The foundation of every Line of Business Application is the data store, typically a relational database.
With a proper database design, you can build a high performance, flexible application that is easy to support and update.
Done wrong, this tier of your infrastructure costs you over and over and over again.
We've helped our clients develop data storage infrastructure in support of tens of thousands of users. And we've done it in support of 2. If there's one thing that we've learned, it's that everyone either does things the right way, or wishes that they did.