Select query with primary key on RESB taking too long

Question

Hello All,
The below Select query is taking about 1 Hour to run on production. I have done some analysis and the correct index is being selected.
The query is :
IF it_aufnr[] IS NOT INITIAL.                             
    SELECT rsnum
           rspos
           matnr
           werks
        lgort
           shkzg
           aufnr
           bdmng
           enmng                      
           FROM  resb INTO  TABLE it_rsnum FOR ALL ENTRIES IN it_aufnr
           WHERE rsnum EQ it_aufnr-rsnum
           AND   xloek NE 'X'
           AND   postp NE 'X'
           AND   resb~bdmng GE resb~enmng.
  ENDIF.
Database Table RESB: 40,000,000 Records (40 Million)
Internal Table   it_aufnr:  20,000 Entries
Entries selected from RESB: 150,000.
Any ideas on how I could improve the performance ?
Thanks,
Shruthi

Answer 1

>     SELECT rsnum
>            rspos
>            matnr
>            werks
>         lgort
>            shkzg
>            aufnr
>            bdmng
>            enmng                      
>            FROM  resb INTO  TABLE it_rsnum FOR ALL ENTRIES IN it_aufnr
>            WHERE rsnum EQ it_aufnr-rsnum
>            AND   xloek NE 'X'
>            AND   postp NE 'X'
>            AND   resbbdmng GE resbenmng.
>   ENDIF.
>
> Database Table RESB: 40,000,000 Records (40 Million)
> Internal Table   it_aufnr:  20,000 Entries
> Entries selected from RESB: 150,000.
>
Hi,
the problem is the big for all entries table.
Your 20.000 records FAE will be split into SEVERAL sql statements depending on the size of the table.
Where do you get the it_auftrn from?
If it's another transparent table try to JOIN this table to your big table.
SELECT rsnum
            rspos
            matnr
            werks
        lgort
            shkzg
            aufnr
            bdmng
            enmng                      
            FROM  resb JOIN tab_auftrn  on  resbrsnum = tab_auftrnauftrn
            AND   xloek NE 'X'
            AND   postp NE 'X'
            AND   resbbdmng GE resbenmng.
Make sure that your WHERE filter and the JOIN keys on both tables are supported by indexes.
150.000 records about of 40 Mio. can definitly be serviced by an appropriate index:
i.e. Index fields (check your PK or secondary indexes):
rsnum
enmng                      
aufnr
bye
yk