Whar are logical table, Physical table Logical data Source

Hi,
Can any one explain me in details what Whar are logical table, Physical table Logical data Source.
Any qucik help will be graetly appreciated

In OBI there are three layers - Physical, Business Model and Mapping (BMM) and Presentation.
As the name specifies the Physical layer mainly contain physical aspect of the application like which connection to use, which schema (also catalog in case of SQL server) to connect and also which table to use. This layer confirms the PK_FK joins for the related tables. This layer mainly depicts how the data has been stored in the database layer.
On top of this layer you will have you BMM layer. The place where all work of a developer starts. You will structure the tables accourding to the business need. The structure has to be a STAR schema. All the entities in this layer are called logical because they do not directly represent any database object rather they provides a logical mapping to the database entities. This becomes clear when you use more that one Logical Table Source (LTS) for your logical tables. One logical column can map to N number of physical columns based on context. You can also create calculative columns in this layer which are totaly logical in nature.
I am not writing anything on Presentation layer as it is not in you question. :)
Hope this will help.
Regards,
Somnath

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hi
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Hi
Here a few links on the topic..
/thread/101086 [original link is broken]
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Whar are logical table, Physical table Logical data Source

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