A listener by server or a listener instance?  What is the best practice?

I joined a company owner and new oracle DBA uses a listener and a port (by default) by server.  We have 7 instances of oracle on a server database using the same listener.  I always created a new listener. / netca or make entries manually by database instance. / dbca

What is the best practice?  My argument for the creation of a separate listener is to be able to restrict connections and accelerator by database using the parameters and the params of the listener.  With a listener, it seems impossible to use several listener settings or settings since all the dB to use it only a listener.  Also if the listener does not have any new connection for all the dB to use it on the server.

What is the best practice?

The best practice is what works best for you in your particular environment

Personally I have found don't have much need to adjust the configuration of the listener for each separate instance so in my environment of each server has 1 single earphone that is shared by several bodies. I can see your points about the benefits of having separated from listeners, but also additional administration required for the best answer is the one that is right for you. Some of the servers I maintain may have up to 20 instances (development) so having 20 listeners is probably a little more work I want keep.

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