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select in rule routine or start routine which one is best for performance..


I see code written by others where,

1. a start routine has select statement and fills up an internal table and that is looked (READ TABLE) in the rule routine for an field in the DSO.

2. a rule routine where the select statement is written do read the data from another DSO

I guess the latter will affect the performance during the transformation and I feel reading the required data into an internal table in start routine and then in the rule routine reading the internal table will be comparitively faster.

Is my understanding right ? Is there any other best practise or suggestion to maintain / improve performance , when reading data from other DSOs in the transformation ?


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