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RE:[sap-dev] Performance Tuning - Modifying internal table inside a loop

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Posted by DakilangAbaper
on Sep 12 at 9:42 AM 		Mark this reply as helpfulMark as helpful
Thanks to all of you guys... All of your answers helped me a lot in understanding the performance difference of the 2.

I've got a follow up question by the way. Isn't we create index for tables to improve the performance. Will it also be a help if we are simply selecting all data from a table?

What I mean is NO WHERE condition, just a simple SELECT * FROM mara TO TABLE itab... Is making an index to table MARA will still be a help to improve the selection performance?

---------------Original Message---------------
From: Super_Abaper
Sent: Wednesday, September 08, 2010 12:50 PM
Subject: Performance Tuning - Modifying internal table inside a loop

> Hi gurus,
>
> Just like to ask, which one performs faster in modifying an internal table inside a loop statement.
> Is it with the MODIFY i_tab INDEX sy-tabix (inside the loop) or you assign it to a field-symbols.
> (1) LOOP AT i_tab.
> i_tab-f1 = 123.
> MODIFY i_tab INDEX sy-tabix.
> ENDLOOP.
>
> OR
>
> (2)
> LOOP AT i_tab ASSIGNING <fs1>.
> ASSIGN COMPONENT 'F1' OF STRUCTURE <fs1> TO <fs>.
> <fs> = 123.
> ENDLOOP.
>
> Also, how can I trace the duration of a program. How can I evaluate it in ST05, or is there any other way.
>
> Thanks a lot!

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