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If you want to start the OEM service of Oracle and run emctl start dbconsole, the error message appears as follows:

/ u01/app/oracle/product/11.2.0/dbhome_1/oc4j/j2ee/OC4J_DBConsole_wjq.comsys.com_OraDB11g not found . To open OEM's web hypervisor, you must first start Database listener, and then start the Datebase Control port monitor, but encounter the following problems:

[oracle@wjq ~] $emctl start dbconsole

OC4J Configuration issue. / u01/app/oracle/product/11.2.0/dbhome_1/oc4j/j2ee/OC4J_DBConsole_wjq.comsys.com_OraDB11g not found.

In fact, such a situation may be that the em database is not configured correctly or that dbcotrol is not configured properly.

Solution:

Reconstruction of em data by ①

[oracle@wjq ~] $emca-repos recreate

STARTED EMCA at Nov 3, 2017 4:35:17 PM

EM Configuration Assistant, Version 11.2.0.3.0 Production

Copyright (c) 2003, 2011, Oracle. All rights reserved.

Enter the following information:

Database SID: seiang11g

Listener port number: 1521

Password for SYS user:

Password for SYSMAN user:

WARNING: While repository is dropped the database will be put in quiesce mode.

Do you wish to continue? [yes (Y) / no (N)]: y

Nov 3, 2017 4:35:34 PM oracle.sysman.emcp.EMConfig perform

INFO: This operation is being logged at / u01/app/oracle/cfgtoollogs/emca/OraDB11g/emca_2017_11_03_16_35_16.log.

Nov 3, 2017 4:35:34 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Dropping the EM repository (this may take a while)...

Nov 3, 2017 4:36:47 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Repository successfully dropped

Nov 3, 2017 4:36:47 PM oracle.sysman.emcp.EMReposConfig createRepository

INFO: Creating the EM repository (this may take a while)...

Nov 3, 2017 4:40:32 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Repository successfully created

Enterprise Manager configuration completed successfully

FINISHED EMCA at Nov 3, 2017 4:40:32 PM

② configuration dbcontrol

[oracle@wjq ~] $emca-config dbcontrol db

STARTED EMCA at Nov 3, 2017 2:29:41 PM

EM Configuration Assistant, Version 11.2.0.3.0 Production

Copyright (c) 2003, 2011, Oracle. All rights reserved.

Enter the following information:

Database SID: seiang11g

Listener port number: 1521

Listener ORACLE_HOME [/ u01/app/oracle/product/11.2.0/dbhome_1]:

Password for SYS user:

Password for DBSNMP user:

Password for SYSMAN user:

Email address for notifications (optional):

Outgoing Mail (SMTP) server for notifications (optional):

-

You have specified the following settings

Database ORACLE_HOME. / u01/app/oracle/product/11.2.0/dbhome_1

Local hostname. Wjq.comsys.com

Listener ORACLE_HOME. / u01/app/oracle/product/11.2.0/dbhome_1

Listener port number. 1521

Database SID. Seiang11g

Email address for notifications.

Outgoing Mail (SMTP) server for notifications.

-

Do you wish to continue? [yes (Y) / no (N)]: y ^ H

Nov 3, 2017 2:30:36 PM oracle.sysman.emcp.EMConfig perform

INFO: This operation is being logged at / u01/app/oracle/cfgtoollogs/emca/OraDB11g/emca_2017_11_03_14_29_40.log.

Nov 3, 2017 2:30:39 PM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository

INFO: Uploading configuration data to EM repository (this may take a while)...

Nov 3, 2017 2:32:36 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Uploaded configuration data successfully

Nov 3, 2017 2:32:38 PM oracle.sysman.emcp.util.DBControlUtil secureDBConsole

INFO: Securing Database Control (this may take a while)...

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.util.PlatformInterface executeCommand

WARNING: Error executing / u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl secure dbconsole-host wjq.comsys.com-sid OraDB11g

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

WARNING: Error securing Database control.

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.EMDBPostConfig setWarnMsg

INFO: Error securing Database Control. Database Control has been brought-up in non-secure mode. To secure the Database Control execute the following command (s):

1) Set the environment variable ORACLE_UNQNAME to Database unique name

2) / u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl stop dbconsole

3) / u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl config emkey-repos-sysman_pwd

4) / u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl secure dbconsole-sysman_pwd

5) / u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl start dbconsole

To secure Em Key, run / u01/app/oracle/product/11.2.0/dbhome_1/bin/emctl config emkey-remove_from_repos-sysman_pwd

Nov 3, 2017 2:32:53 PM oracle.sysman.emcp.util.DBControlUtil startOMS

INFO: Starting Database Control (this may take a while)...

Nov 3, 2017 2:32:58 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

INFO: Database Control started successfully

Nov 3, 2017 2:32:58 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

INFO: > The Database Control URL is http://wjq.comsys.com:5500/em

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