Performance Issues in Distributed Real - Time Database Systems
DataBase Management System (DBMS) uses external magnetic device (disks) for the storage of mass data. They offer low cost per bit and non-volatility, which makes them indispensable in today's DBMS technology. However, under commercially available operating systems, data can only be manipulated (i.e., compared, inserted, modified and deleted) in the main storage of computer. Therefore, part of the database has to load in to main storage area before manipulated and written back to the disk after modification; a database buffer had to be maintained for purpose of interfacing main memory and disk.