On 9/11/07, Tom Lane <tgl@sss.pgh.pa.us> wrote: "Pavan Deolasee" <pavan.deolasee@gmail.com> writes:
> I would actually think twice before even doing this because this would
> lead to complete change in heap page structure and stop people from
> upgrading to 8.3 without a complete dump/restore. I don't remember 8.3
> introduces any other significant change which already enforces that.
Then you don't remember far enough --- either the HeapTupleHeader change
or the varvarlena change would be enough to prevent that. For that
matter, the pd_flags header field that the patch is already relying on
is new for 8.3.
Oops! I forgot combo command id. That went into last major release of EDB
and that confused me. Regarding pd_flags, I thought somebody can just
fix that in-place and avoid dump/restore (of course, its too invasive, but
isn't it feasible with pg_migrator ?)
Anyways, given this, should we go for storing xmin in the page header ?
For that matter should there be a separate heap page header ?
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB
http://www.enterprisedb.com