MySQL partition is full
MySQL databases are located on /var/lib/mysql, if you create a partition for /var and and big enough to hold your databases MySQL will stop working because not enough space to put the data. Below is the easy way to fix it:
Assume you have /home partition which is far more bigger than /var, we’ll move to /home/mysql
service mysql stop
cd /var/lib
mv mysql /home
ln -s /home/mysql .
chown -R mysql.mysql mysql
service mysql start
The lesson in here is: please do research how much your data will grow, or it will be pain in the ass

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