How can I kill all MySQL sleeping queries?


I’ve noticed that I have a lot of sleeping MySQL processes. I tried killing them one by one but there are too many to do so. Does anyone know if there is an easier way to kill all sleeping processes at once?


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Accepted Answer


Yes, you can kill all of your sleeping connections with this command:

for i in `mysql -e "show processlist" | awk '/Sleep/ {print $1}'` ; do mysql -e "KILL $i;"; done

However, this is not a permanent solution. I would recommend having a look at your code and trying to figure out why those connections are kept open in the first place.

Hope that this helps! Regards, Bobby


Andrew Moore
DigitalOcean Employee
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October 16, 2019

@devdojo the config variable wait_timeout sets the amount of time that MySQL will wait before killing an idle connection.

The default wait_timeout variable is 28800 seconds, which is 8 hours, you can reduce this to fit your needs. It’s a dynamic variable so you can change this on the fly. If you do change this it will only be applicable to new connections not existing threads in Sleep state.

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