[taligent]

Simple. To add a new attribute with MongoDB I simply add a new variable in my Java model and that's it. Done.

With RDBMS. I have to write an update SQL script, rollback SQL script, run it against my dev environment, ensure it is applied through test environments and hope the DBA doesn't forgot to run it in production (it happens).

[wahnfrieden]

I use an RDBMS with Django. When I want to add a new attribute to a schema, I just add the variable to my model, and South picks up on the change and writes the update script for me.