ORA_GRANTEE returns the number of elements in the list indexed by a PLS_INTEGER datatype.
SQL> SQL> SQL> DECLARE 2 user_list DBMS_STANDARD.ORA_NAME_LIST_T; 3 counter PLS_INTEGER; 4 BEGIN 5 IF ora_sysevent = 'GRANT' THEN 6 counter := ora_grantee(user_list); 7 dbms_output.put_line('counter:'||counter); 8 9 END IF; 10 END; 11 / PL/SQL procedure successfully completed. SQL> SQL>