On Tuesday, October 16, 2012 02:58:11 PM Andrew Dunstan wrote:
> On 10/16/2012 08:54 AM, Peter Eisentraut wrote:
> > Option 4 is of course to use UUIDs.
>
> Yeah, I was wondering what this would really solve that using UUIDs
> wouldn't solve.
Large indexes over random values perform notably worse than mostly/completely
ordered ones as they can be perfectly packed. Beside the fact that uuids have
2/4 times the storage overhead of int4/int8.
That has influences both in query and modification performance.
Also, not allowing plainly numeric pk's makes porting an application pretty
annoying...
Greetings,
Andres
-- Andres Freund http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services
