The minimum permissions for Oracle User are as follow:
Reference: Page 18 -19 of the eB Implementation Guide.
When installing the Oracle client on the eB Application Server computer, the components to be installed exist within the Oracle Windows Interfaces section. Although eB predominantly makes use of the Oracle Data Provider for .NET (ODP.NET) components, all components within the Oracle Windows Interfaces section should be installed:
As with all Oracle databases, you will need to add an entry in the tnsnames.ora to connect, so, when installing the Oracle client, install the Oracle Net components.
For detail Oracle setup information for eB, please refer to the eBimplementationGuide.pdf (eB Implementation Guide, Database Setup section) that comes with the version of eB in use.