Why my OEM reporting that listener is down?

Question

Hi All,
11.2.0.1
Linux 6
If I login via putty and check listener, it is ok. But my listener is configured as listener2 because I have other database with its own listerner1 name.
But why is that if I use OEM, it is asking for the default LISTENER with port 1521. Hence it is reporting as down. What can not it see the other configured LISTENER2???
Thanks,
pK
[oracle@DGOracleTest ~]$ echo $ORACLE_SID
orcl2
[oracle@DGOracleTest ~]$ lsnrctl status listener2
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 21-JAN-2014 14:36:33
Copyright (c) 1991, 2009, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1522)))
STATUS of the LISTENER
Alias                     listener2
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                20-JAN-2014 18:40:42
Uptime                    0 days 19 hr. 55 min. 50 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u02/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File         /u02/app/oracle/diag/tnslsnr/DGOracleTest/listener2/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1522)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=10.25.23.19)(PORT=1522)))
Services Summary...
Service "orcl2" has 1 instance(s).
  Instance "orcl2", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
[oracle@DGOracleTest ~]$ sqlplus system/manager@orcl2
SQL*Plus: Release 11.2.0.1.0 Production on Tue Jan 21 14:36:54 2014
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
Status
Down
Host
DGOracleTest
Port
1521
Name
LISTENER
Oracle Home
/u02/app/oracle/product/11.2.0/db_1
Location
/u02/app/oracle/product/11.2.0/db_1/network/admin
DetailsTNS-12541: TNS:no listener

Answer 1

f55237a7-2c38-4db3-a7a3-1d77256f0730 wrote:
I thank you all
I was just thinking that each app&db(which have different db versions) will independent on their own. If I retart app1+db1, it will not affects app2+db2. Sometimes our app need listeners to be restarted. I will also test DG on this machine, will DG on 11.2.0.1 listeners will be ok if I used the listener of 11.2.0.3?
Sometimes our app need listeners to be restarted.
I'd like to see the technical justification for this statement.  The listener is just a connection broker.  It receives a connection request, sets up the requested connection, then is out of the picture.  What action on the app could possibly cause a need for a listener restart?