So i tried to run your pgbench command with the postgres user but it's stil telling me command not found
> Date: Wed, 26 Sep 2012 19:30:30 +0300
> Subject: Re: [PERFORM] Same query doing slow then quick
> From: lystor@gmail.com
> To: FFW_Rude@hotmail.com
> CC: pgsql-performance@postgresql.org
>
> On 26 September 2012 19:09, FFW_Rude <FFW_Rude@hotmail.com> wrote:
> > Could you explain what you are asking me to do because i don't really know
> > what i'm doing...
>
> postgresql-contrib packages contains pgbench tool on Ubuntu.
>
> For example postgresql-contrib-9.1_9.1.3-2_i386.deb on Ubuntu 12.04 contains:
> /usr/lib/postgresql/9.1/bin/pgbench
>
>
> > i don't have pgbench in it. It is still pgbench command not found...
>
> You need to run pgbench as postgres user.
> For example on CentOS:
> # su - postgres
> $ pgbench -i pgbench && pgbench -c 10 -t 10000 pgbench
>
>
> --
> With best regards,
> Nikolay