Like MongoDB or Couchbase, RethinkDB is a clustered, document-oriented database that delivers the benefits of flexible schema, easy development and high scalability. Unlike those other document databases, RethinkDB supports “real-time” applications with the ability to continuously push updated query results to applications that subscribe to changes.
In this case, a “real-time” application is one that must support a large flow of client requests that alter the state of the database and keep all clients apprised of those changes. A common example of a real-time application is the multiplayer game: Hundreds or thousands of users are pushing buttons, those button pushes are changing the game state, and all of the users must see all of the changes in real time.
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