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The Datacycle architecture

A database system is, by one definition [4], "a system whose overall purpose is to maintain information and to make that information available on demand." Database systems have evolved as part of a response to the desire to separate concerns. That is, the "application" should be responsible for manipulation of information and for its presentation to a user, and the "database system" should perform application-independent data management operations. A true separation, however, is difficult to achieve in practice. Often, the internal data structures and physical placement of data within the database system are optimized to achieve efficient performance for those queries known to be critical for the target application. The data schema itself may also reflect performance concerns. For particularly demanding applications, such as information filtering, database management may be completely customized to meet the needs of the application and even embedded within the application itself. The Datacycle TM architecture [2, 10] is a radical approach to database management. It attempts to achieve a full separation of concerns between the needs of many applications and the database management system supporting those needs, even for applications with unusually high demands for flexibility in access to data and for performance. In the Datacycle architecture, the contents of the entire database are broadcast cyclically over high-bandwidth communication facilities to multiple very large-scale integration (VLSI) data filters that perform complex associative search operations in parallel. The cyclic broadcasting and hardware filtering of information allow a different set of technology trade-offs affecting system architecture, functionality, and performance. The result is a unique combination of functionality and performance to support complex information management applications: • As in most database systems based on the relational model [3], the interface between the