Native SQL to an external oracle database

Hello experts,
     I like to read some data from an external oracle database with native sql statements.
Which prerequisites are neccessary to do so?
In detail: which customizing must be performed?
Wich authorizations are necessary on the local SAP-system and on the oracle-site?
Many thanks for your help!
         Best regards
                            Elmar

first, you need the SAP database library for Oracle. on Windows, filename is dboraslib.dll
then, you create a user ID on your external database
then ,you configure table DBCON
read:
https://forums.sdn.sap.com/click.jspa?searchID=9272762&messageID=1193314
https://forums.sdn.sap.com/click.jspa?searchID=9272762&messageID=2806510

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