Data management for LEP control

The LEP data include information relevant to the construction, installation, operation and maintenance of the accelerator. This paper describes their proposed organisation into a unified semi-integrated system. To provide the required efficiency and flexibility, the data will be grouped into various structures, optimised with respect to their functionality. Interactive databases are the primary source of information; these will also allow relational access to the archive of the control system. Live data structures, initialized from the interactive data, allow simultaneous manipulation of three independent representations of the accelerator (reference, current and target machines). A user-friendly access to the control system entities is provided by a Data Dictionary