Re: 16-bit page checksums for 9.2

On Wed, Feb 29, 2012 at 2:18 PM, Alvaro Herrera
<alvherre@commandprompt.com> wrote:
> Note that if we want such an utility to walk and transform pages, we
> probably need a marker in the catalogs somewhere so that pg_upgrade can
> make sure that it was done in all candidate tables -- which is something
> that we should get in 9.2 so that it can be used in 9.3.  Such a marker
> would also allow us get rid of HEAP_MOVED_IN and HEAP_MOVED_OUT.

Getting rid of HEAP_MOVED_IN and HEAP_MOVED_OUT would be really nice,
but I don't see why we need to squeeze anything into 9.2 for any of
this.  pg_upgrade can certainly handle the addition of a new pg_class
column, and can arrange for in-place upgrades from pre-9.3 versions to
9.3 to set the flag to the appropriate value.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
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