1. A data processing system including, in combination, a relational database, means for detecting at least one of an in said relational database or a condition in said relational database, means for storing at least a first command corresponding to each of a plurality of tasks, means responsive to said means for detecting at least one of an event or a condition in said relational database for selecting said first command corresponding to one of said plurality of tasks, and means for outputting said first command to a portion of said data processing system for execution of said first command.