From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
---|---|
To: | Bruce Momjian <bruce(at)momjian(dot)us> |
Cc: | 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: | 2009-07-14 00:28:58 |
Message-ID: | 20090714002858.GR4930@alvh.no-ip.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general pgsql-hackers |
Bruce Momjian wrote:
> Alvaro Herrera wrote:
> > Bruce Momjian wrote:
> > > Jamie Fox wrote:
> >
> > > > I can also see that the pg_largeobject table is different, in the pg_restore
> > > > version the Rows (estimated) is 316286 and Rows (counted) is the same, in
> > > > the pg_migrator version the Rows (counted) is only 180507.
> >
> > > Wow, I didn't test large objects specifically, and I am confused why
> > > there would be a count discrepancy. I will need to do some research
> > > unless someone else can guess about the cause.
> >
> > Maybe pg_largeobject is not getting frozen?
>
> That would explain the change in count, but I thought we froze
> _everything_, and had to.
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 ...
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
From | Date | Subject | |
---|---|---|---|
Next Message | Bruce Momjian | 2009-07-14 00:36:22 | Re: [GENERAL] large object does not exist after pg_migrator |
Previous Message | Tom Lane | 2009-07-13 23:18:09 | Re: [GENERAL] pg_migrator not setting values of sequences? |
From | Date | Subject | |
---|---|---|---|
Next Message | Andres Freund | 2009-07-14 00:34:03 | Re: *_collapse_limit, geqo_threshold |
Previous Message | Andrew Dunstan | 2009-07-13 23:35:10 | Re: Upgrading our minimum required flex version for 8.5 |