Upper limit for autoincrement primary key in SQL Server

Question

What is the upper limit for an autoincrement primary key in SQL Server? What happens when an SQL Server autoincrement primary key reaches its upper limit?

Answer 1

It depends on the datatype. If you use bigint, you're unlikely to ever overflow. Even a normal int gives you a couple billion rows. I've never overflowed, so I can't tell you what happens if you do.