How sap application connect oracle database

The gurus,
I just to known how sap application connect to oracle database. Where or what the configuration files at SAP level and oracle level.
Thank you
Edited by: Muzaidi Marjuki on Apr 28, 2011 8:58 AM

existing database to other database that also running on oracle ( right now we testing for recovery server) in case the existing server going down or have a problem that cannot been restore
Its similar to DR setup, then why don't you install application at time of initial installation of DR?
*Explain in detial with a clear query
Regards,
Nick Loy

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