performance query

Hi folks

I have the below code and i am getting performance issue on below code.

Please suggest

      SELECT bukrs belnr gjahr xblnr awkey FROM bkpf INTO
*       TABLE it_bkpf FOR ALL ENTRIES IN it_vbrk WHERE xblnr = it_vbrk-xblnr.
      TABLE it_bkpf FOR ALL ENTRIES IN it_vbrk
                    WHERE bukrs = it_vbrk-bukrs AND
                          XBLNR = it_vbrk-xblnr and
                          awkey = it_vbrk-awkey.

it is taking 2 min to excecute this code and some times if data is high it is taking much time and going on dump not able to resolve it.

Please suggest.

Regards

Ravi