Decision to Build BW data model with legacy data

Hi experts,
I was assigned a task to take decision on creating new data warehouse on the following scenario's
Option1:
1.SAP BW + Legacy data( Separate database)
Option2:
2.SAP BW+ Legacy data integrate to BW.
Please let me the pros and cons involved in integrating legacy data to BW or to report separately as two different data bases using BOBJ.Client is having SAP R/3 EEC6.0 running.SAP data is around 60% and remaining is legacy.
My question is which option is better with some detail.
Regards
prasad

Hi Prasad,
As mentioned no need to combine Legasy data and BW data in BOBJ.You can directly extract to BI from R/3 and Legasy Data.But
Please check the folliwng points from DB People.
1. As per requirement how many Tables that you are using to extract the data?
2. You have three source tables.But there are no unique records.In this case first you need to identify the common key field.
Note : That key field also should same as in R/3 also.
Based on the three source tables inform the DB team Mainatain a separate table (Which should collect only common record from three tables).
3. Now you can load the data into BI.So the above scenario will resolve issue.
Issues & Concern :
1. If yopu extract Lagasy and BI to BOBJ ?How u r going to combine data in BOBJ to generate a global report.
2. Is this possible to maintain a separate table in DB by the DB team.
Check once with DB team before proceeding further.
Regards
Ram.

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