Re: Re:Multiple Listeners

hello Edward,

If I understand wrong, ignore this message.

As I understand, "listener listens requests of client processes, then passes them to server processes."

When I client connects to server, It uses a random port on client and uses listener port number of server. After server receives requests on listener port, listener process creates new dedicated process and assigns a new random port number to new dedicated process. This is called redirection. After new port is assigned to dedicated server, this port number is transmitted to client process. Then, all subsequent requests of client are done between client's current port and new assigned server port, not listener port. Listener is no longer is used. That is why when a listener is stopped, active client processes keep running. That is why although listener port is registered in firewall definitions, users get problem since new assigned random port may not be registerd in firewall.

This can be seen in sql*net level-16 traces.

regards...

17/7/01 01:55:53, dgoulet_at_vicr.com wrote:

>Edward,
>
> One must ask, what benefit do you perceive you will obtain from having
>multiple listeners? The listener is only there to hear the end applications
>request for database service and pass them along to the appropriate dedicated
>server or dispatcher as required. Then it goes off to do other things. We
have
>one HP with 9 different instances, one listener. Works fine all day.
>
>Dick Goulet
>
>____________________Reply Separator____________________
>Author: "Edward W. Carr" <ecarr_at_qwest.com>
>Date: 7/16/2001 1:42 PM
>
>Hello All,
>
>I am currently running Oracle 816 64bit on a Solaris 8 box. I have three
>databases on the system with one LISTENER for all of them. Is it possible
>to configure multiple listeners, one for each database? We have tried in
>the past with no success... If there is a document on the web somebody could
>point me to, that would be great! I have searched for one but must not be
>searching correctly.
>
>TIA,
>----------------------------------------------
>Edward W. Carr
>UNIX Systems Administrator
>Qwest Communications
>Broadband Services Inc.
>
>
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