Nice tip, I luckily haven't had that problem yet but I'll be sure to refer to this thread if my MySQL goes haywire!
Another thing that I think is worth mentioning is that if the database still uses a lot of memory after doing that then a possible reason might be that your website is having a heavy amount of traffic at that moment, at that point you might want to check if it's legit traffic or someone trying to crash your server.
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