Question

While designing applications it is a very good practice to have all the business logic in one place. So why then we sometimes have the business logic in stored procs? Can we fetch all data from the DB and store it in a DataSet and then process it? What would be the performance of the app in this scenario?

Answer 1

So why then we sometimes have the business logic in stored procs?

because sometime you need to do some processing before returning the data to the client, it would be wasteful to return a bunch of rows when you only need a subset. Some complex things are also easier to do in a stored proc when you have to involve temp tables or linked servers for example