Re: Performance: The optimal way to change the content of internal table

Thanks guys, let me specify the question with some example.

Let say I have an internal table, where one of the columns is a language, e.g. «EN-US», «EN-CA», «FR-CA» etc., now I want to replace all language values from «EN-US» to «EN-GB».

I can do it with:

1. LOOP AT itab ASSIGNING<wa>.
2.         IF<wa>-lang ='EN-US'.
3.                 <wa>-lang ='EN-GB'.
4.         ENDIF.
5. ENDLOOP.

or with:

1. wa-lang ='EN-GB'.
2. MODIFY itab FROM wa TRANSPORTING lang WHERE lang ='EN-US'.

My question, what is the optimal approach from performance point of view to implement such logic for case with long and short itabs.

In some places I heard, that the second one is better, but I would like to get some theoretically supported explanation.

Thanks.