Re: could not truncate directory "pg_subtrans": apparent wraparound

On Sun, May 23, 2010 at 9:02 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Mikko Partio <mpartio(at)gmail(dot)com> writes:
> > got the following line at postgresql log:
>
> > May 16 01:17:35 xxx postgres[25550]: [1-1] LOG: could not truncate
> > directory "pg_subtrans": apparent wraparound
>
> > PostgreSQL 9.0beta1 on x86_64-unknown-linux-gnu, compiled by GCC gcc
> (GCC)
> > 4.1.2 20080704 (Red Hat 4.1.2-46), 64-bit
>
> Where did this beta1 installation come from --- was it freshly initdb'd
> under 9.0, or did you use pg_upgrade on a pre-existing database that had
> been around for awhile? It strikes me that the recently identified bug
> in pg_upgrade about not fixing the datfrozenxid of template0 might
> possibly explain this. You'd need to have upgraded an installation that
> was at least a couple billion transactions old to hit that bug.
>

It was freshly initdb'd with beta1 binaries, the contents were loded from a
pg_dump file. The number of transactions is very small, we're talking about
thousands (not billions). This database is the master of a hot standby
installation, if that matters.

Regards

Mikko