Shell Script to auto kill mysql sleep processes

问题:

How We Kill mysql sleep processes Like:

+------+-----------+-----------+------------------------+---------+------+----------------+-------------------------------------------------------------------------------------------+
| Id   | User      | Host      | db                     | Command | Time | State          | Info                                                                                      |
+------+-----------+-----------+------------------------+---------+------+----------------+-------------------------------------------------------------------------------------------+
| 2477 | stageuser | localhost | jj_production_11102013 | Query   |    0 | end            | SELECT * FROM wp_comments WHERE blog_id = 1071 ORDER BY comment_date_gmt DESC LIMIT 0, 50 |
| 3050 | stageuser | localhost | jj_production_11102013 | Query   |    0 | Sorting result | SELECT * FROM wp_comments WHERE blog_id = 1071 ORDER BY comment_date_gmt DESC LIMIT 0, 50 |
| 3052 | stageuser | localhost | jj_production_11102013 | Sleep   |  336 |                | NULL                                                                                      |
| 3056 | stageuser | localhost | NULL                   | Query   |    0 | NULL           | show processlist                                                                          |
| 3057 | stageuser | localhost | jj_production_11102013 | Sleep   |  301 |                | NULL                                                                                      |
| 3058 | stageuser | localhost | jj_production_11102013 | Sleep   |  299 |                | NULL                                                                                      |
| 3059 | stageuser | localhost | jj_production_11102013 | Sleep   |  298 |                | NULL                                                                                      |
| 3061 | stageuser | localhost | jj_production_11102013 | Sleep   |  273 |                | NULL                                                                                      |
| 3068 | stageuser | localhost | jj_production_11102013 | Sleep   |  251 |                | NULL                                                                                      |
| 3072 | stageuser | localhost | jj_production_11102013 | Sleep   |  233 |                | NULL                                                                                      |
| 3111 | stageuser | localhost | jj_production_11102013 | Sleep   |    1 |                | NULL                                                                                      |
+------+-----------+-----------+------------------------+---------+------+----------------+-------------------------------------------------------------------------------------------+
11 rows in set (0.00 sec)

Is this sleep processes affect site performance like slow other queries?

回答1:

I made it.

Create kill_sleep.sh file

mysql -u<user> -p<password> -h<host> -e "select concat('KILL ',id,';')  into outfile '/tmp/sleep_processes.txt' from information_schema.processlist where Command = 'Sleep'"
mysql -u<user> -p<password> -h<host> -e "source /tmp/sleep_processes.txt;"
rm -rf /tmp/sleep_processes.txt

And set kill_sleep.sh to cron job .

回答2:

Vishal's answer works well if you're running the command on the MySQL server, but it won't work if you're connecting to the server remotely or if you don't have permission to run SOURCE or SELECT ... INTO OUTFILE (eg. Amazon's RDS). It's possible to rewrite it not to rely on those features though, and then it'll work anywhere:

mysql -h<host> -u<user> -p -e "SELECT CONCAT('KILL ',id,';') FROM information_schema.processlist WHERE Command = 'Sleep'" > sleep.txt
cat sleep.txt | xargs -I% mysql -h<host> -u<user> -p -e "%"

回答3:

The syntax is:

KILL thread_id

In your case:

  mysql > KILL 3057

But in order to delete all the sleep processes,one command cant be used, you need to loop through whole processlist,after taking all the processes in tmp table and looping through it:

select concat('KILL ',id,';') from information_schema.processlist where Command='Sleep';

select concat('KILL ',id,';') from information_schema.processlist where Command='Sleep' into outfile '/tmp/a.txt';

Referred from here

回答4:

Percona Tools:

pt-kill --match-command Sleep --idle-time 100 --victims all  --interval 30 --kill

This will find all connections that are "Sleep" state and idle for 100 seconds or more and kill them. --interval 30 will make it keep do this every 30 seconds. So you can open a screen -S ptkill then in that screen run the above command, then ctrl-A, D to detach and exit the terminal and it will just keep running cleaning up your connections.

https://www.percona.com/doc/percona-toolkit/2.1/pt-kill.html