Thanks for your reply. 

No we are not running OOM. ulimit o/p is as below. 

[postg...@server1 ~]$ ulimit
unlimited



--- On Thu, 12/11/09, Richard Huxton <d...@archonet.com> wrote:

From: Richard Huxton <d...@archonet.com>
Subject: Re: [GENERAL] DB Restart
To: "Sam Jas" <samja...@yahoo.com>
Cc: "general" <pgsql-general@postgresql.org>
Date: Thursday, 12 November, 2009, 10:39 AM

Sam Jas wrote:
> 
> 
> 
> Hi,
> 
> We are facing issue with the RES memory. Below is the o/p of
> top command. It shows that writer process reserved 3.8g. We have observed that
> if it increased to 3.9g we need to restart the db. Otherwise it hangs.  
> Kindly suggest us the good way to figure it out this issue.   shared_buffer
> is 3 GB.   

Are you saying that you're running out of memory overall, or do you have
a ulimit issue for the postgres user?

-- 
  Richard Huxton
  Archonet Ltd

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