Re: 64-bit CommandIds

Tom Lane wrote:
> Bruce Momjian <bruce@momjian.us> writes:
> > So, is this an option we want for configure?
>
> I think the case for it got a whole lot weaker in 8.3, with lazy
> consumption of CIDs.  If someone had tables big enough to make the
> 32-bit-CID limit still be a problem despite that fix, I'd think they'd
> not be very happy about adding another 4 bytes of tuple header overhead
> (or more likely 8 bytes, on the kind of machine where this patch would
> make some sense).  I don't foresee many people paying that cost rather
> than breaking up their transactions.
>
> My feeling is we should avoid the extra complexity, at least till such
> time as we see whether there are still any real field complaints about
> this with 8.3.
>
> In any case the patch is broken by --enable-float8-byval, and would
> need some adjustments to play nice with that.

Agreed.  Let's see if we get requests for it in >= 8.3 releases.

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +