The ARCS data point processor

The paper presents the main ideas behind our soft real time database system prototype called Data Point Processor (DPP). The main aim 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 offer a flexible tool for describing different problems associated with air pollution monitoring. However, the Data Description Language (DDL) which is also presented in the paper is applicable to problems of a different 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