 0 |NULL | showfull processlist | 0 | 0 | 11 |
| 10 | root | localhost:58946 |NULL | Sleep | 20 | |NULL | 0 | 0 | 11 |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
4rows in set (0.00 sec)
mysql> showfull processlist;
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id |User | Host | db | Command |Time | State | Info | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| 1 | systemuser | |NULL |Connect | 103749 | Slave hasread all relay log; waitingfor the slave I/O threadto update it |NULL | 0 | 0 | 1 |
| 2 | systemuser | |NULL |Connect | 103750 | Connectingto master |NULL | 0 | 0 | 1 |
| 3 | root | localhost |NULL | Query | 0 |NULL | showfull processlist | 0 | 0 | 11 |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
3rows in set (0.00 sec)
Q：global timeout和session timeout哪个起作用。
A：只有session timeout 会起作用。
测试1：
mysql>set session interactive_timeout = 10;
Query OK, 0rows affected (0.00 sec)
mysql>set session wait_timeout = 10;
Query OK, 0rows affected (0.00 sec)
mysql> show session variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| interactive_timeout | 10 |
| wait_timeout | 10 |
+----------------------------+----------+
10rows in set (0.00 sec)
mysql> showglobal variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| interactive_timeout | 20 |
| wait_timeout | 20 |
+----------------------------+----------+
10rows in set (0.00 sec)
mysql> showfull processlist;
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id |User | Host | db | Command |Time | State | Info | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| 3 | root | localhost |NULL | Query | 0 |NULL | showfull processlist | 0 | 0 | 11 |
| 17 | root | localhost:60585 |NULL | Sleep | 10 | |NULL | 10 | 10 | 11 |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
2rows in set (0.00 sec)
mysql> showfull processlist;
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id |User | Host | db | Command |Time | State | Info | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| 3 | root | localhost |NULL | Query | 0 |NULL | showfull processlist | 0 | 0 | 11 |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
1rows in set (0.00 sec)
测试2：
mysql> show session variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| interactive_timeout | 20 |
| wait_timeout | 20 |
+----------------------------+----------+
10rows in set (0.00 sec)
mysql> showglobal variableslike '%timeout%';
+----------------------------+----------+
| Variable_name | Value |
+----------------------------+----------+
| interactive_timeout | 10 |
| wait_timeout | 10 |
+----------------------------+----------+
10rows in set (0.00 sec)
mysql> showfull processlist;
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id |User | Host | db | Command |Time | State | Info | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| 3 | root | localhost |NULL | Query | 0 |NULL | showfull processlist | 0 | 0 | 11 |
| 19 | root | localhost:50276 |NULL | Sleep | 19 | |NULL | 10 | 10 | 11 |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
2rows in set (0.00 sec)
mysql> showfull processlist;
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id |User | Host | db | Command |Time | State | Info | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| 3 | root | localhost |NULL | Query | 0 |NULL | showfull processlist | 0 | 0 | 11 |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
1rows in set (0.00 sec)
第三部分 总结
由以上的阶段测试可以获得以下结论。
1. 超时时间只对非活动状态的connection进行计算。
2. 超时时间指通过 session wait_timeout 起效。
3. 交互式连接的wait_timeout 继承于 global.interactive_timeout
非交互式连接的wait_timeout 继承于 global.wait_timeout
4. 继承关系和超时对 TCP/IP 和 Socket 连接均有效果
mysql几个timeout参数_MySQL中 timeout相关参数解析相关推荐
- mysql慢查询日志轮转_MySQL slow log相关参数解释
slow_query_log=1 #是否启用慢查询日志,1为启用,0为禁用 slow_query_log_file=slow.log #指定慢查询日志文件的路径和名字,可使用绝 ...
- python魔法参数_python中的魔法参数：*args和**kwargs
def foo(*args, **kwargs): print 'args = ', args print 'kwargs = ', kwargs print '------------------- ...
- mysql limit 动态参数_MySQL中limit使用动态参数的解决方法（拼接SQL字符串语句来执行SQL）...
官方好像说过limit已经在5.6版本上支持了动态参数,但是测试时依然还是不行. 那么要解决limit动态参数唯一能做的就是使用字符串SQL拼接的形式,然后再进行执行. 一般有以下方式解决: 1.存储 ...
- MySQL怎么存base64编码_MySQL中如何将字符串转为base64编码？
在MySQL中,TO_BASE64()函数将字符串转换为以base-64编码的字符串并返回结果.(相关推荐:<MySQL教程>) 语法TO_BASE64(str) 其中str是需要编码的字 ...
- mysql数据库回滚日志_MySQL中是如何实现事务提交和回滚的？
什么是事务 事务是由数据库中一系列的访问和更新组成的逻辑执行单元 事务的逻辑单元中可以是一条SQL语句,也可以是一段SQL逻辑,这段逻辑要么全部执行成功,要么全部执行失败 举个最常见的例子,你早上出去 ...
- mysql创建临时表 主键_MySQL中临时表的基本创建与使用教程
当工作在非常大的表上时,你可能偶尔需要运行很多查询获得一个大量数据的小的子集,不是对整个表运行这些查询,而是让MySQL每次找出所需的少数记录,将记录选择到一个临时表可能更快些,然后在这些表运行查询. ...
- mysql获取当前的月_MYSQL中获取当前的年和月
展开全部 select year(curdate()),month(curdate()),day(curdate()); select weekofyear(curdate()); 有点细微的差别,w ...
- mysql 导入数据库sql语句_mysql中导入数据与导出数据库sql语句
本文章来详细介绍关于mysql中导入数据与导出数据库sql语句,在mysql中常用的导入与导出数据的命令有source与mysqldump大家可参考. 1.例1:连接到本机上的MYSQL 首先在打开D ...
- mysql日期隐式转换_mysql中的隐式转换
什么隐式类型转换? 在MySQL中: 当操作符与不同类型的操作数一起使用时,会发生类型转换以使操作数兼容.则会发生转换隐式 也就是说,MySQL会根据需要自动将数字转换为字符串,将字符串转换数字.看到 ...
最新文章
- http方法_手撸HTTP是理解HTTP的最好方法(0)
- 自定义复制和新建的文件名
- windows nt service 框架
- C语言数组相似度比对,某课程设计---文件相似度判断
- android JNI(转)
- mysql中名词解析
- 机器人动力学与控制_机器人领域值得一看的好书推荐
- CAD插件学习系列教程（一） 贱人工具箱的使用
- 全开源！智能灯串开发资料全开源！为这个冬天装点烂漫“星空”
- 太赞了，英伟达又一突破，输入关键词就可以生成直逼摄影师的大片
- 管理部门使用计算机属于固定资产核算吗,固定资产核算管理内容
- 我的世界服务器修改器1.7.10,我的世界修改器_我的世界TMI内置修改器1.7.10 - 99单机游戏...
- Windows命令实现匿名邮件发送
- 门禁系统服务器 控制器 读卡器,门禁系统建设方案.docx
- AlertPay网银
- 一周搞定scrapy之第一天--爬取起点中文小说网
- uni-app 微信小程序提示音一闪而逝
- Android RxJava操作符的学习---功能性操作符--网络请求出错重连（结合Retrofit）
- 实验2-4-5 简单实现x的n次方(10分)
- java订单编号工具类_[idmiss-common] Java 工具类之- 顺序订单号的生成