Eric Ridge <ebr@tcdi.com> writes:
> wow. I should go back and read the archives to see if this was
> discussed already, but I can't help but wonder if there's a way to only
> copy pointers to the tuples. I realize VACUUM could screw it up, but
> maybe something could be invented (or re-used) to help guard against
> that.
Still looking for that free lunch, eh?
If you want to leave the tuples on-disk, then you hold a transaction
open to ensure that VACUUM won't whisk them out from under you. That's
what the normal non-HOLD cursor case will do.
If you don't want to leave the tuples on-disk, you have to copy them
someplace. You can do that with a HOLD cursor.
AFAICS any other solution will simply reinvent one or the other of these
techniques.
regards, tom lane
