Performance wise: CMOD or dividing the queries.

Dear Friends,
I have a performance related question.
We need to develop a report in which Sum of top 5 materials based on delivery quantity has to be displayed monthwise.
Eg: If in January Materials M1 M2 M5 M6 M7 are top 5 in delivery quantity, then the sum of their delivery quantity.
If in Feb Materials M2 M3 M5 M8 M9 are top 5 in delivery quantity, then the sum of their delivery quantity.
and so on till December.
I thought of using condition TOP N on delivery quantity in Bex query. (Pls correct me if i am wrong)
Problem: Top N will work only for one month in a single query. It cant work for different month (different top 5 materials)
Solution Proposed:
1. Make 12 different queries, one for each month (using Top N) and put each result in a workbook.
2. 12 different cmod variables and cmod code picksup top 5 materials for each month and put in each variables of respective months. Restrict using these cmod variables for respective columns.
So I wanted your valuable suggestions which of the above method will be of good performance (considering maintenance, etc factors) and the reason also.
Approximate number of records 1 lakh per year.
Kindly give ur suggestions.
Thanks,
Guru
Edited by: hi2guru on Nov 17, 2010 5:21 AM
Edited by: hi2guru on Nov 17, 2010 5:55 AM

Hi
Interesting situation !!!
I think writing 12 queries is not a good idea. For a simple reason that you will have either run a Query at a time (with a different input for each of this) .. isnt it ?
Creating variables for each of the month would be a good idea. You could generate value of 11 months based on a single input from the user. Moreover, the user can give any input ...say for eg the input is 11.2010 then through the customer exit you could find values for the past 11 months. Similarly even if the user changes the input value (say to 08.2010) the system can easily calculate the previous 11 months thus giving you the desired output.
Cheers
Umesh

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