What kind of resource demand does the standalone listener create?

Hi all -
I'm wondering what kind of resource load is consumed by the separating the listener off of the database. I guess I was under the impression the listener doesn't really do much at all other than handle the connections and calls to the database. Is it correct in assuming the majority of the resource consumption is still actually on the database or does the listener have a more impacting role?
The question goes into determining what kind of processing power would be needed for a server that is only hosting the listener. Seeing as there really isn't anything that changes within the environment I'm wondering if it's really necessary to have multiple VM's setup for the sole purpose of hosting the listener. On that same note, is separating the listener onto a separate machine really removing any processing demand from the database?
Thanks :)

Hi,
it seems you mixed up the database listener with APEX Listener. The APEX Listener is not an alternative for the database listener (you'll still need it when using the APEX Listener), but can be an alternative web server for the Embedded PL/SQL Gateway (EPG, using the database's internal XDB HTTP Server) or Oracle HTTP Server (OHS) to host your APEX instance.
So as ALEX points out, it'll need about as much resources as one of the other web servers would. How much it will be depends on your usage scenario. Again, there is no immediate relation to the database listener.
-Udo

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