批量 kill mysql 线程
时常有一些烂sql跑在数据库里，我们要进行kill，避免影响拖垮数据库。
mysql> show processlist;
+----+------+---------------------+--------------------+---------+------+----------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+---------------------+--------------------+---------+------+----------+------------------+
| 6 | root | 192.168.40.71:44018 | information_schema | Query | 0 | starting | show processlist |
+----+------+---------------------+--------------------+---------+------+----------+------------------+
1 row in set (0.00 sec)
mysql> select * from processlist;
+----+------+---------------------+--------------------+---------+------+-----------+---------------------------+
| ID | USER | HOST | DB | COMMAND | TIME | STATE | INFO |
+----+------+---------------------+--------------------+---------+------+-----------+---------------------------+
| 6 | root | 192.168.40.71:44018 | information_schema | Query | 0 | executing | select * from processlist |
+----+------+---------------------+--------------------+---------+------+-----------+---------------------------+
1 row in set (0.00 sec)
这两个命令本质是一样的。
所以只要找到你符合你条件的线程id就可以kill了。
mysql -uroot -S /tmp/mysql_20158.sock -sNe "select id from information_schema.processlist where COMMAND='Sleep' and TIME>60" | xargs -n 1 mysqladmin -uroot -S /tmp/mysql_20158.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=192.168.1.2 --user=root --password=000000 --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=192.168.1.2 --user=root --password=000000 --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=192.168.1.2 --user=root --password=000000 --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
