RailsLab: Scaling Your Database – Part 1

In this screencast we take a look at the evolution of a database heavy Rails application. We learn how you might grow the app initially using vertical scaling and then move to horizontal scaling with Replication using the Masochism plugin. Lastly we cover a few other good uses of Replication such as fallback, backups, running reports/analytics, and background jobs.

http://railsenvy.com/2009/07/23/scaling-your-database