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ABAP Tutorials -
Performance tips and tricks
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Written by mastram
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Saturday, 05 July 2008 06:06 |
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Always use the tools given by ABAP Kernel to do the array operations like appending, inserting deleting duplicates etc. Using your own code to achieve the same functionality will be much slower as compared to ABAP Kernel. Thus, you can improve the performance of your ABAP program to much extent. Here are some examples: PS: Run time given in the examples is approximate run time in micro seconds. Appending tables With the APPEND variant "APPEND LINES OF itab1 TO itab2" the task of appending a table to another table can be transferred to the kernel. Using your algorithm RT: 400
| Using ABAP Kernel RT: 80
| LOOP AT ITAB1 INTO WA.
APPEND WA TO ITAB2.
ENDLOOP.
| APPEND LINES OF ITAB1 TO ITAB2.
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Inserting tables With the INSERT variant "INSERT LINES OF itab1 INTO itab2 INDEX idx" the task of inserting a table into another table can be transferred to the kernel. Using your algorithm RT: 750
| Using ABAP Kernel RT: 80
| I = 250.
LOOP AT ITAB1 INTO WA.
INSERT WA INTO ITAB2 INDEX I.
ADD 1 TO I.
ENDLOOP.
| I = 250.
INSERT LINES OF ITAB1 INTO ITAB2
INDEX I.
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Deleting lines from table Using your algorithm RT: 500
| Using ABAP Kernel RT: 80
| DO 101 TIMES.
DELETE ITAB INDEX 450.
ENDDO.
| DELETE ITAB FROM 450 TO 550.
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Deleting duplicates With the DELETE variant "DELETE ADJACENT DUPLICATES" the task of deleting duplicate entries can be transferred to the kernel. Using conventional algorithm RT:550
| Using ABAP Kernel RT: 70
| READ TABLE ITAB INDEX 1 INTO PREV_LINE.
LOOP AT ITAB FROM 2 INTO WA.
IF WA = PREV_LINE.
DELETE ITAB.
ELSE.
PREV_LINE = WA.
ENDIF.
ENDLOOP.
| DELETE ADJACENT DUPLICATES FROM ITAB
COMPARING K.
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Last Updated ( Thursday, 21 August 2008 14:44 )
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ABAP Tutorials 
