title: What databases should I use with Ruby on Rails, based on current Hosting services?
body: <p>I've been looking for hosting services and I still don't know what kind of database is the most commom. It seems to be MySql and PostgreSql. 
  So, I'm not sure about how much traffic and data my website will have (it's just a project), but I would like to be prepared. I've worked in some projects with Oracle (PL/SQL) and I know something from MySql.  </p>
  
  <p>Thank you !</p>
  
  <p>ps. 4 years later, I've been coding RoR mostly with PostgreSQL. SQLite by default when I need simple apps, but PostgreSQL otherwise. </p>