Before you create the physical layer of a repository, you need to plan, design,
and then create a repository file.
The Physical layer of the Administration Tool defines the data sources to which the Oracle BI Server submits queries and the relationships between physical databases and other data sources that are used to process multiple data source queries.
The Physical layer of the Administration Tool defines the data sources to which the Oracle BI Server submits queries and the relationships between physical databases and other data sources that are used to process multiple data source queries.