MySQL中 timeout相关参数解析
来源:互联网 发布:plc步进电机编程实例 编辑:程序博客网 时间:2024/03/29 22:37
转自:http://www.cnblogs.com/cenalulu/archive/2012/06/20/2554863.html
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:
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_INTERACTIVE
connect 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.
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, 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
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, 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 会起效
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哪个起作用。
A:只有session timeout 会起作用。
测试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)
测试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 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中 timeout相关参数解析
- MySQL timeout相关参数解析和测试
- mysql中timeout参数的相关解释
- MySQL连接相关的timeout参数解读
- MySQL的timeout相关配置参数小结一把
- MySQL的timeout相关配置参数小结一把
- MySQL Timeout解析
- MySQL Timeout解析
- MySQL Timeout解析
- MySQL Timeout解析
- MySQL Timeout解析
- MySQL的timeout参数说明
- mysql timeout参数详解1
- mysql timeout参数详解2
- mysql和连接相关的timeout
- mysql和连接相关的timeout
- MySQL 4个timeout参数说明
- MySQL几个超时参数(timeout)解释
- Unity3d场景加载进度条
- c++程序的内存格局
- mysql wait_timeout和interactive_timeout总结
- malloc和new有什么区别
- 图像处理与计算机视觉:基础,经典以及最近发展(2)图像处理与计算机视觉相关的书籍
- MySQL中 timeout相关参数解析
- UIPageControl 的圆点颜色的改变
- sizeof和strlen的区别
- jdbc启动错误(The driver has not received any packets from the server)
- 学习笔记:x86架构下观察 torn-read
- 结构体字节对齐
- 2014年工作中用到的命令
- 发布MFC程序
- 软考之数据结构