EM configuration for Oracle beginners

The following error occurs when ORACLE11gR264-bit em is started: [root @ localhost ~] # Su

ORACLE 11g R2 64-bit em startup with the following error: [root @ localhost ~] # Su-oracle [oracle @ localhost ~] $ Emctl start dbconsoleEnvironm

Oracle 11g R2 64-bit start em with the following error:
[Root @ localhost ~] # Su-oracle
[Oracle @ localhost ~] $ Emctl start dbconsole
Environment variable ORACLE_UNQNAME not defined. Please set ORACLE_UNQNAME to database unique name.
[Oracle @ localhost ~] $ Export ORACLE_UNQNAME = online
[Oracle @ localhost ~] $ Emctl start dbconsole
Enter the Configuration file in the Configuration file./u01/app/oracle/Solaris/j2ee/OC4J_DBConsole_localhost.localdomain_online not found.
The cause is that the em database is incorrectly configured or dbcontrol is not configured.

1. re-build EM data
[Oracle @ localhost ~] $ Emca-repos recreate

Started emca at Sep 6, 2010 4:42:53
EM Configuration Assistant, Version 11.2.0.0.2 Production
Copyright (c) 2003,200 5, Oracle. All rights reserved.

Enter the following information:
Database SID: online
Listener port number: 1521
Password for SYS user:
Password for SYSMAN user:

Do you wish to continue? [Yes (Y)/no (N)]: y
Sep 6, 2010 4:43:30 oracle. sysman. emcp. EMConfig perform
INFO: This operation is being logged at/u01/export toollogs/emca/online/emca_2010_09_06_16_42_52.log.
Sep 6, 2010 4:43:31 oracle. sysman. emcp. EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while )...
Sep 6, 2010 4:46:23 oracle. sysman. emcp. EMReposConfig invoke
INFO: Repository successfully dropped
Sep 6, 2010 4:46:24 oracle. sysman. emcp. EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while )...
Sep 6, 2010 4:53:00 oracle. sysman. emcp. EMReposConfig invoke
INFO: Repository successfully created
Enterprise Manager configuration completed successfully
Finished emca at Sep 6, 2010 4:53:00

2: Configure dbcontrol
[Oracle @ localhost ~] $ Emca-config dbcontrol db

Started emca at Sep 6, 2010 5:02:57
EM Configuration Assistant, Version 11.2.0.0.2 Production
Copyright (c) 2003,200 5, Oracle. All rights reserved.

Enter the following information:
Database SID: online
Listener port number: 1521
Listener ORACLE_HOME [/u01/app/oracle]:
Password for SYS user:
Password for DBSNMP user:
Password for SYSMAN user:
Password for SYSMAN user: Email address for communications (optional ):
Outgoing Mail (SMTP) server for communications (optional ):
-----------------------------------------------------------------

You have specified the following settings

Database ORACLE_HOME.../u01/app/oracle

Local hostname ......
Listener ORACLE_HOME.../u01/app/oracle
Listener port number... 1521
Database SID ...... online
Email address for communications ...............
Outgoing Mail (SMTP) server for communications ...............

-----------------------------------------------------------------
Do you wish to continue? [Yes (Y)/no (N)]: y
Sep 6, 2010 5:03:34 oracle. sysman. emcp. EMConfig perform
INFO: This operation is being logged at/u01/export toollogs/emca/online/emca_2010_09_06_17_02_56.log.
Sep 6, 2010 5:03:39 oracle. sysman. emcp. EMReposConfig uploadConfigDataToRepository
INFO: Uploading configuration data to EM repository (this may take a while )...
Sep 6, 2010 5:04:45 oracle. sysman. emcp. EMReposConfig invoke
INFO: Uploaded configuration data successfully
Sep 6, 2010 5:04:46 oracle. sysman. emcp. ParamsManager getLocalListener
WARNING: Error retrieving listener for localhost. localdomain
Sep 6, 2010 5:04:49 oracle. sysman. emcp. util. DBControlUtil configureSoftwareLib
INFO: Software library configured successfully.
Sep 6, 2010 5:04:49 oracle. sysman. emcp. EMDBPostConfig configureSoftwareLibrary
INFO: Deploying Provisioning archives...
Sep 6, 2010 5:05:22 oracle. sysman. emcp. EMDBPostConfig configureSoftwareLibrary
INFO: Provisioning archives deployed successfully.
Sep 6, 2010 5:05:22 oracle. sysman. emcp. util. DBControlUtil secureDBConsole
INFO: Securing Database Control (this may take a while )...
Sep 6, 2010 5:06:17 oracle. sysman. emcp. util. DBControlUtil secureDBConsole
INFO: Database Control secured successfully.
Sep 6, 2010 5:06:17 oracle. sysman. emcp. util. DBControlUtil startOMS
INFO: Starting Database Control (this may take a while )...
Sep 6, 2010 5:07:00 oracle. sysman. emcp. EMDBPostConfig configure mconfiguration
INFO: Database Control started successfully
Sep 6, 2010 5:07:00 oracle. sysman. emcp. EMDBPostConfig configure mconfiguration
INFO: >>>>>>>>>> The Database Control URL is https://localhost.localdomain: 1158/em <
Sep 6, 2010 5:07:04 oracle. sysman. emcp. EMDBPostConfig invoke
WARNING:

You can see that em has been started:
[Oracle @ localhost ~] $ Netstat-ntpl | grep 1158
(Not all processes cocould be identified, non-owned process info
Will not be shown, you wowould have to be root to see it all .)
Tcp 0 0: 1158: * LISTEN 11125/java
[Oracle @ localhost ~] $ Emctl status dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.1.0
Copyright (c) 1996,200 9 Oracle Corporation. All rights reserved.
Https://localhost.localdomain: 1158/em/console/aboutApplication
Oracle Enterprise Manager 11g is running.
------------------------------------------------------------------
Logs are generated in directory/u01/app/oracle/localhost. localdomain_online/sysman/log
* *********************** WARNING *************** *********

Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted. The encryption key has

Been placed in the file:/u01/app/oracle/localhost. localdomain_online/sysman/config/emkey. ora. Please ensure this file is

Backed up as the encrypted data will become unusable if this file is lost.

**************************************** *******************
Enterprise Manager configuration completed successfully
Finished emca at Sep 6, 2010 5:07:04

Connection test:

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