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During some tests with a huge amount of data a a colleague of me Dirk Freundel gets unexpected performance finding between:

  1. MOVE-CORRESPONDING struc1 TO struc2

  2. MOVE-CORRESPONDING itab1 TO itab2


He put 1.000.000 lines of a table with 27 columns into a internal table with 16 columns. Variant 1 needed about 179 ms less time than variant 2.



Test code:
DO 10 TIMES.

* Init
FREE lt_middle.

* Runtime
GET RUN TIME FIELD lv_runtime_a.

* LOOP
LOOP AT lt_database ASSIGNING <fs_database>.

MOVE-CORRESPONDING <fs_database> TO ls_middle.
INSERT ls_middle INTO TABLE lt_middle.

ENDLOOP.

* OR TABLE
"MOVE-CORRESPONDING lt_database TO lt_middle.

* Runtime
GET RUN TIME FIELD lv_runtime_b.
lv_runtime_b = ( lv_runtime_b - lv_runtime_a ) / 1000.
WRITE: / SY-INDEX, ' Runtime [msec]: ', lv_runtime_b.

ENDDO.

Has anybody else observed the same performance finding, Please add a comment.

 
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