Hi,
The following link will help you
http://www.powerpostgresql.com/Downloads/annotated_conf_80.html
On 12/7/05, Anne M. Hammond <hammond@solarz.colorado.edu> wrote:
> This is running on a Solaris 8 machine.
>
> I installed V 7.4.7 to use with OpenACS.
>
> lcd[34]% /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
> ...
> selecting default max_connections... 10
> selecting default shared_buffers... 50
> creating configuration files... ok
> creating template1 database in /usr/local/pgsql/data/base/1... FATAL:
> could not create shared memory segment: Invalid argument
> DETAIL: Failed system call was shmget(key=1, size=1081344, 03600).
> ...
>
> lcd[36]% sysdef -i | grep SHMMAX
> 1048576 max shared memory segment size (SHMMAX)
>
> -----------
> So the shared memory request is greater than the SHMMAX in
> the kernel. If I just wanted to use a smaller number of shared_buffers
> (24), I tried editing /usr/local/pgsql/data/pgsql.conf.
>
> But initdb -D /usr/local/pgsql/data
> finds that the directory is not empty and will not create the databases.
> I have also tried
> setenv PGOPTIONS="shared_buffers = 24"
> and tried initdb, but initdb uses the default number.
>
> Could you tell me how to set shared_buffers from the default so
> that a smaller shared memory segment will be requested?
>
> If you could also tell me how to set the max_connections to a value
> different from the default, that would be great.
>
> Any advice appreciated.
>
> Anne Hammond, University of Colorado at Boulder
>
>
>
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--
Regards
Pandu