DBControl Configuration in 10g

Reconfigure DBControl Configuration Files Without Losing The Repository Data :
$ORACLE_HOME/bin/emca -deconfig dbcontrol db
$ORACLE_HOME/bin/emca -config dbcontrol db

Recreating DB Control with Losing the Repository Data:
$ORACLE_HOME/bin/emca -deconfig dbcontrol db -repos drop
$ORACLE_HOME/bin/emca -config dbcontrol db -repos create

To stop & start the Database Control service run:
$ORACLE_HOME/bin/emctl stop dbconsole
$ORACLE_HOME/bin/emctl start dbconsole

A complete list of available emctl commands can be obtained by just typing:
ORACLE_HOME/bin/emctl