[oracle@db11gr2 config]$ $ORACLE_HOME/bin/emca -deconfig dbcontrol db -repos drop
STARTED EMCA at Feb 10, 2013 4:59:04 PM
EM Configuration Assistant, Version 11.2.0.0.2 Production
Copyright (c) 2003, 2005, Oracle. All rights reserved.
Enter the following information:
Database SID: DB11G
Listener port number: 1521
Password for SYS user:
Password for SYSMAN user:
Do you wish to continue? [yes(Y)/no(N)]: y
Feb 10, 2013 4:59:24 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/DB11G/emca_2013_02_10_16_59_04.log.
Feb 10, 2013 4:59:24 PM oracle.sysman.emcp.util.DBControlUtil stopOMS
INFO: Stopping Database Control (this may take a while) …
Feb 10, 2013 4:59:54 PM oracle.sysman.emcp.ParamsManager checkListenerStatusForDBControl
WARNING: Error initializing SQL connection. SQL operations cannot be performed
Feb 10, 2013 4:59:54 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) …
Feb 10, 2013 5:15:12 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Enterprise Manager configuration completed successfully
FINISHED EMCA at Feb 10, 2013 5:15:18 PM
[oracle@db11gr2 config]$