Re: terminating autovacuum process due to administrator command

On 06/25/2012 11:00 PM, Radovan Jablonovsky wrote:
> Thanks for response,
>
> How were the connections refused (error message)?
> 2012-06-13 13:45:38.809 MDT [25172]: [1-1] FATAL: remaining
> connection slots are reserved for non-replication superuser connections
> 2012-06-13 13:45:38.889 MDT [25173]: [1-1] FATAL: remaining
> connection slots are reserved for non-replication superuser connections
> 2012-06-13 13:45:38.895 MDT [25174]: [1-1] FATAL: remaining
> connection slots are reserved for non-replication superuser connections
>
> Could it be that there are already max_connections
> sessions? max_connection was set to 600, when issue occurred the db
> server had 85 connection and server was under medium load.

I can't explain why it was topping out at 85 when it was set to 600, but
- I strongly recommend that you switch to a connection pool and lower
your max_connections considerably. You'll likely get much better
performance with max connections at 20 or less - the usual rule of thumb
is "num_hdds + num_cpus" but in reality you need to benchmark and tune
to work out what's best.

pgbouncer is a good light-weight pooling option.

--
Craig Ringer