How can I host my Ruby on Rails application - no hosting providers offer SQLite3 database

I'm really new at Ruby on Rails development. I'm reading Head First Rails and it says that Rails uses SQLite3开发者_如何转开发 as its database system.

How exactly would I go about uploading my website/application so the world can use it?

Rails uses sqlite3 by default, though you can edit your database.yml file to use a different adaptor (mysql, postgres, etc.) if you'd like. It's not recommended to deploy to production using sqlite3 as your database due to performance issues, though small apps would be ok.