Sometime Update is not modifying data inside database.

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 !!

--
--With Best Regards
Amit Jain
#9833777592

"The best reason for having dreams is that in dreams no reasons are
necessary"