Home Database Mysql Tutorial MYSQL锁表问题的解决方法_MySQL

MYSQL锁表问题的解决方法_MySQL

May 27, 2016 pm 01:45 PM

本文实例讲述了MYSQL锁表问题的解决方法。分享给大家供大家参考,具体如下:

很多时候!一不小心就锁表!这里讲解决锁表终极方法!

案例一


1

mysql>show processlist;

Copy after login


参看sql语句

一般少的话


1

mysql>kill thread_id;

Copy after login


就可以解决了

kill掉第一个锁表的进程, 依然没有改善. 既然不改善, 咱们就想办法将所有锁表的进程kill掉吧, 简单的脚本如下.


1

2

3

4

5

6

#!/bin/bash

mysql - u root - e " show processlist " | grep - i " Locked " >> locked_log . txt

for line in ` cat locked_log.txt | awk '{print $1 }' `

do

echo " kill $line ; " >> kill_thread_id . sql

done

Copy after login


现在kill_thread_id.sql的内容像这个样子


1

2

3

4

5

kill 66402982 ;

kill 66402983 ;

kill 66402986 ;

kill 66402991 ;

.....

Copy after login


好了, 我们在mysql的shell中执行, 就可以把所有锁表的进程杀死了.


1

mysql > source kill_thread_id . sql

Copy after login


当然了, 也可以一行搞定


1

2

3

4

for id in `mysqladmin processlist | grep -i locked | awk '{print $1}'`

do

mysqladmin kill ${id}

done

Copy after login


案例二

如果大批量的操作能够通过一系列的select语句产生,那么理论上就能对这些结果批量处理。

但是mysql并没用提供eval这样的对结果集进行分析操作的功能。所以只能现将select结果保存到临时文件中,然后再执行临时文件中的指令。

具体过程如下:


1

2

3

4

5

6

7

8

9

10

11

12

13

mysql> SELECT concat('KILL ',id,';') FROM information_schema.processlist WHERE user='root';

+------------------------+

| concat('KILL ',id,';')

+------------------------+

| KILL 3101;     

| KILL 2946;     

+------------------------+

2 rows IN SET (0.00 sec)

mysql> SELECT concat('KILL ',id,';') FROM information_schema.processlist WHERE user='root'

INTO OUTFILE '/tmp/a.txt';

Query OK, 2 rows affected (0.00 sec)

mysql> source /tmp/a.txt;

Query OK, 0 rows affected (0.00 sec)

Copy after login


案例三

MySQL + PHP的模式在大并发压力下经常会导致MySQL中存在大量僵死进程,导致服务挂死。为了自动干掉这些进程,弄了个脚本,放在服务器后台通过crontab自动执行。发现这样做了以后,的确很好的缓解了这个问题。把这个脚本发出来和大家Share.

根据自己的实际需要,做了一些修改:

SHELL脚本:mysqld_kill_sleep.sh


1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

#!/bin/sh

mysql_pwd="root的密码"

mysqladmin_exec="/usr/local/bin/mysqladmin"

mysql_exec="/usr/local/bin/mysql"

mysql_timeout_dir="/tmp"

mysql_timeout_log="$mysql_timeout_dir/mysql_timeout.log"

mysql_kill_timeout_sh="$mysql_timeout_dir/mysql_kill_timeout.sh"

mysql_kill_timeout_log="$mysql_timeout_dir/mysql_kill_timeout.log"

$mysqladmin_exec -uroot -p"

$mysql_pwd" processlist | awk '{ print $12 , $2 ,$4}' | grep -v Time | grep -v '|' | sort -rn >

$mysql_timeout_log

awk '{if($1>30 && $3!="root") print "'""$mysql_exec""' -e " "\"" "kill",$2 "\"" " -uroot " "-p""\"""'""$

mysql_pwd""'""\"" ";" }' $mysql_timeout_log > $mysql_kill_timeout_sh

echo "check start ...." >> $mysql_kill_timeout_log

echo `date` >> $mysql_kill_timeout_log

cat $mysql_kill_timeout_sh

Copy after login


把这个写到mysqld_kill_sleep.sh。然后chmod 0 mysqld_kill_sleep.sh,chmod u+rx mysqld_kill_sleep.sh,然后用root账户到cron里面运行即可,时间自己调整。

