There are two additional patches in the VACUUM code.  One is Heikki's
patch to recalculate OldestXmin in the vacuum run.
(much nicer than our archives because the whole thread is there, not
just month-sized pieces).

That thread ended without any conclusion; it is said that the patch will
be reconsidered when Simon Riggs' patch about the WAL flushing bug
lands, but I don't know what patch is that.  Is it in the patch queue?
Was it already applied?

The problem with the patch is that the DBT-2 test showed decreased
performance, but that was still under investigation.

What is the status of this?

The other patch was ITAGAKI Takahiro's patch to fix n_dead_tuples in
pgstats after VACUUM when there is concurrent update activity.  This
patch is still on hold largely because the above patch would cause it to
be a bit obsolete.  So I think if we're not going to apply the former,
we should apply this one.


Alvaro Herrera                      
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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