mysql几个timeout参数_MySQL中 timeout相关参数解析
前言：
MySQL中有兩個關于連接超時的配置項。他們之間在某些條件下會互相繼承，那究竟這兩個參數會在什么情況下起作用呢？
本文將會通過一些測試實例來證明總結兩者的相互關系。
參數介紹：
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.
簡單的說 interactive就是交互式的終端，例如在shell里面直接執行mysql，出現 mysql> 后就是交互式的連接。而mysql -e 'select 1' 這樣的直接返回結果的方式就是非交互式的連接。
第二部分 ?測試
2.1 繼承關系
Q：通過Socket連接 timeout會從哪個global timeout繼承
A：由下例可見，通過socket登錄，timeout 繼承于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：通過TCP/IP client 連接，?timeout會從哪個global timeout繼承
A：由下例可見，通過TCP/IP client 連接后的wait_timeout 仍然繼承于 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 起效關系
Q：timeout值，對于正在運行用的語句是否起效？
A：由下例可見SQL正在執行狀態的等待時間不計入timeout時間
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 會起效
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哪個起作用。
A：只有session timeout 會起作用。
測試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)
測試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 總結
由以上的階段測試可以獲得以下結論。
1. 超時時間只對非活動狀態的connection進行計算。
2. 超時時間指通過 session wait_timeout 起效。
3. 交互式連接的wait_timeout 繼承于 global.interactive_timeout
非交互式連接的wait_timeout 繼承于 global.wait_timeout
4. 繼承關系和超時對 TCP/IP 和 Socket 連接均有效果
總結
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