Re: Suggested fix for pg_dump

From: Philip Warner <pjw(at)rhyme(dot)com(dot)au>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, The Hermit Hacker <scrappy(at)hub(dot)org>
Cc: Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Suggested fix for pg_dump
Date: 2001-01-12 13:03:28
Message-ID: 3.0.5.32.20010113000328.02e2ad40@mail.rhyme.com.au
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At 13:29 7/01/01 -0500, Tom Lane wrote:
>The Hermit Hacker <scrappy(at)hub(dot)org> writes:
>> Essentially, worst case scenario, we are going from 'broken->broken' ...
>
>No, I don't think so. The current pg_dump code is only broken if
>you've renamed a column involved in a foreign-key dependency (if I
>understood the thread correctly). But Philip is proposing to change
>pg_dump to rely on alter table add constraint for *all* PRIMARY KEY
>constructs.

I've got a version of this working now, but it raises a further question:
should I also put the CHECK constraints into ALTER TABLE statements?
Eventually they should go there, but maybe not for 7.1 given the concerns
over ALTER TABLE ADD CONSTRAINT.

Reasons for:

- It's nicer
- It's more consistent with PK
- Can use pg_restore to restore tables without constraints

Reasons against:

- ALTER TABLE ADD CONSTRAINT is untested
- We're in beta, and the code ain't broke

I suspect the last point says it all...

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