Business Logic: Database or Application Layer

Question

The age old question. Where should you put your business logic, in the database as stored procedures ( or packages ), or in the application/middle tier? And more importantly

Answer 1

It's really up to you, as long as you're consistent.

One good reason to put it in your database layer: if you are fairly sure that your clients will never ever change their database back-end.

One good reason to put it in the application layer: if you are targeting multiple persistence technologies for your application.

You should also take into account core competencies. Are your developers mainly application layer developers, or are they primarily DBA-types?