12.2 DBMS_ILM heatmap ado issues

I am testing automatic data optimization polices using dbms_ilm. So I pick a single table in my database and do this:

ALTER TABLE ALERT_CMPZAUFA18A_7_8

ILM ADD POLICY ROW STORE COMPRESS ADVANCED SEGMENT

      AFTER 3 MONTHS OF NO ACCESS;

     

ALTER TABLE ALERT_CMPZAUFA18A_7_8

ILM ADD POLICY TIER TO URET;

/*

  Create a task and execute it, return the task_id

*/

variable taskId NUMBER;

begin

DBMS_ILM.EXECUTE_ILM ( owner               =>   'URET01',

   object_name         =>   'ALERT_CMPZAUFA18A_7_8',

   task_id             =>   :taskId,

   subobject_name      =>   NULL,

   policy_name         =>   DBMS_ILM.ILM_ALL_POLICIES,

   execution_mode      =>   DBMS_ILM.ILM_EXECUTION_ONLINE);

end;

/

print :taskId;