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From: Tom Lane <[email protected]>
To: Jan Wieck <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Christopher Kings-Lynne <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: PostgreSQL Development <[email protected]>
Subject: Re: Release cycle length
Date: Fri, 21 Nov 2003 14:08:28 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Jan Wieck <[email protected]> writes:
> Alvaro Herrera wrote:
>> One of the most complex would be to avoid the need of pg_dump for
>> upgrades ...

> We don't need a simple way, we need a way to create some sort of catalog 
> diff and "a safe" way to apply that to an existing installation during 
> the upgrade.

I still think that pg_upgrade is the right idea: load a schema dump from
the old database into the new one, then transfer the user data files and
indexes via cheating (doubly linking, if possible).  Obviously there is
a lot of work still to make this happen reliably, but we have seen
proof-of-concept some while ago, whereas "catalog diffs" are pie in the
sky IMHO.  (You could not use either the old postmaster version or the
new version to apply such a diff...)

A big advantage of the pg_upgrade concept in my mind is that if it fails
partway through, you need have made no changes to the original
installation.  Any mid-course problem with an in-place-diff approach
leaves you completely screwed :-(

			regards, tom lane

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