[Performance Tuning] Select from QMEL

Question

Hi experts,
I have a problem with regards with the select from QMEL table, it takes too long to execute. Your input is very much appreciated.
  IF i_sales_orders[] IS NOT INITIAL.
    SELECT qmnum
           vbeln
      FROM viqmel
      INTO TABLE i_viqmel
       FOR ALL ENTRIES IN i_sales_orders
     WHERE vbeln EQ i_sales_orders-vbeln.
  ENDIF.
Regard,
Ng

Answer 1

Table QMEL appears to have an index by cuatomer/sales org/distrib channel/division/...etc  (index MCK).
If what you are looking for is sales order data, then you should be able to read these fields from VBAK into your i_sales_order internal table first (primary key - should be quick), and then read a smaller volume of data from QMEL:
IF i_sales_orders[] IS NOT INITIAL.
SELECT qmnum
vbeln
FROM qmel
INTO TABLE i_viqmel
FOR ALL ENTRIES IN i_sales_orders
WHERE kumun = i_sales_orders-kunnr
AND vkorg = i_sales_orders-vkorg
AND vtweg = i_sales_orders-vtweg
AND spart = i_sales_orders-spart 
AND vbeln EQ i_sales_orders-vbeln.
ENDIF.