Hi Tanmay
Lightstreamer does not include database services, but only helps you sending data to web pages without the need to reload the pages. This means that you need to code a Data Adapter that can access to your database and receives notifications from the database whenever data in your database changes.
The Interaction Demo case is so simple that the servlet (running on Tomcat) which receives the user input is also used to keep the data state. Notifications for data changes are then sent by the servlet to Lightstreamer Adapter through JMS.
For the complete set of system requirements I just redirect you to
this page
Dario