Routine,delta upload

Hi experts,
i am new to bw and sdn .
can u answer for my questions ,i was asked in my interview.
1)what is the scenario of start routine?
2)how to generate a report for present year and previous three years?
3)what is the mechanism behind  delta upload?
thanks in advance
regards
krisna

Hi Krishna,
1) Start Routine - Start routine is executed prior to executing of transfer rules, so if there is any global variable to be used in all transfer rules then it is better to declare that in start routine.
After start routine execution is over then transfer rules r executed.
Start routine are at two levels
1. update roule
2. transfer rules
start routine is processed once per data package load .For ex : you want to eliminate a set of records based on dome criteria you can do that with start routine . But update rules or transfer rules are processed once per data record where you can manipulate each single record .
There is an internal table called data_package which will have all the data available for processing you can later store all the data in another internal table (you can declare) which can later be used in update rules .
3) Delta Upload Mechanism - Regarding the Delta upload mechanism, it's simply the mechanism that helps updating only the changed data, and not the full update. The field 0RECORDMODE determines whether the records are added to or overwritten. It determines how a record is updated in the delta process: A blank character signifies an after image, ‘X’ a before image, ‘D’ deletes the record and ‘R’ means a reverse image.
You can check following link for details.
http://help.sap.com/saphelp_erp2004/helpdata/en/e3/e60138fede083de10000009b38f8cf/frameset.htm
Regards,
Ashish.

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