Open file in nano (or other text editor) from root user:
nano /etc/systemd/system/multi-user.target.wants/mariadb.service
Change parameters in file:
# Restart crashed server only, on-failure would also restart, for example, when # my.cnf contains unknown option Restart=always RestartSec=45s
Restart daemons:
systemctl daemon-reload systemctl restart mariadb.service