Before I proceed further, let's exactly define what business logic is. While presenting this at conferences and to companies I have become aware of the fact that not everyone agrees to what business logic actually is, and in many cases it's not even been well thought out what business logic is and what it is not.
The database server is a storage layer. Databases are designed to store, retrieve, and update data as quickly and efficiently as possible. This functionality is often referred to as CRUD (Create, Retrieve, Update, Delete). Certainly some databases are CRUD, but that is another topic.
Databases are designed to be very fast and efficient with CRUD operations. They are not designed to format telephone numbers, calculate optimum usage and peak periods of utility usage, determine geographic destinations and routings of shipments, and so on. Yet, I have seen all of these cases, and even more complex ones implemented mostly or even wholly inside stored procedures.
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