Oracle Discoverer Database access

When I install Discoverer, it creates an Oracle database as part of the installation process. Is this the only database that this installation can access? Does this mean that all my reporting data should be migrated to this new database?
What would I need to do in-order to get this instance of Discoverer extract reports from an Oracle Data Warehouse?
Thanks in advance.

A few clarifications are in order:
Firstly, Discoverer does not install any Oracle database. The database that you see is the infrastructure database and Discoverer uses that to store Discoverer portlets and other connection information.
Secondly, this database installation itself is an optional part. If you install Oracle Business Intelligence standalone then you do not need to have this database.
Thirdly, Discoverer can access any Oracle or non-Oracle database (via the HDS option), not just the infrastructure database.
Also, I would strongly urge you to take a look at the Discoverer documentation library, available online at http://download-uk.oracle.com/docs/cd/B14099_18/bi.htm.
In particular, take a look at the Oracle Business Intelligence Concepts Guide (http://download-uk.oracle.com/docs/cd/B14099_18/bi.1012/b16378/toc.htm) and the Discoverer Configuration Guide (http://download-uk.oracle.com/docs/cd/B14099_18/bi.1012/b13918/toc.htm)
Thanks
Abhinav
Oracle Business Intelligence Product Management
BI on Oracle: http://www.oracle.com/bi/
BI on OTN: http://www.oracle.com/technology/products/bi/
Documentation: http://docs.oracle.com/
Discoverer: http://www.oracle.com/technology/products/discoverer/
BI Software: http://www.oracle.com/technology/software/products/ias/devuse.html
BI Samples: http://www.oracle.com/technology/products/bi/samples/
BI Blog: http://oraclebi.blogspot.com/
Blogs: http://blogs.oracle.com/

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