The ARCS Data Point Processor

This paper presents the main ideas behind our soft real-time database system prototype called Data Point Processor (DPP). The main dim in designing such systems is to minimize the application programs part of database management and therefore to avoid heavy data transfers between the database server and the application client due to polling. Our design is based on the observation of data transfer and database design in an environmental monitoring system. Due to the changing needs of the user we tried to ooer a exible tool for describing diierent problems associated with air pollution monitoring. However, the Data Description Language (DDL) which is also presented in this paper is applicable to problems of a diierent nature, too. The DPP is a main memory oriented, user level application which provides soft deadline handling and is extendible with user written C functions.