在oracle用户下，直接输入（前提是先启动listener）

emca -config dbcontrol db -repos recreate

STARTED EMCA at Dec 8, 2012 7:36:37 PM

EM Configuration Assistant, Version 11.2.0.0.2 Production

Copyright (c) 2003, 2005, Oracle.  All rights reserved.

Enter the following information:

Database SID: orcl

Listener port number: 1521

Listener ORACLE_HOME [ /u01/app/oracle/product/10.2.0/db_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/10.2.0/db_1

Local hostname ................ ora10g

Listener ORACLE_HOME ................ /u01/app/oracle/product/10.2.0/db_1

Listener port number ................ 1521

Database SID ................ orcl

Email address for notifications ...............

Outgoing Mail (SMTP) server for notifications ...............

-----------------------------------------------------------------

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

Dec 8, 2012 7:36:53 PM oracle.sysman.emcp.EMConfig perform

INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/orcl/emca_2012_12_08_19_36_36.log.

Dec 8, 2012 7:36:54 PM oracle.sysman.emcp.EMReposConfig invoke

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

Dec 8, 2012 7:36:55 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Repository successfully dropped

Dec 8, 2012 7:36:56 PM oracle.sysman.emcp.EMReposConfig createRepository

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

Dec 8, 2012 7:46:12 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Repository successfully created

Dec 8, 2012 7:46:16 PM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository

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

Dec 8, 2012 7:47:48 PM oracle.sysman.emcp.EMReposConfig invoke

INFO: Uploaded configuration data successfully

Dec 8, 2012 7:47:51 PM oracle.sysman.emcp.util.DBControlUtil configureSoftwareLib

INFO: Software library configured successfully.

Dec 8, 2012 7:47:51 PM oracle.sysman.emcp.EMDBPostConfig configureSoftwareLibrary

INFO: Deploying Provisioning archives ...

Dec 8, 2012 7:48:31 PM oracle.sysman.emcp.EMDBPostConfig configureSoftwareLibrary

INFO: Provisioning archives deployed successfully.

Dec 8, 2012 7:48:31 PM oracle.sysman.emcp.util.DBControlUtil secureDBConsole

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

Dec 8, 2012 7:49:06 PM oracle.sysman.emcp.util.DBControlUtil secureDBConsole

INFO: Database Control secured successfully.

Dec 8, 2012 7:49:06 PM oracle.sysman.emcp.util.DBControlUtil startOMS

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

Dec 8, 2012 7:49:59 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

INFO: Database Control started successfully

Dec 8, 2012 7:49:59 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration

INFO: >>>>>>>>>>> The Database Control URL is https://ora10g:1158/em <<<<<<<<<<<
Dec 8, 2012 7:50:03 PM oracle.sysman.emcp.EMDBPostConfig invoke

WARNING:

************************  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/product/10.2.0/db_1/ora10g_orcl/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 Dec 8, 2012 7:50:03 PM

到这里就算成功了

然后可以启动OEM了

emctl start dbconsole