Re: Idea for getting rid of VACUUM FREEZE on cold pages

Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
> This sounds like extending Xid to 64 bits, without having to store the
> high bits everywhere.  Was this discussed in the PGCon devs meeting?

Yeah, that's what it would amount to.  It was not discussed at the dev
meeting --- it was an idea that came up one evening at PGCon.

I'm not sure whether this would imply having to widen xid to 64 bits
internally.  That could be a bit unpleasant as far as CPU and shared
memory space go, although every year that goes by makes 32-bit machines
less interesting as DB servers.
        regards, tom lane