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Re: Bug #807: Sequence currupted on recovery after kill -9

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Robert Hentosh <hentosh(at)io(dot)com>
Cc: mthomp(at)tierfleet(dot)com, pgsql-bugs(at)postgresql(dot)org
Subject: Re: Bug #807: Sequence currupted on recovery after kill -9
Date: 2002-10-29 18:54:22
Message-ID: 200210291854.g9TIsMZ14339@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-bugs
Robert Hentosh wrote:
> On Tue, 29 Oct 2002 pgsql-bugs(at)postgresql(dot)org wrote:
> 
> > Matt Thompson (mthomp(at)tierfleet(dot)com) reports a bug with a severity of 2
> > The lower the number the more severe it is.
> > 
> > Short Description
> > Sequence currupted on recovery after kill -9
> > 
> > Long Description
> > If you create a file with an implied sequence and do a couple of inserts, then do a kill -9, when you start up again, the sequence will have a corrupted next_value field.  In the example, the value of last_value is 4 before the kill -9 and 34 when it comes back up.
> > 
> 
> 
> The purpose of a sequence is not to insure that the numbers are 
> consecutive, only to insure that they are unique. If you have failed 
> inserts, you will see holes also.
> 
> I don't know off the top of my head how to do consecutive numbers.  Maybe 
> only with a table lock.

Right.  Sequences aren't consecutive anyway because an ABORT will not
reuse the sequence value.  There is an FAQ on that.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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