On a 2nd thought... where does the cach come into play when i only do inserts and no selects.
Alex
> Date: Fri, 18 Dec 2009 23:45:07 -0700
> Subject: Re: [GENERAL] PL/Perl Performance Problems
> From: scott.marlowe@gmail.com
> To: aintokyo@hotmail.com
> CC: tgl@sss.pgh.pa.us; pgsql-general@postgresql.org
>
> On Fri, Dec 18, 2009 at 11:37 PM, Alex - <aintokyo@hotmail.com> wrote:
> > Hmm...
> > how can that be. This is happening every day, so its not a one off or
> > happens once in the morning then in the afternoon. There is also no other
> > task running on the system, its dedicated to postgres.
> > Could the Autovacuum cause problems? Starting to invoke Analyze at the
> > beginning of the day but the keep silent till the day timestamp breaks ?
> > The think is that I have 4 servers setup in a similar way and all have
> > exactly the same problem.
>
> What cron jobs are on that machine that run at night? Note that on
> many OSes, maintenance crons are scheduled in a dir something like
> /etc/cron.daily etc... On my laptop they all run at midnight. I'm
> wondering if they're blowing out your cache so that you just don't
> have the same performance the first time you hit a particular dataset
> after they've run. Just a guess. You could try disabling them for a
> day and see what happens.
>
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