1.删除EM
exportORACLE_HOSTNAME=xxxxxxx
emca -deconfig dbcontrol db -repos drop
2.再次确定彻底删除
drop user SYSMAN cascade;
drop user MGMT_VIEW cascade;
drop role MGMT_USER;
drop public synonym MGMT_TARGET_BLACKOUTS;
drop public synonym SETEMVIEWUSERCONTEXT;
3.重建EM
exportORACLE_HOSTNAME=xxxxxxx
emca -config dbcontrol db -repos create
4.start em
emctl start dbconsole