From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Jeff <threshar(at)threshar(dot)is-a-geek(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Re: [Pg-migrator-general] Composite types break pg_migrated tables |
Date: | 2009-08-06 02:47:45 |
Message-ID: | 4A7A4451.6050106@dunslane.net |
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Tom Lane wrote:
> Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
>
>> preventing a clash might be fairly difficult.
>>
>
> Yeah, I was just thinking about that. The easiest way to avoid
> collisions would be to make pg_dump (in --binary-upgrade mode)
> responsible for being sure that *every* new pg_type and pg_class row
> OID matches what it was in the old DB. We could stop doing that
> once we have all the user tables in place --- I don't believe it's
> necessary to preserve the OIDs of user indexes. But we need to
> preserve toast table OIDs, and toast table index OIDs too if those
> are created at the same time they are now (else we risk one of them
> colliding with a toast table OID we want to create later).
>
> Oh, and pg_enum rows too.
>
> It seems doable, but we're certainly not going to back-patch
> any such thing into 8.4 ...
>
>
>
Is there any danger that an oid used in, say, pg_enum in the old version
will be used in the catalog bootstrap in the new version?
cheers
andrew
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