Easily the coolest features in Super Graph, GraphQL subscriptions can be used to subscribe to a GraphQL query and receive near-realtime updates on any database updates related to that query.
In Super Graph subscriptions are designed to be highly scalable. You can easily handle tens of thousands of subscribers on a relatively a basic server, even your database server can be pretty basic. This is because Super Graph uses only a single database query for thousands of connections.
Compare this to traditional client side polling solutions which require as many query as subscribers. With Super Graph you can now add realtime updates to your application without the worry of database load.
For very large deployments it scales horizontally and vertically as in can leverage more CPU and memory added per instance as well as read-replicas or a distributed database like Yugabyte.
No additional configuration is needed for subscriptions except for the
poll_every_seconds: 3 config parameter to control how often super graph should check for updates. Default value is every 5 seconds.