Heroku lets you use ClearDB which is a MySQL clone - 100% compatible with MySQL.
As far as the underlying OS goes, it is Linux - but that shouldn't matter to you since your interaction with the servers your application is running on will be limited.
As far as the underlying OS goes, it is Linux - but that shouldn't matter to you since your interaction with the servers your application is running on will be limited.
I know this sounds silly, but where would I even start if I wanted to move my site over to heroku?