免费视频淫片aa毛片_日韩高清在线亚洲专区vr_日韩大片免费观看视频播放_亚洲欧美国产精品完整版

打開APP
userphoto
未登錄

開通VIP，暢享免費(fèi)電子書等14項(xiàng)超值服

開通VIP

首頁

好書

留言交流

下載APP

聯(lián)系客服
MySQL中 timeout相關(guān)參數(shù)解析

前言：

MySQL中有兩個(gè)關(guān)于連接超時(shí)的配置項(xiàng)。他們之間在某些條件下會(huì)互相繼承，那究竟這兩個(gè)參數(shù)會(huì)在什么情況下起作用呢？

本文將會(huì)通過一些測(cè)試實(shí)例來證明總結(jié)兩者的相互關(guān)系。

 

參數(shù)介紹：

 interactive_timeout

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 the CLIENT_INTERACTIVE option to mysql_real_connect(). See alsowait_timeout.

 

wait_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

Permit interactive_timeout seconds (instead of wait_timeout seconds) of inactivity before closing the connection. The client's sessionwait_timeout variable is set to the value of the session interactive_timeout variable.

簡(jiǎn)單的說 interactive就是交互式的終端，例如在shell里面直接執(zhí)行mysql，出現(xiàn) mysql> 后就是交互式的連接。而mysql -e 'select 1' 這樣的直接返回結(jié)果的方式就是非交互式的連接。

 

第二部分  測(cè)試 

2.1 繼承關(guān)系 

Q：通過Socket連接 timeout會(huì)從哪個(gè)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, 0 rows affected (0.00 sec)
mysql> set global wait_timeout = 22222;
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like '%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    |
+----------------------------+----------+
10 rows in set (0.00 sec)
mysql -uroot -ppassword <span style="color: #000000;">-S /usr/local/mysql3310/mysql.sock</span>
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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 session variables like '%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    |
+----------------------------+----------+
10 rows in set (0.00 sec)

　　

Q：通過TCP/IP client 連接， timeout會(huì)從哪個(gè)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
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 6
Server version: 5.5.16-log MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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 session variables like '%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    |
+----------------------------+----------+
10 rows in set (0.00 sec)

　　

2.2 起效關(guān)系

Q：timeout值，對(duì)于正在運(yùn)行用的語句是否起效？

A：由下例可見SQL正在執(zhí)行狀態(tài)的等待時(shí)間不計(jì)入timeout時(shí)間

mysql> set session wait_timeout=10;
Query OK, 0 rows affected (0.00 sec)
mysql> set session interactive_timeout=10;
Query OK, 0 rows affected (0.00 sec)
mysql> select 1,sleep(20) from dual;
+---+-----------+
| 1 | sleep(20) |
+---+-----------+
| 1 |         0 |
+---+-----------+
1 row in set (20.00 sec)
mysql>
mysql> show session variables like '%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(huì)起效

mysql> set session interactive_timeout=10;
Query OK, 0 rows affected (0.00 sec)
mysql> set session wait_timeout=20;
Query OK, 0 rows affected (0.00 sec)
---------------------another connection-------------------------
mysql> show full processlist;
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id | User        | Host            | db   | Command | Time   | State                                                                       | Info                  | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
|  1 | system user |                 | NULL | Connect | 103749 | Slave has read all relay log; waiting for the slave I/O thread to update it | NULL                  |         0 |             0 |         1 |
|  2 | system user |                 | NULL | Connect | 103750 | Connecting to master                                                        | NULL                  |         0 |             0 |         1 |
|  3 | root        | localhost       | NULL | Query   |      0 | NULL                                                                        | show full processlist |         0 |             0 |        11 |
| 10 | root        | localhost:58946 | NULL | Sleep   |     20 |                                                                             | NULL                  |         0 |             0 |        11 |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
4 rows in set (0.00 sec)
mysql> show full processlist;
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id | User        | Host      | db   | Command | Time   | State                                                                       | Info                  | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
|  1 | system user |           | NULL | Connect | 103749 | Slave has read all relay log; waiting for the slave I/O thread to update it | NULL                  |         0 |             0 |         1 |
|  2 | system user |           | NULL | Connect | 103750 | Connecting to master                                                        | NULL                  |         0 |             0 |         1 |
|  3 | root        | localhost | NULL | Query   |      0 | NULL                                                                        | show full processlist |         0 |             0 |        11 |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
3 rows in set (0.00 sec)

