Abstract
Computers are becoming more widely used in a large number of the complicated scientific applications such as aerospace and defense systems, nuclear reactor control, and computer integrated manufacturing (CIM) with their ever-increasing performance-price ratio. These applications require not only complex scientific processing/analysis but also real-time processing for their data to control external devices correctly. To support real-time applications, a real-time database system which satisfies the requirements of timing constraints in collecting, updating and retrieving data is needed. This paper describes WatchMan, a real-time database system which supports engineering data required in CIM applications in monitoring and controlling machines in the factory. In order to provide real-time processing features, the real-time database system manages all data as a main memory database. A new storage structure and an access method appropriate for main memory databases have been developed for this purpose. Also, concurrency control and recovery techniques suitable for the real-time processing in the CIM environment have been proposed. In addition, this paper presents solutions to the problems which result from developing the main memory databases under Unix system.
Published Version
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