Once a database is connected, adding another database is a breeze. Admins can add new databases to the account to analyze even more data.
To access the database settings, click on the "Settings" gear icon at the bottom of the sidebar:
In the database page that opens, click Add Database in the top right:
From there, fill out the information for the database and click Submit. To connect a salesforce instance see documentation on the Salesforce datasource.
To connect a database via a SSH tunnel, click the Connect to a Private Network link at the bottom right.
Once Submitted, the database will be connected automatically and queries can be ran off of it right away.
Access database settings as described above for adding a database
From there, click on the Disconnect button seen in the bottom right of the database page.
Clicking on the button would lead to a Disconnect Database pop-up. If there are existing charts using the database, it can be replaced with another database in the dropdown.
Otherwise, type the name of the database to be disconnected in the input box to disconnect. Once the Disconnect button is clicked, the database will be irrevocably disconnected.