PT kill of MySQL

Write it at the front

The role of database in business development is self-evident , And sometimes we get caught up in big things , Long time query, etc , Because these problems may lead to a significant decline in database processing capacity , This seriously affects the responsiveness of the application . Of course, we can use simple commands to deal with these problems , For example, use kill Kill the corresponding thread , But it's still more troublesome , At this point, we can consider using tools , and percona Of pt-kill It provides this ability , Let's take a look at how to use .

1： install

stay here Download source package , Then execute the following command to install ：

tar xvzf Data-Dumper-2.154.tar.gz
cd Data-Dumper-2.121
perl Makefile.PL
make
make install

Possible errors and solutions ：

 error ：Can’t locate ExtUtils/MakeMaker.pm in @INC
 Solution ：yum install perl-ExtUtils-MakeMaker

 error ：bash:gcc:command not found
 Solution ：yum install gcc

 error ：Can't locate Data/Dumper.pm in @INC
 Solution ：
    wget http://www.cpan.org/modules/by-module/Data/Data-Dumper-2.154.tar.gz
    chmod +x Data-Dumper-2.154.tar.gz
    tar xvzf Data-Dumper-2.154.tar.gz
    cd Data-Dumper-2.154
    perl Makefile.PL
    make
    make install

2： Command Introduction

pt-kill The command is mainly divided into the following four parts , Refer to screenshot ：

3： example

3.1： Kill execution time exceeded 20s The sentence of

The following simulation sql sentence ：

SELECT SLEEP(50000);

show processlist see ：

Carry out orders ：

[[email protected] Data-Dumper-2.154]# pt-kill --host=192.168.10.119 --port=3366 --user=root --password=root --match-command="Query" --busy-time 30 --victims all --interval 10 --print --kill --log=/tmp/1.log
# 2022-06-06T13:55:47 KILL 45 (Query 475 sec) select sleep(50000)

Others can be tested by parameter configuration .

Written in the back

Refer to the list of articles ：

Pt-kill How to use it | Meichuang operation and maintenance diary .