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Re: Using ALTER TABLESPACE in pg_dump

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>,Philip Warner <pjw(at)rhyme(dot)com(dot)au>,Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>,PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Using ALTER TABLESPACE in pg_dump
Date: 2004-10-25 21:43:46
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Tom Lane wrote:
> Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> writes:
> > I disagree on the view that being able to restore a database on another 
> > machine after a crash is an "abstract second-order goal";-)
> > ISTM that the core business of a database is to help organize and protect 
> > data, and it is plainly that. You just wish you won't need it, so it is 
> > somehow "abstract", but when and if you need it, it is not "second-order" 
> > at all;-) and it is much too late to redo the dump.
> So you create some tablespaces by hand.  Big deal.  This objection is
> not strong enough to justify an ugly, klugy definition for where tables
> get created.
> If tablespaces had to be associated with physically distinct devices
> then there would be merit in your concerns, but they are only
> directories and so there is no reason that you cannot create the same
> set of tablespace names on your new machine that you had on your old.

I am confused.  I thought Tom's argument was that we shouldn't add an
overly complex tablespace SET variable just to prevent the non-standard
TABLESPACE in CREATE, which I can understand.  However, the text above
seems to indicate we don't need an 'ignore tablespace specification if
it does not exist' which I think we do need for cases where we want to
restore on to a system that doesn't use tablespaces or for
non-super-user restores.

  Bruce Momjian                        |
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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