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Re: [GENERAL] large object does not exist after pg_migrator

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Jamie Fox <jfox(at)directcommerce(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [GENERAL] large object does not exist after pg_migrator
Date: 2009-07-20 20:55:07
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Lists: pgsql-generalpgsql-hackers
Bruce Momjian wrote:
> > After a quick chat with Bruce it was determined that we don't freeze
> > anything (it would be horrid for downtime if we did so in pg_migrator;
> > and it would be useless if ran anywhere else).  What we do is migrate
> > pg_clog from the old cluster to the new.  So never mind that hypothesis.
> > 
> > Bruce noticed that the pg_dump/pg_migrator combo is failing to restore
> > pg_largeobject's relfrozenxid.  We're not sure how this is causing the
> > errors Jamie is seeing, because what I think should happen is that scans
> > of the table should fail with failures to open pg_clog files
> > such-and-such, but not missing tuples ...
> Jamie, is it possible for you to apply the attached patch to the 8.4
> server, install the new pg_dump, and run the test again to see if
> pg_largeobject is fixed?  This patch properly sets the relfrozenxid in
> the system tables for each database.

I have applied the attached patch to have pg_dump restore
pg_largeobject.relfrozenxid in binary upgrade mode;   backpatched to

This doesn't fix the reported problem, but it is still a bug.

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + If your life is a hard drive, Christ can be your backup. +

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