Can't increase max connections

[Peter Eisentraut]

I have installed PostgreSQL 7.3 on FreeBSD 4.10 Stable, and have been
trying to increase the max connections. the most I'm able to is 40,
if I increase it any higher I'm unable to start the database.

You need to show the error message if you want relevant help.

[Gaetano Mendola]

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Roberto De Shong wrote:

| I have installed PostgreSQL 7.3 on FreeBSD 4.10 Stable, and have been
| trying to increase the max connections. the most I'm able to is 40, if I
| increase it any higher I'm unable to start the database. Is there any
| tip, s hte any guide where I can get an idea of the other values to set
| in postgresql.conf for increasing max connections? I had also recompile
| the kernel and changed maxusers from 0 to 64. I'm not sure if increasing
| it even more would allow me increase connections. Would appreciate some
| help, thanks.

Most likely you are out of shared memory segments that you OS allow.
If you are on Linux try to pump-up shmmax and shmall

Regards
Gaetano Mendola



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[Roberto De Shong]

Actually I got it solved, I recompiled the kernel adding the options below:
options SYSVSHM
options SYSVSEM
options SYSVMSG
options SHMMAXPGS=65536
options SEMMNI=40
options SEMMNS=240
options SEMUME=40
options SEMMNU=120

And I made the following modifications to postgresql.conf:

shared_buffers = 4096
max_fsm_relations = 1024
max_fsm_pages = 16384
sort_mem = 4096

I was tthen able to increase it, I only set maxconnections to 200, because I'm using database pooling to manage connections which I'm only using 80 connections max.

Thanks.



Gaetano Mendola <***@bigfoot.com> wrote:
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Roberto De Shong wrote:

| I have installed PostgreSQL 7.3 on FreeBSD 4.10 Stable, and have been
| trying to increase the max connections. the most I'm able to is 40, if I
| increase it any higher I'm unable to start the database. Is there any
| tip, s hte any guide where I can get an idea of the other values to set
| in postgresql.conf for increasing max connections? I had also recompile
| the kernel and changed maxusers from 0 to 64. I'm not sure if increasing
| it even more would allow me increase connections. Would appreciate some
| help, thanks.

Most likely you are out of shared memory segments that you OS allow.
If you are on Linux try to pump-up shmmax and shmall

Regards
Gaetano Mendola



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Roberto De Shong


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[Gaetano Mendola]

Post by Roberto De Shong
options SYSVSHM
options SYSVSEM
options SYSVMSG
options SHMMAXPGS=65536
options SEMMNI=40
options SEMMNS=240
options SEMUME=40
options SEMMNU=120
shared_buffers = 4096
max_fsm_relations = 1024
max_fsm_pages = 16384
sort_mem = 4096
I was tthen able to increase it, I only set maxconnections to 200,
because I'm using database pooling to manage connections which I'm only
using 80 connections max.
Thanks.

So if you need 80 connections why did you use 200 on the postgres side ?
You waste shared memory if you have 120 connections more then necessary.

Are you using pgpoll ?


Regards
Gaetano Mendola