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Re: Sometime Update is not modifying data inside database.

From: Craig James <cjames(at)emolecules(dot)com>
To: Amit Kumar <helloamit5(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org, amit(dot)jain(at)netcore(dot)co(dot)in
Subject: Re: Sometime Update is not modifying data inside database.
Date: 2012-07-30 16:52:39
Message-ID: CAFwQ8rfgEvG9BTLU6UZxVv7twCuudMt50a1Msu6oFFmb=hv_UQ@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-admin
On Mon, Jul 30, 2012 at 4:06 AM, Amit Kumar <helloamit5(at)gmail(dot)com> wrote:

> All,
>
> I am facing a weired issue in PG 9.0.3. Sometime via application UPDATES
> are not changing data in the database but in postgres logs its also not
> raising any error.  It is happening 2-3 times in a week. I have tried but
> not able to reproduce this error. fsync is ON.  We are not using hibernate
> and no pg pool or any other tool inside database.   The  application
> running from last 4-5 year but from last few days we are experiencing some
> times UPDATE is not updating records in database, without giving any
> error.  No changes has been made in database or server recently.
>
> *UPDATE dbpush_camp_main SET status=7 WHERE camp_id IN(137721)*
>
> Below is the logs of database.
>
> <snip>
> Jul 30 12:40:36 dell16 postgres[11088]: [11-1] 2012-07-30 12:40:36 IST
> [11088]: [10-1] user=postgres,db=dbpush xxxxxxxxxxxxxxxxxx(43225)LOG:
> statement: START TRANSACTION
> Jul 30 12:40:36 dell16 postgres[11088]: [12-1] 2012-07-30 12:40:36 IST
> [11088]: [11-1] user=postgres,db=dbpush xxxxxxxxxxxxxxxxxx(43225)LOG:
> statement: *UPDATE dbpush_camp_main SET status=7 WHERE camp_id IN(137721)*
> Jul 30 12:40:36 dell16 postgres[11088]: [13-1] 2012-07-30 12:40:36 IST
> [11088]: [12-1] user=postgres,db=dbpush xxxxxxxxxxxxxxxxxx(43225)LOG:
> statement: COMMIT
> Jul 30 12:40:36 dell16 postgres[9368]: [5-1] 2012-07-30 12:40:36 IST
> [9368]: [4-1] user=postgres,db=dbpush xxxxxxxxxxxxxxxxxx(43187)LOG:
> statement: SELECT status FROM  dbpush_camp_main  WHERE camp_id=137721
> </snip>
>
> The size of database is 237GB, AND dbpush_camp_main  table size is 37MB
> with 36888 records and one primary key. status is a integer field.
>
> Please share your thoughts.  Thanks a lot in Advance !!
>

You've almost certainly got problems with overlapping transactions, where
the process making the change and the process testing the change are
looking at different "snapshots" of the data.  The "snapshot" started when
each one started its own transaction.

Craig

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