Thanks by the answer.
The iowait is very low i think, it's varies between 0.14 and 1.1 and cpu 98% idle during this time.
OS and hardware problems were the first things that i
thought and tested and until now nothing strange.
It's writing to local disk.
Any suggestion or idea will be welcome.
Tomorrow I will post my postgresql.conf because today is holiday here in Brazil and I don't have acess to the servers from my home.
> Date: Thu, 30 May 2013 14:54:51 -0500
> Subject: Re: [NOVICE] Copy to Csv file extremely slow
> From: mmoncure@gmail.com
> To: jalissonmeneses@hotmail.com
> CC: pgsql-novice@postgresql.org
>
> On Thu, May 30, 2013 at 12:48 PM, Jalisson Mello
> <jalissonmeneses@hotmail.com> wrote:
> > Hi, I´m using the copy command to generate a csv file, but the generation
> > its extremely slow in a production server. In our test's server this copy
> > takes 20 minutes but in a production server this takes 2 days.
> >
> > The database that i used to the tests is a copy of the production database.
> > The machines are totaly differents. Test Server is a simple Intel core 2
> > duo 2.8 ghz with 8 GB Ram and Production Server has 2 xeon 2.8 ghz with 24
> > GB RAM.
> >
> > Before the tests we ran vacuum and closed all another connections.
> > The query takes 19 minutes and file generation less than 1 minute to create
> > a file with 473 MB in the tests server. In Production server the query runs
> > in the same 19 minutes, but file generation 2 days.
> >
> > I'm running postgresql 9.0 on CentOS 6.3 on both machines.
> >
> > Any idea about this big difference.
> >
> > Thanks , and sorry by my english.
>
>
> have you ruled out o/s problems? what's iowait during this time? is
> database writing to local storage?
>
> merlin
>
>
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