Accelerated LOOP

Using "LOOP AT itab ASSIGNING ." instead of using a work area (either explicit or via header line) you avoid data transport into the work area. The field symbol is a pointer into(!) the table so that you can modify the table line directly; you don't need MODIFY thus avoiding another data transport.
report z.
types: begin of rec_type,
       count type i,
       string(1024) type c,
       end   of rec_type.
types  tab_type type rec_type occurs 0.
data   itab type tab_type.
data   wa   type rec_type.
field-symbols  type rec_type.
do 1000 times.
   append wa to itab.
loop at itab assigning . " pointer
   -count = sy-tabix. " modify itab
   -string = 'x'. " without MODIFY

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This was first published in December 2001

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