Tom Lane wrote:
> Magnus Hagander <magnus@hagander.net> writes:
>> Specifically, I'm interested if I actually end up making my table any
>> smaller if I move from 64-bit integer primary key to 32-bit.
>
> Depends what else is in the row ... the overall row will get padded to
> MAXALIGN, but if you were wasting 4 bytes on alignment before, then you
> win.
Ah, I see. Followup: Does it make a measurable performance difference
for things like join or filtering operations, in case the storage size
ends up being the same?
//Magnus