Synchronization Service - Oracle Connections

Hello all,

I am trying to configure Synchronization Service with a connection with an Oracle database in order to update user attributes from the Oracle database.

So I added the "Oracle Database Connector" in Synchronization Service.

I have the following error message:
The specified SQL Server instance cannot be contacted.
Details: ORA-12154: TNS: Could not resolve specified connection identifier
ORA-12154: TNS: Unable to resolve specified connection identifier

I read in the documentation, that it is necessary to install:
Oracle Client.
Oracle Net Services
Oracle Data Provider for .NET

Could someone who has set up the Oracle connector tell me where to find the prerequisites, and how to install them?
I can't find any information ...

Thank you in advance for your help.
Gégé