An alternative is to drop and recreate the Oracle Enterprise Manager repository. In the operating system prompt proceed as follows:
Drop Enterprise Manager
$ EMCA -deconfig dbcontrol db -repos drop
Create Enterprise Manager
$ EMCA -config dbcontrol db create -repos
Note: Insert the information that is requested. User, SID, etc…
Connect to the Oracle database with SYS user through SQLPLUS
SQL> show parameter control_management_pack_access;
NAME TYPE VALUE
———— —- ———-
control_management_pack_access string NONE
SQL> alter system set control_management_pack_access = ‘DIAGNOSTIC + TUNING’;
Changed system.
SQL> show parameter control_management_pack_access;
NAME TYPE VALUE
———— —- ———-
control_management_pack_access string DIAGNOSTIC + TUNING