Re: Upgrading rant.

From: Greg Copeland <greg(at)CopelandConsulting(dot)Net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Oliver Elphick <olly(at)lfix(dot)co(dot)uk>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Hannu Krosing <hannu(at)tm(dot)ee>, mlw <pgsql(at)mohawksoft(dot)com>, Lamar Owen <lamar(dot)owen(at)wgcr(dot)org>, PostgresSQL Hackers Mailing List <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Upgrading rant.
Date: 2003-01-04 18:23:46
Message-ID: 1041704626.15933.227.camel@mouse.copelandconsulting.net
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On Sat, 2003-01-04 at 09:53, Tom Lane wrote:
> Oliver Elphick <olly(at)lfix(dot)co(dot)uk> writes:
> > On Sat, 2003-01-04 at 02:17, Tom Lane wrote:
> >> There isn't any simple way to lock *everyone* out of the DB and still
> >> allow pg_upgrade to connect via the postmaster, and even if there were,
> >> the DBA could too easily forget to do it.
>
> > I tackled this issue in the Debian upgrade scripts.
>
> > I close the running postmaster and open a new postmaster using a
> > different port, so that normal connection attempts will fail because
> > there is no postmaster running on the normal port.
>
> That's a good kluge, but still a kluge: it doesn't completely guarantee
> that no one else connects while pg_upgrade is trying to do its thing.
>
> I am also concerned about the consequences of automatic background
> activities. Even the periodic auto-CHECKPOINT done by current code
> is not obviously safe to run behind pg_upgrade's back (it does make
> WAL entries). And the auto-VACUUM that we are currently thinking of
> is even less obviously safe. I think that someday, running pg_upgrade
> standalone will become *necessary*, not just a good safety feature.
>
> regards, tom lane

I thought there was talk of adding a "single user"/admin only mode.
That is, where only the administrator can connect to the database.

--
Greg Copeland <greg(at)copelandconsulting(dot)net>
Copeland Computer Consulting

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