Cedric Leong <cedricleong(at)gmail(dot)com> writes:
> Just in case someone is interested enough to answer this. Does anyone know
> if the performance for a date column vs a timestamp column as a partition
> key is large?
I doubt it's even measurable, at least on 64-bit machines. You're
basically talking about 32-bit integer comparisons vs 64-bit integer
comparisons.
On a 32-bit machine it's possible that an index on a date column
will be physically smaller, so you could get some wins from reduced
I/O. But on (most?) 64-bit machines that difference goes away too,
because of alignment restrictions.
As always, YMMV; it never hurts to do your own testing.
regards, tom lane