Re: Bug: Unreferenced temp tables disables vacuum to update xid

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On Mon, 7 Jan 2008 11:58:29 -0500 (EST)
Bruce Momjian <bruce(at)momjian(dot)us> wrote:

> > > Ah -- interesting. This is a known issue, but we haven't found a
> > > solution yet.
> > >
> >
> > Is there bug number?
>
> I assume it is this TODO item:
>
> o Prevent long-lived temporary tables from causing frozen-xid
> advancement starvation
>
> The problem is that autovacuum cannot vacuum them to set
> frozen xids; only the session that created them can do that.
> http://archives.postgresql.org/pgsql-general/2007-06/msg01645.php
>
> but am confused how the fix worked. Have all of these backends been
> active for 1 billion transactions?

Well it certainly appears that the TODO item is related. However there
are a couple of differences.

1. I had to manually vacuum because we had already hid xidStoplimit.

2. Postgres has been restarted multiple times and it made zero
difference.

E.g; PostgreSQL isn't cleaning up after itself and it isn't apparent
when it happens.

Sincerely,

Joshua D. Drake

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