Default primary key should (must ;) ) be INT instead of GUID

Jul 2, 2014 at 5:29 PM
Default primary key should be INT instead of GUID. Using GUID may not be a practical option in many real world applications. Storage and performance will become an immediate issue very quickly even in a medium sized application.

Many applications refer to this userid in many parts of the application such as created by, modified by, approved by, removed by etc.

Unless I am missing something, what is the motivation of making it guid to begin with?