Couchdb lets you listen to changes[1], if you want to do anything in addition to the basic CRUD you can do it there. This does limit you to performing asynchron

Couchdb lets you listen to changes[1], if you want to do anything in addition to the basic CRUD you can do it there. This does limit you to performing asynchronous operations but most of the time that's good enough. You do still end up with a scaling issue but because the users aren't hitting that part of your system directly it's easier to spread the load over time. [1] http://guide.couchdb.org/draft/notifications.html http://guide.couchdb.org/draft/notifications.html