Re: What will happen if primary key value exceeds range Programming Databases by fahien i think you are right for small scale. but suppose we have 1000 contact on average for each individual. 2^32-1 = 4294967295. now dividing it by 1000 we get 4294967. which means that by this way we will be able to store contatcs of only 4294967 people. now does it seem practical to you?