Re: Strang behaviour SELECT ... LIMIT n FOR UPDATE

Tom Lane wrote:
> "Daniel Caune" <daniel.caune@ubisoft.com> writes:
> > It seems that, in certain condition, row (199,84) is shadowing row
> > (3702,85);
> 
> This would be the expected behavior if row (199,84) were an updated
> version of row (3702,85), but you couldn't see it yet in your current
> transaction snapshot.  A plain SELECT would show the older version
> (the current one according to the snapshot) while SELECT FOR UPDATE
> would show the newest committed version.

Hmm.  We've been studying a case on one customer where xmin/xmax seem to
be corrupted.  It has had ups and downs because I have my doubts about
their storage system, but I'm not completely sure that it can be really
blamed.

This is on 8.1.10.

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