松散耦合的数据库设计 - 如何？

I'm implementing a web - based application using silverlight with an SQL Server DB on the back end for all the data that the application will display. I want to ensure that the application can be easily scalable and I feel the direction to go in with this is to make the database loosely coupled and not to tie everything up with foreign keys. I've tried searching for some examples but to no avail.I'm implementing a web - based application usin