How to migrate to a larger database

I am fairly new to Ruby on Rails but am starting to do more development in that area. My q开发者_开发知识库uestion is, if I build a simple application that only has about 20 users and a couple thousand rows worth of content and then that number explodes to the point where I need to move to another database how does this work in RoR? What I am really looking for is a description of the process.

Rails is database agnostic. So worry not, you can very easily switch if you ever need to :) (that is if you do not write lots of native queries of course)