Question Default MySQL(MariaDB) Recomendations

[Nilton Santos]

Hi,

I have questions about how to use Mysql(MariaDB) default Plesk database.

I'm using the Plesk 12.5 and i know that no recommended to use Websites and databases on the same Operational System, then:
When i need have a database server in another Operational System?
What's the recommendations to use the database default Mysql of Plesk?
Why the Plesk use the old version 5.5.52 of MariaDB?

Tanks