SQL> desc user_track;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 EID                                                NUMBER
 ENAME                                              VARCHAR2(15)
 OLD_PERKS                                          NUMBER
 NEW_PERKS                                          NUMBER
 UNAME                                              VARCHAR2(15)
 ACTION_DATE                                        DATE
 ACTION_TIME                                        DATE

SQL> create or replace trigger tri_track
  2  After UPDATE ON EMP
  3  FOR EACH ROW
  4  BEGIN
  5  insert into user_track(EID,ENAME,OLD_PERKS,NEW_PERKS ,UNAME,ACTION_DATE,ACTION_TME) values
  6  (:old.eid, :old.ename , :old.perks, :new.perks,user, sysdate, to_char(sysdate , 'HH24:MI:SS')
  7  from dual;
  8  end;
  9  /

Warning: Trigger created with compilation errors.

SQL> show errors;
Errors for TRIGGER TRI_TRACK:

LINE/COL ERROR
-------- -----------------------------------------------------------------
2/1      PL/SQL: SQL Statement ignored
3/95     PL/SQL: ORA-00917: missing comma

SQL> create or replace trigger tri_track
  2  After UPDATE ON EMP
  3  FOR EACH ROW
  4  BEGIN
  5  insert into user_track values(:old.eid, :old.ename , :old.perks, :new.perks,
  6  user, sysdate);
  7  end;
  8  /

Trigger created.

SQL> select * From user_track;

       EID ENAME            OLD_PERKS  NEW_PERKS UNAME           ACTION_DA
---------- --------------- ---------- ---------- --------------- ---------
         1 RED                    990        940 HR              25-JUN-13
         1 RED                    940        940 HR              25-JUN-13

create or replace trigger tri_track
  2  After UPDATE ON EMP
  3  FOR EACH ROW
  4  BEGIN
  5   insert into user_track(EID,ENAME,OLD_PERKS,NEW_PERKS ,UNAME,ACTION_DATE,ACTION_TIME)
  6  values
  7  (:old.eid, :old.ename , :old.perks, :new.perks,user, sysdate, to_char(sysdate, 'HH24:MI:SS'));
  8  end;
  9  /

Trigger created.