* Andres Freund (and...@2ndquadrant.com) wrote: > On 2014-03-31 09:09:08 -0400, Stephen Frost wrote: > > * Alvaro Herrera (alvhe...@2ndquadrant.com) wrote: > > > I guess I wasn't expecting that too-old values would last longer than a > > > full wraparound cycle. Maybe the right fix is just to have the second > > > check also conditional on allow_old. > > > > I don't believe this was a wraparound case. > > Could you show pg_controldata from the old cluster?
Per the original email-
The *OLD* (9.2.6) control data had:
pg_control version number: 922
Catalog version number: 201204301
Latest checkpoint's NextXID: 0/40195831
Latest checkpoint's NextOID: 53757891
Latest checkpoint's NextMultiXactId: 1601462
Latest checkpoint's NextMultiOffset: 4503112
Latest checkpoint's oldestXID: 654
Latest checkpoint's oldestXID's DB: 12870
Latest checkpoint's oldestActiveXID: 0
(It doesn't report the oldestMulti info under 9.2.6).
Was there something else you were looking for?
> > I don't think the xmax value is a multixact at all- I think it's
> > actually a regular xid, but everyone is expected to ignore it because
> > XMAX_IS_INVALID, yet somehow the MULTIXACT bit was also set and the new
> > code expects to be able to look at the xmax field even though it's
> > marked as invalid..
>
> XMAX_IS_INVALID was never allowed to be ignored for vacuum AFAICS. So I
> don't think this is a valid explanation.
The old 9.2 cluster certainly had no issue w/ vacuum'ing this
table/tuple. Unfortunately, I can't have the 9.2 debug packages
installed concurrently w/ the 9.3 debug packages, so it's a bit awkward
to go back and forth between the two. Anything else of interest while I
have the 9.3 instance running under gdb? Sent the requested backtrace
in another email.
Thanks,
Stephen
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