执行之后显示:


1

2

3

4

5

6

7

8

9

10

11

12

www# ./mysqld_kill_sleep.sh

/usr/local/bin/mysql -e "kill 27549" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27750" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27840" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27867" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27899" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27901" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27758" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27875" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27697" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27888" -uroot -p"mysql root的密码";

/usr/local/bin/mysql -e "kill 27861" -uroot -p"mysql root的密码";

Copy after login


如果确认没有问题了,把最后的cat修改为sh即可。

本人改写了下上面的脚本:


1

2

3

4

5

6

7

8

9

10

11

12

13

14

#!/bin/bash

mysql_pwd="密码"

mysql_exec="/usr/local/mysql/bin/mysql"

mysql_timeout_dir="/tmp"

mysql_kill_timeout_sh="$mysql_timeout_dir/mysql_kill_timeout.sh"

mysql_kill_timeout_log="$mysql_timeout_dir/mysql_kill_timeout.log"

$mysql_exec -uroot -p$mysql_pwd -e "show processlist" | grep -i "Locked" >> $mysql_kill_timeout_log

chmod 777 $mysql_kill_timeout_log

for line in `$mysql_kill_timeout_log | awk '{print $1}'`

do

echo "$mysql_exec -uroot -p$mysql_pwd -e \"kill $line\"" >> $mysql_kill_timeout_sh

done

chmod 777 $mysql_kill_timeout_sh

cat $mysql_kill_timeout_sh

Copy after login


 以上就是MYSQL锁表问题的解决方法_MySQL的内容,更多相关内容请关注PHP中文网(www.php.cn)!


Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Roblox: Bubble Gum Simulator Infinity - How To Get And Use Royal Keys
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
Nordhold: Fusion System, Explained
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
Mandragora: Whispers Of The Witch Tree - How To Unlock The Grappling Hook
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1677
14
PHP Tutorial
1280
29
C# Tutorial
1257
24
Laravel Introduction Example Laravel Introduction Example Apr 18, 2025 pm 12:45 PM

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

MySQL and phpMyAdmin: Core Features and Functions MySQL and phpMyAdmin: Core Features and Functions Apr 22, 2025 am 12:12 AM

MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.

MySQL vs. Other Programming Languages: A Comparison MySQL vs. Other Programming Languages: A Comparison Apr 19, 2025 am 12:22 AM

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages ​​such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages ​​have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

Laravel framework installation method Laravel framework installation method Apr 18, 2025 pm 12:54 PM

Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.

Explain the purpose of foreign keys in MySQL. Explain the purpose of foreign keys in MySQL. Apr 25, 2025 am 12:17 AM

In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.

Compare and contrast MySQL and MariaDB. Compare and contrast MySQL and MariaDB. Apr 26, 2025 am 12:08 AM

The main difference between MySQL and MariaDB is performance, functionality and license: 1. MySQL is developed by Oracle, and MariaDB is its fork. 2. MariaDB may perform better in high load environments. 3.MariaDB provides more storage engines and functions. 4.MySQL adopts a dual license, and MariaDB is completely open source. The existing infrastructure, performance requirements, functional requirements and license costs should be taken into account when choosing.

What software is better for yi framework? Recommended software for yi framework What software is better for yi framework? Recommended software for yi framework Apr 18, 2025 pm 11:03 PM

Abstract of the first paragraph of the article: When choosing software to develop Yi framework applications, multiple factors need to be considered. While native mobile application development tools such as XCode and Android Studio can provide strong control and flexibility, cross-platform frameworks such as React Native and Flutter are becoming increasingly popular with the benefits of being able to deploy to multiple platforms at once. For developers new to mobile development, low-code or no-code platforms such as AppSheet and Glide can quickly and easily build applications. Additionally, cloud service providers such as AWS Amplify and Firebase provide comprehensive tools

SQL vs. MySQL: Clarifying the Relationship Between the Two SQL vs. MySQL: Clarifying the Relationship Between the Two Apr 24, 2025 am 12:02 AM

SQL is a standard language for managing relational databases, while MySQL is a database management system that uses SQL. SQL defines ways to interact with a database, including CRUD operations, while MySQL implements the SQL standard and provides additional features such as stored procedures and triggers.

See all articles