Not able to connect to Oracle DB

Hi Expert,

We have our SLT installed on BW server, We are trying to connect to Oracle DB using RFC Connection,

Is it the right process,

1) Do we need Oracle client on BW server?

2) Should we maintain TNS values on BW server?

3) Should we use sm59 or dbacockpit to establish connection please guide us we dont have BASIS guys with us.

Couldnt find in any site complete details, as what values goes in dbconnection settings

Thanks & Regards,

Sukanta