We use MariaDB on our Shared, Cloud, and WordPress hosting packages.
MariaDB includes the same basic functionality as MySQL, while adding important improvements, such as a query optimizer.
It also gets updated regularly, and its overall performance is much better compared to MySQL.
NOTES:
In case you are using MySQL and want to know if your database will be compatible, check this documentation: MariaDB versus MySQL: Compatibility
In case you need to use a different type of SQL, you can consider purchasing a VPS plan