Skip site navigation (1) Skip section navigation (2)

Re: OutOfMemory hibernate scroll with 2M records | Postgresql 8.4 DB

From: Ankit Kumar <ankitk(at)xebia(dot)com>
To: Greg Stark <gsstark(at)mit(dot)edu>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: OutOfMemory hibernate scroll with 2M records | Postgresql 8.4 DB
Date: 2009-12-21 17:04:24
Message-ID: 4B2FAA98.5050302@xebia.com (view raw or flat)
Thread:
Lists: pgsql-bugs
Hi Greg

Thanks for your response. Hibernate works well when I change the DB to 
SQL server but somehow the moment I point to Postgresql it start 
generating OutOfMemory. Is there some configuration at DB end to ensure 
it starts using the cursors.

See link: http://forum.springsource.org/archive/index.php/t-23170.html

Regards
Ankit

Greg Stark wrote:
> On Mon, Dec 21, 2009 at 12:54 PM, Ankit Kumar <ankitk(at)xebia(dot)com> wrote:
>   
>> I am running a Criteria.scroll() on postgresql on a DB containing 2M
>> records. The memory keeps increasing and finally it generates an
>> OutOfMemoryException. Please can you advice how to fix this.
>>
>> Postgresql DB version: 8.4
>> Postgresql Driver Used: postgresql-8.4-701.jdbc4.jar
>>
>> Some forums do mention that "scroll" is slow on Postgresql.
>>
>> Is this a known issue or we need to do something specific to make scroll
>> work on Postgresql?
>>
>>
>> Exception StackTrace:
>> java.lang.OutOfMemoryError: Java heap space
>>
>>     
>
> This looks like a Java error, not a Postgres one. It looks like
> Hibernate is asking for the entire result set back from Postgres
> instead of using a scrollable cursor and is trying to hold it all in
> RAM. You should ask the Hibernate people if they plan to either spill
> to disk or use database-side cursors which certainly do if necessary.
>
>   

In response to

Responses

pgsql-bugs by date

Next:From: Greg StarkDate: 2009-12-21 17:25:41
Subject: Re: OutOfMemory hibernate scroll with 2M records | Postgresql 8.4 DB
Previous:From: Dave PageDate: 2009-12-21 14:07:02
Subject: Re: BUG #5251: compilation fails in 32-bit mode

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group