Hello,
you can use mysqltuner to adapt MariaDB configuration for low resources usage :
# download mysqltuner
wget -qO /usr/local/bin/mysqltuner \
https://raw.githubusercontent.com/major/MySQLTuner-perl/master/mysqltuner.pl
# make it executable
chmod +x /usr/local/bin/mysqltuner
# run mysqltuner
mysqltuner