On Wed, Feb 5, 2014 at 12:50 AM, Heikki Linnakangas
<hlinnakangas@vmware.com> wrote:
>> I think there's zero overlap. They're completely complimentary features.
>> It's not like normal WAL records have an irrelevant volume.
>
>
> Correct. Compressing a full-page image happens on the first update after a
> checkpoint, and the diff between old and new tuple is not used in that case.
Uh, I really just meant that one thing that might overlap is
considerations around the choice of compression algorithm. I think
that there was some useful discussion of that on the other thread as
well.
--
Peter Geoghegan