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From: Tom Lane <[email protected]>
To: Heikki Linnakangas <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Cc: Chris Browne <[email protected]>
Cc: [email protected]
Subject: Re: [DOCS] Autovacuum and XID wraparound
Date: Wed, 16 May 2007 16:30:18 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Heikki Linnakangas <[email protected]> writes:
> Tom Lane wrote:
>> Heikki Linnakangas <[email protected]> writes:
>>> Now that I think this a bit more, I think CLUSTER should freeze the 
>>> tuples.
>> 
>> I disagree with that...

> Ok. Why?

It's removing potentially-important data without any notice or recourse
to the user.  There seems to be a contingent around here that thinks
that as soon as xmin is older than GlobalXmin it is no longer of
interest to anyone, but I have lost count of how often I have found it
invaluable for forensic purposes.  I have resisted having VACUUM freeze
tuples before they've reached a quite-respectable age, and I object to
having CLUSTER do it either.

I could maybe accept a CLUSTER FREEZE option to do this, but that's not
what's in the patch.

			regards, tom lane

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