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Re: Sequences - jumped after power failure

From: "Sean Davis" <sdavis2(at)mail(dot)nih(dot)gov>
To: steve(at)retsol(dot)co(dot)uk
Cc: PostGreSQL <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Sequences - jumped after power failure
Date: 2008-04-15 09:47:33
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
On Tue, Apr 15, 2008 at 4:21 AM, Steve T <steve(at)retsol(dot)co(dot)uk> wrote:
>  Is it possible for a whole set of sequences to suddenly 'jump'?
>  I have a set of claims tables that cover the claim itself, the customer,
> contact points etc. Yesterday there was a power failure and the server
> suffered an immediate power outage. When the server came back, everything
> seemed fine, apart from the fact that the claim related sequences had all
> jumped and left a gap of 33 (last was 52 before power failure, next one
> allocated after power failure 85). This seems consistent across all the
> tables related to the claim (it may be across the   tables in the database -
> I haven't checked all of them as yet).
>  Does this sound feasible and if so, what is the cause?

One explanation: if there were uncommitted transactions at the time of
the power failure, the sequence would have been advanced, but the
corresponding rows would not have entered the database.


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