Step 1 : Click on "+" button on connect page to create a new connection.

Step 2 : Click on "Oracle" from Relational Database Management System section from list of datasources

Step 3: Provide required details listed below to connect to Oracle. Click on validate to test the connection.
- 
Datasource Name - name for the data source connection you want to give
 - Datasource Tags - Tags you wish to associate with respective datasource
 - Hostname or IP - ip address of Oracle
 - Port - port to connect to Oracle
 - Username - username of Oracle user 
 - Password -  password of Oracle user
 - Database - The name of oracle dbname
 - Save Connection Details - Select checkbox to Save the connection details for future usage
 

Step 4: You will redirected on preview screen if connected successfully to Oracle. You can then choose relevant database and tablename to see the preview of the data