RE: 10.2 listener won't start on same port as 9.2 listener

Because of the error message you are receiving, "ORA-12500: TNS:listener failed to start a dedicated server process", instead of a listener problem, check for the following line in your tnsnames.ora file(s):
If you find the line, delete it or sometimes setting it to SHARED will work. I've encountered that same error message numerous times, a real headache.


Bill Ferguson
U.S. Geological Survey - Minerals Information Team
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Denver Federal Center
Denver, Colorado 80225
Voice (303)236-8747 ext. 321 Fax (303)236-4208
~ Think on a grand scale, start to implement on a small scale ~

-----oracle-l-bounce@xxxxxxxxxxxxx wrote: -----

To: makbo@xxxxxxxxxxx
From: JayMiller@xxxxxxxxxxxxxxxx
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
Date: 09/20/2005 09:40AM
cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: 10.2 listener won't start on same port as 9.2 listener

No, the key is different.  I'm using the exact same listener.ora that I
for the 10.1 instance with the exception of the different ORACLE_HOME.  I
differentiate the keys by adding the instance name (e.g., KEY =

I'll speak with the SAs about running netstat --listening tonight.

I didn't try turning off both other listeners and then restarting all
but when I refreshed from my 10.1 backup the listener started up with no

Regarding the last question, see my response to Mladen.

One additional note on something I tried after sending the email to the
list.  I tried adding the 10.2 instance to one of the 9.2 listeners
(figuring I could run that way on a temporary basis) and while the
came up I was unable to connect.

This was the entry:

listener_rtb =
       (ADDRESS = (PROTOCOL = TCP)(HOST = usnjc01urp004)(PORT = 1526))

SID_LIST_listener_rtb =
   (SID_DESC =
     (ORACLE_HOME= /oracle/rtbp/product/9.2.0)
     (SID_NAME = rtbp)
   (SID_DESC =
     (ORACLE_HOME= /oracle/mds/product/10.2.0)
     (SID_NAME = mdsdb)
   (SID_DESC =
     (SID_NAME = PLSExtProc)
     (ORACLE_HOME = /oracle/rtbp/product/9.2.0)
     (PROGRAM = extproc)

This was the error I got when I tried to connect through the listener:
ORA-12500: TNS:listener failed to start a dedicated server process

I'm wondering now if the fact that I have PROGRAM = extproc but KEY =
EXTPROCRTB could possibly be an issue?  Something else to try once the
developers release the box to me tonight.

Jay Miller

-----Original Message-----
From: Mark Bole [mailto:makbo@xxxxxxxxxxx]
Sent: Tuesday, September 20, 2005 10:24 AM
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: 10.2 listener won't start on same port as 9.2 listener

Have you tried the above step first?  Note that ADDRESSes are not
limited to TCP protocol.  Perhaps you have a conflicting IPC key?  What
are the results of the "netstat --listening" command run as root?

Break the problem down through process of elimination.  Double-check
your ORACLE_HOME settings when starting each listener.  Eliminate all
but one ADDRESS for each listener, and then add them back in one at a

But, as Mladen stated, there is rarely a reason to run more than one
listener per machine.  Why do you need to do this?

Mark Bole


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