How do you determine how far to normalize a database?

Question

When creating a database structure, what are good guidelines to follow or good ways to determine how far a database should be normalized? Should you create an un-normalized

Answer 1

I agree that it is typically better to start out with a normalized DB and then denormalize to solve very specific problems, but I'd probably start at Boyce-Codd Normal Form instead of 3rd Normal Form.