Optimal values for 500 connections

On Fri, Jun 26, 2009 at 12:52 PM, Pedro Doria
Meunier<pdoria@netmadeira.com> wrote:

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Hi all,

I'm wondering what are the correct values in postgresql.conf for
max_connections = 500 ...

The values I had in 8.2.13 conf file worked without a problem but with
the new 8.3.7 postmaster simply refuses to start.

Any pointers would be highly appreciated ;-)

You likely need to increase max shared mem. With linux that's easy to do with

sysctl -a|grep shm

to get a list, and then copy and paste with changes to
/etc/sysctl.conf. Look them up on the google, or in our docs, some
good examples both places.

Note that anytime the postmaster doesn't startup it tries to log it
somewhere. Look for postmaster logs and such.

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Thank you Scott!

As always your advice is right to the point ;-)
That solved it.

Best regards,

Pedro Doria Meunier
GSM: +351 96 17 20 188
Skype: pdoriam

Scott Marlowe wrote:

On Fri, Jun 26, 2009 at 12:52 PM, Pedro Doria
Meunier<pdoria@netmadeira.com> wrote:

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Hi all,

I'm wondering what are the correct values in postgresql.conf for
max_connections = 500 ...

The values I had in 8.2.13 conf file worked without a problem but
with the new 8.3.7 postmaster simply refuses to start.

Any pointers would be highly appreciated ;-)

You likely need to increase max shared mem. With linux that's easy
to do with

sysctl -a|grep shm

to get a list, and then copy and paste with changes to
/etc/sysctl.conf. Look them up on the google, or in our docs, some
good examples both places.

Note that anytime the postmaster doesn't startup it tries to log it
somewhere. Look for postmaster logs and such.

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On Fri, Jun 26, 2009 at 07:52:43PM +0100, Pedro Doria Meunier wrote:

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Hi all,

I'm wondering what are the correct values in postgresql.conf for
max_connections = 500 ...

You can either increase your shared memory settings or see about a
connection pooler such as pgbouncer. The latter will be lighter on
your system at the cost of maintaining another component.

Cheers,
David.

The values I had in 8.2.13 conf file worked without a problem but with
the new 8.3.7 postmaster simply refuses to start.

Any pointers would be highly appreciated ;-)

BR,

- --
Pedro Doria Meunier
GSM: +351 96 17 20 188
Skype: pdoriam

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