THE REVOLUTION AHEAD: PUBLISH/SUBSCRIBE MEETS DATABASE SYSTEMS

The traditional way of user interaction with a database system follows the classical ârequest/response â query paradigm where the user is issuing a query and retrieving the result as fast as possible. The primary issues are efficiency and consistency. Driven by huge numbers of concurrent users accessing large data sets especially in the context of Data Warehouse Systems, the ârequest/response â paradigm looks no longer feasible. There is commonly no doubt that the novel query paradigm of âpublish/subscribe â may be one way to diminish the before mentioned problems. In the âpublish/subscribe â context, a user registers a subscription (also called a standing query) once at a subscription management system and periodically or aperiodically receives notifications, i.e. the result of the query with regard to the currently valid state of the underlying database. In this paper, we give an overview of the âpublish/subscribe â paradigm in general and introduce the framework of the content- and memory-based subscription system Pub-Scribe. The PubScribe framework provides an open platform for information publishing and registering of complex structured subscriptions. The PubScribe subscription model as well as the processing model are discussed. 12