Extracting data from Legacy system - How do we get the data into a normaliz

Hi All,
Requirement that I have now is to get the data from 6 different tables ORACLE database to BI using DB Connect, where in each of those 6 tables has the transactional data as well - If it is only 2 tables, would have been creating a view and get the data. Each of the 6 tables are linked to one other by the Primary Key and Foreign key relation ship.
If it is from ERP system we would have created a Functional Module.
Please advice me on how to get the data to BI end from those tables in Legacy system.
Thanks in advance.

Anil:
I recommend following Ralph Kimball's EDW data modeling principles.
Have a staging layer of DSO's with data dump from source system. So have 6 different DSO's extracting data from 6 tables from source system independently.
Then have an integeration layer of DSO's depending on requirement. You could combine data from 2 or more DSO's here based on requirement and integrate your data here. Use primary key foreign key relationships here to do look ups or direct loads to do your business logic.
Then have an analytical layer of InfoCubes, MultiProviders, InfoSets as required.
The 3 layered architecture is a standard best practice that i have seen followed in many organizations. You could search for this type of architecture online under EDW (Enterprise Data Warehouse). There should be plenty of information available.
Good Luck.
MP.

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