"variable performance schema is a read only variable"
After some googling, I got to the MariaDB documentation about Performance Schema, where it says:
"The performance schema cannot be activated at runtime - it must be set when the server starts by adding the following line in your my.cnf configuration file."
On linux I just used nano to edit the my.cnf file, typing:
nano /etc/my.cnf
I just added the "performance_schema=on" tag on the mysqld section, and saved the file. After that, a service restart should do the trick:
systemctl restart mariadb
Cheers!
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