"Marc Mamin" <M.Mamin@intershop.de> writes:
> if I try to SET log_connections = true
> (as super user, for another role)
> I get the error: parameter "log_connections" cannot be set after
> connection start.
Yeah ...
> I find it a bit surprising as this wouldn't affect the current session.
Nor would it affect any other session, so the error is to let you know
you're doing something useless/ineffective.
regards, tom lane