>> So a relation can't have some pages in Version 9.2, and other pages in
>> version 9.3? How will this work for 2TB tables?
>
> Not very well, but better than Tom's proposal to require upgrading the
> entire cluster in a single off-line operation.
Yes, but the result will be that anyone with a 2TB table will *never*
convert it to the new format. Which means we can never deprecate that
format, because lots of people will still be using it.
I continue to assert that all of this sounds like 9.3 work to me. I'm
really not keen on pushing through a hack which will make pushing in a
long-term solution harder.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com