Re: Scaling / Number of simultanous connections

Am 07.02.19 um 18:43 schrieb Nico Callewaert:
> Hi,
>
> I'm about to start porting a Firebird DB to Postgres. Next thing will 
> be upgrading all customers. Most of our customers have around 30 users 
> or less. We have a few 'bigger' customers that maybe have 50 users or 
> a bit more still. The application is a Delphi application that is in 
> fact a 'fat' client that uses a permanent connection to the DB. I've 
> read that Postgres uses 1 process per user. So that means 30-50 
> processes at the same time.
>
> I have 2 questions about this
> - I guess this situation is not really a heavy workload? Or is it?

not really, assuming not all connections are active the same time.

> - And is it correct that a single process cannot access multiple CPU 
> cores, so things are not multi threaded? I guess MySQL used that 
> argument somewhere, but I'm not sure, forgive me if I'm mistaken.

yes and no, since 9.6 we can use multiple cores for one query, using 
multiple processes.


>
> The whole thing boils down to this question: Am I save with 30-50 
> simultanous users for speed and scaling?
>

most likely yes, on modern hardware.


Regards, Andreas

-- 
2ndQuadrant - The PostgreSQL Support Company.
www.2ndQuadrant.com