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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: (view raw, whole thread or download thread mbox)
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                        |
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