Datasource Name represents the location of OPS SQL data on an OPS SQL Database Server.
It can mean two different things, depending on the Database Backend that you are running:

1. For Oracle , datasource name is the TNS name that connects you to the Oracle Database hosting the OPS SQL Database Server
2. For Microsoft SQL, datasource name consists of name of the machine running Microsoft SQL Server software hosting the OPS SQL Database Server.
   It is sometimes followed by the name of the Microsoft SQL Server instance. In that case it will like like this : Servername\Instancename