Réponse acceptée !
apres tu dois efface l'ancien configuration
emca -deconfig dbcontrol db
eliminè le catalog
EXEC sysman.emd_maintenance.remove_em_dbms_jobs;
EXEC sysman.setEMUserContext('',5);
REVOKE dba FROM sysman;
DROP USER mgmt_view CASCADE;
DROP ROLE mgmt_user;
DROP USER sysman CASCADE;
drop public synonym MGMT_TARGET_BLACKOUTS;
drop public synonym SETEMVIEWUSERCONTEXT;
emca -deconfig dbcontrol db -repos drop
ensuite recree la dbconsole
emca -config dbcontrol db -repos create
désolé pour mon francais