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Steps to remove “DATABASE SYSTEM” target from OEM 12C

The issue is after removing all the targets from a host ,
database system targets still appears in the oem.

So We have to remove this manually using EMCLI command for
deleting this database system targets

Login to oem database and use the below query to find the
target

select
target_name, target_type from sysman.mgmt_targets where target_name like
‘%test%’;

TEST_RACNODE1                                                        
oracle_database

TEST_RACNODE1_sys                                                  oracle_dbsys

emcli
delete_target -name=”TEST_RACNODE1″ -type=”oracle_database”

emcli
delete_target -name=”TEST_RACNODE1_sys”
-type=”oracle_dbsys”

Now check again,

select target_name, target_type from sysman.mgmt_targets
where target_name like ‘%test%’;

no rows selected.

Hope this helps …