From: Ross J. Reedstrom <reedstrm@rice.edu>
To: pgsql-sql@postgresql.org
Subject: Re: strangest thing happened
Date: Wed, 7 Jul 2010 15:42:45 -0500
Message-ID: <20100707204244.GB28181@rice.edu> (raw)
In-Reply-To: <4C34F0B9.5020902@magwerks.com>
References: <201007071259.03294.johnf@jfcomputer.com>
<4C34F0B9.5020902@magwerks.com>
On Wed, Jul 07, 2010 at 04:25:13PM -0500, Justin Graf wrote:
> Are you using PG's sequence/auto increment???
>
> If so.
> Once PG fires off the nextval() for the sequence that number is
> considered used and gone even if the transaction that called nextval()
> is rolled back
>
> Depending on how the app is written nextval() might be called, but allow
> the User to cancel the invoice creation before the insert into table is
> completed eating up Invoice numbers
>
> To reset Sequences number call
> Select setval('Sequence_Name', VAlue_To_Set_To);
>
> Most people ignore this kind of annoyance when sequence numbers jump.
> Now if it happens all the time where every X hours eating up Z number of
> sequence numbers then one needs to dig into the logs and figure out what
> is calling nextval()
>
> Search the logs to see what is calling nextval('My_Sequence')
>
> You may need to turn up logging to find it.
Justin, you're missing that John reported that the sequences are
_behind_ the table. This only happens for me if I've been doing
bulk data loads. Then I use:
select setval(sequence_name,max(serial_id_column)) from table_with_serial_id;
You do need to trackdown how this might have happened, though. Any
clever code doing it's own 'serial' incrementing?
Ross
--
Ross Reedstrom, Ph.D. reedstrm@rice.edu
Systems Engineer & Admin, Research Scientist phone: 713-348-6166
The Connexions Project http://cnx.org fax: 713-348-3665
Rice University MS-375, Houston, TX 77005
GPG Key fingerprint = F023 82C8 9B0E 2CC6 0D8E F888 D3AE 810E 88F0 BEDE
>
>
> On 7/7/2010 2:59 PM, John wrote:
> > I am the only developer, DBA etc.. for a small project. Today (yesterday was
> > everything was perfect) many of the sequence numbers fell behind what is the
> > actual PK value. For example the invoice PK sequence current value = 1056
> > but the table PK was 1071. Nobody (other than myself) knows how to
> > edit/access the postgres server. So
> >
> > 1. Does anyone know how this could have happened?????? Other than human
> > interaction.
> >
> > 2. Does anyone have a script to reset the sequences to match the tables?
> >
> > Thanks in advance,
> >
> > Johnf
> >
> >
>
>
>
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To: pgsql-sql@postgresql.org
Cc: reedstrm@rice.edu
Subject: Re: strangest thing happened
In-Reply-To: <20100707204244.GB28181@rice.edu>
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