Performance problem with DFKKOP even after using Index fields

Hello Everyone,

I am using the fields VKONT, BUKRS, BUDAT to hit DFKKOP.

I tried using PACKAGE SIZE method and PACKAGE SIZE along with OPEN CURSOR method. Also I verified in ST05 that the query is making use of an index designed for "BUKRS and BUDAT".

However, the query in all cases is taking a huge amount of time and the report never gets past this statement.

    OPEN CURSOR WITH HOLD cursor FOR SELECT vkont hvorg tvorg budat FROM dfkkop

                                     FOR ALL ENTRIES IN it_unqca

                                     WHERE bukrs = c_ui01

                                     AND vkont = it_unqca-vkont

                                     AND budat BETWEEN v_6mstartdate AND sy-datum.

    DO.

      FETCH NEXT CURSOR cursor APPENDING TABLE it_lp PACKAGE SIZE c_5000.

      IF sy-subrc NE 0.

        EXIT.

      ENDIF.

      CALL FUNCTION 'DB_COMMIT'.

    ENDDO.

    CLOSE CURSOR cursor.

Could anyone suggest a way to overcome this performance issue? Any suggestion will be helpful.

I searched SDN and nothing seems to satisfy this question. ( Performance issue after using index)

Thanks,

Sam