# Install MariaDB 10.3
yum install rh-mariadb103-mariadb-server rh-mariadb103-mariadb-server-utils -y
# Add MariaDB 10.3 to $PATH
scl enable rh-mariadb103 bash
source /opt/rh/rh-mariadb103/enable
# start 10.3 server
chown -R mysql:mysql /var/opt/rh/rh-mariadb103/lib/mysql
;
systemctl start rh-mariadb103-mariadb
# Upgrade tables
mysql_upgrade -p
[PASSWORD]# Set 10.3 to start on boot
systemctl enable rh-mariadb103-mariadb
# Add 10.3 to paths on reboot (and remove 10.2)
rm /etc/profile.d/rh-mariadb102.sh
cp /opt/rh/rh-mariadb103/enable /etc/profile.d/rh-mariadb103.sh
# increase max connections number
systemctl edit rh-mariadb103-mariadb
[Service]LimitNOFILE=65535
LimitNPROC=65535
vi /etc/opt/rh/rh-mariadb103/my.cnf
[mysqld]max_connections=1000
open_files_limit=65535
# restart mariadb103
systemctl daemon-reload
systemctl restart rh-mariadb103-mariadb
# check result
mysql -e 'show variables like "max_connections"'
https://www.server-world.info/en/note?os=CentOS_7&p=mariadb103&f=4