　　

Q：global timeout和session timeout哪個(gè)起作用。

A：只有session timeout 會(huì)起作用。 

測(cè)試1：

mysql> set session interactive_timeout = 10;
Query OK, 0 rows affected (0.00 sec)
mysql> set session wait_timeout = 10;
Query OK, 0 rows affected (0.00 sec)
mysql> show session variables like '%timeout%';
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| interactive_timeout        | 10       |
| wait_timeout               | 10       |
+----------------------------+----------+
10 rows in set (0.00 sec)
mysql> show global variables like '%timeout%';
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| interactive_timeout        | 20       |
| wait_timeout               | 20       |
+----------------------------+----------+
10 rows in set (0.00 sec)
mysql> show full processlist;
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id | User        | Host            | db   | Command | Time   | State                                                                       | Info                  | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
|  3 | root        | localhost       | NULL | Query   |      0 | NULL                                                                        | show full processlist |         0 |             0 |        11 |
| 17 | root        | localhost:60585 |<span style="color: #000000;"> NULL | Sleep   |     10 |   </span>                                                                          | NULL                  |        10 |            10 |        11 |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
2 rows in set (0.00 sec)
mysql> show full processlist;
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id | User        | Host      | db   | Command | Time   | State                                                                       | Info                  | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
|  3 | root        | localhost | NULL | Query   |      0 | NULL                                                                        | show full processlist |         0 |             0 |        11 |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
1 rows in set (0.00 sec)

 測(cè)試2：

mysql> show session variables like '%timeout%';
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| interactive_timeout        | 20       |
| wait_timeout               | 20       |
+----------------------------+----------+
10 rows in set (0.00 sec)
mysql> show global variables like '%timeout%';
+----------------------------+----------+
| Variable_name              | Value    |
+----------------------------+----------+
| interactive_timeout        | 10       |<br>| wait_timeout               | 10       |
+----------------------------+----------+
10 rows in set (0.00 sec)
mysql> show full processlist;
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id | User        | Host            | db   | Command | Time   | State                                                                       | Info                  | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
|  3 | root        | localhost       | NULL | Query   |      0 | NULL                                                                        | show full processlist |         0 |             0 |        11 |
| 19 | root        | localhost:50276 | NULL | Sleep   |     19 |                                                                             | NULL                  |        10 |            10 |        11 |
+----+-------------+-----------------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
2 rows in set (0.00 sec)
mysql> show full processlist;
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
| Id | User        | Host      | db   | Command | Time   | State                                                                       | Info                  | Rows_sent | Rows_examined | Rows_read |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
|  3 | root        | localhost | NULL | Query   |      0 | NULL                                                                        | show full processlist |         0 |             0 |        11 |
+----+-------------+-----------+------+---------+--------+-----------------------------------------------------------------------------+-----------------------+-----------+---------------+-----------+
1 rows in set (0.00 sec)

　　

第三部分 總結(jié)

由以上的階段測(cè)試可以獲得以下結(jié)論。

1. 超時(shí)時(shí)間只對(duì)非活動(dòng)狀態(tài)的connection進(jìn)行計(jì)算。

2. 超時(shí)時(shí)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(guān)系和超時(shí)對(duì) TCP/IP 和 Socket 連接均有效果

本站僅提供存儲(chǔ)服務(wù)，所有內(nèi)容均由用戶發(fā)布，如發(fā)現(xiàn)有害或侵權(quán)內(nèi)容，請(qǐng)點(diǎn)擊舉報(bào)。
打開APP，閱讀全文并永久保存 查看更多類似文章
猜你喜歡
類似文章
SQL查詢超時(shí)的設(shè)置方法
MySQL 事務(wù)沒有提交導(dǎo)致 鎖等待 Lock wait timeout exceeded
mysql出現(xiàn)大量sleep進(jìn)程的原因與解決方案
MySQL如何找出未提交事務(wù)的SQL淺析
怎樣把壞的MySQL查詢找到并殺死？
MySQL鎖：01.總覽
更多類似文章 >>
生活服務(wù)
分享 收藏 導(dǎo)長(zhǎng)圖 關(guān)注 下載文章
綁定賬號(hào)成功
后續(xù)可登錄賬號(hào)暢享VIP特權(quán)！
如果VIP功能使用有故障，
可點(diǎn)擊這里聯(lián)系客服！

聯(lián)系客服