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Issue Constantly increasing Mysql memory usage problem

orcunaras

New Pleskian
Server operating system version
Ubuntu 22.04
Plesk version and microupdate number
18.0.69
I have 2 ubuntu servers over IONOS. One of them is 6 y.o and two of my wordpress sites use near 270 mb mysql memory.

But my new server alarmed 6 months ago and i discovered mysql memory usage increased over 7 GB. I reset it many times and check these:

*Php configuration
*Nginx conf.
*Php version and php.ini
*Ubuntu/Alma
*InnoDB conf
*migrated a good copy of site (from my old server) to my new server and increased same as old scenario.

What is wrong with me? There is one wordpress/wocoommerce site on 12vcpu 24gb server. I tested on 4vcpu 8 gb and it was same.
No matter what I do, even though memory seems to remain stable for 1-2 days, it reaches serious levels by the end of the week.

I decided to start everything from scratch, but who knows if this problem will not reoccur?

On my new server, behaviour
Screenshot 2025-03-05 at 12.25.22.png

On my old server, behaviour:
Screenshot 2025-05-12 at 13.34.26.png
 
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