1. Set password for SYS in password file:
orapwd file=$ORACLE_HOME/dbs/orapw<ORACLE_SID>
2. Drop repos data copied from the original database ( you may need to unlock sysman user first ):
emca -deconfig dbcontrol db -repos drop
3. If emca cannot drop user sysman, drop it manually in sqlplus:
DROP USER sysman CASCADE;
4. Create the repos data:
emca -config dbcontrol db -repos create
Create Oracle Enterprise Manager repository data after restore a database from another server
原文：http://www.cnblogs.com/amonw/p/4055682.html