When are you truly forced to use UUID as part of the design?

Question

I don\'t really see the point of UUID. I know the probability of a collision is effectively nil, but effectively nil is not even close to impossible.

Answer 1

A classic example is when you are replicating between two databases.

DB(A) inserts a record with int ID 10 and at the same time DB(B) creates a a record with in ID 10. This is a collision.

With UUIDs this will not happen as they will not match. (almost certainly)