On Thu, May 2, 2013 at 02:20:15PM -0700, Kevin Grittner wrote:
> > Yes, pg_upgrade is never going to write to data pages as that
> > would be slow and prevent the ability to roll back to the
> > previous cluster on error.
>
> The only person who has suggested anything which would require that
> is Andres, who suggests adding a metadata page to the front of the
> heap to store information on whether the matview is populated. I
> think it is the direct opposite of what Tom is suggesting, and has
> too many issues to be considered at this time.
>
> Nobody has proposed how the technique currently used creates a
> pg_upgrade hazard now or in some future release where we provide a
> way for recovery to put the information into the catalog. I have
> gone into more detail on this earlier on this thread.
I was more thinking of the idea of having some status on the first page
that might need to change in a future release.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ It's impossible for everything to be true. +