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From: Heikki Linnakangas <[email protected]>
To: Tom Lane <[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 21:35:20 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Tom Lane wrote:
> 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.

How about freezing anything older than vacuum_freeze_min_age, just like 
VACUUM does?

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

I wouldn't like to add more options to CLUSTER, people are already 
confused about the similar VACUUM options.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

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