- Install MySQL/MariaDB if it is not already installed
sudo apt install mariadb-server
- Log into OpenVPN Access Server
- Click Tools > DB Convert in the left navigation
- Enter the root MySQL password
- Click the DB Convert button
- Wait for the process to complete
- Click the Restart button
Further reading: https://openvpn.net/vpn-server-resources/configuration-database-management-and-backups/