Reinstall & Secure the Database Control

To secure the Database Control execute the following command(s):

1) Set the environment variable ORACLE_SID to the your oracle_sid(example: ORCL).
2) /opt/app/oracle/product/10.2.0/db_1/bin/emctl stop dbconsole
3) /opt/app/oracle/product/10.2.0/db_1/bin/emctl config emkey -repos -sysman_pwd <Password for sysman user>
4) /opt/app/oracle/product/10.2.0/db_1/bin/emctl secure dbconsole -sysman_pwd <Password for sysman user>
5) /opt/app/oracle/product/10.2.0/db_1/bin/emctl start dbconsole

To secure Em Key, run /opt/app/oracle/product/10.2.0/db_1/bin/emctl config emkey -remove_from_repos -sysman_pwd <Password for sysman user>

To recreate/reinstall EM database control
1) emca -config dbcontrol db -repos recreate