批量清理mysql进程

批量kill掉无用的sql语句，避免影响拖垮数据库。

MariaDB [(none)]> show processlist;
+--------+------+-----------------+----------+---------+------+-------+------------------+----------+
| Id     | User | Host            | db       | Command | Time | State | Info             | Progress |
+--------+------+-----------------+----------+---------+------+-------+------------------+----------+
| 103258 | root | localhost:57884 | adminset | Sleep   |    2 |       | NULL             |    0.000 |
| 103259 | root | localhost       | NULL     | Query   |    0 | NULL  | show processlist |    0.000 |
+--------+------+-----------------+----------+---------+------+-------+------------------+----------+
2 rows in set (0.00 sec)

MariaDB [(none)]> show full processlist;
+--------+------+-----------------+----------+---------+------+-------+-----------------------+----------+
| Id     | User | Host            | db       | Command | Time | State | Info                  | Progress |
+--------+------+-----------------+----------+---------+------+-------+-----------------------+----------+
| 103258 | root | localhost:57884 | adminset | Sleep   |    3 |       | NULL                  |    0.000 |
| 103259 | root | localhost       | NULL     | Query   |    0 | NULL  | show full processlist |    0.000 |
+--------+------+-----------------+----------+---------+------+-------+-----------------------+----------+
2 rows in set (0.00 sec)

找到你符合你条件的线程id就可以kill了

mysql -uroot -S /var/lib/mysql/mysql.sock -sNe "select id from information_schema.processlist where COMMAND='Sleep' and TIME>60" | xargs -n 1 mysqladmin -uroot -S /var/lib/mysql/mysql.sock kill

或者生成kill 命令，再自己手动执行：

select concat('KILL ',id,';') from information_schema.processlist where COMMAND='Sleep' and TIME>60;

或者用工具mt-kill pt-kill

pt-kill --host=192.168.0.1 --user=root --password=mypwd --port=3306 --busy-time 60 --match-command="query|Execute" --victim all --interval 1 --kill --daemonize --pid=/tmp/ptkill.pid --print --log=/home/pt-kill.log

pt-kill --host=192.168.0.1 --user=root --password=mypwd --port=3306 --busy-time 60 --match-state="Locked|Sending data" --victim all --interval 1 --kill --daemonize --pid=/tmp/ptkill.pid --print --log=/home/pt-kill.log

pt-kill --host=192.168.0.1 --user=root --password=mypwd --port=3306 --busy-time 60 --match-info="SELECT|DELETE" --victim all --interval 1 --kill --daemonize --pid=/tmp/ptkill.pid --print --log=/home/pt-kill.log

还可以用如下脚本

#!/bin/bash
#批量kill mysql进程的时候条件要尽可能的严格，最好是过滤掉包括update和insert的进程
#kill掉test用户的mysql进程
#for i in `mysql -uroot -pmypwd -se "show processlist" | grep -v "show processlist" | awk '{if($2=="test") print $1}'`
#kill掉来自172.16.13.177的主机的mysql进程
#for i in `mysql -uroot -pmypwd -se "show processlist" | grep -v "show processlist" | awk '{if($3 ~/^172.16.13.177:*/) print $1}'`
#kill掉执行时间大于15秒的mysql进程
#for i in `mysql -uroot -pmypwd -se "show processlist" | grep -v "show processlist" | awk '{if($6 > 15) print $1}'`
#kill掉执行所有的不包括update和insert关键词的mysql进程
#for i in `mysql -uroot -pmypwd -se "show full processlist" | grep -v "show full processlist"|grep -vi -E "update|insert"|awk '{print $1}'`
do
#mysql -uroot -pmypwd -e "kill $i"
echo $i
done