Resource Scheduling in Mobile Distributed Real Time Database Systems: A New Perception For Operating Systems

Mobile Distributed Real Time Databases have all of the requirements of conventional databases with ACID properties and also require the management of mobility with time constrained data as well as transactions in distributed environment without failure that make the consistency in the database which is more important than anything. These entire additional requirements do not fulfill by the general operating system which supports the functioning of the MDRTDS systems. The database designers have to implement their own utilities like resource scheduling. a great deal it is just a replication of some common services. As a result a combined, devoted system, which will remove the duplication and improve the performance, is required instead of MDRTS System on top of conventional or a new Operating system for MDRTDS. The important property of the data in a mobile computing system is that their values can be highly dynamic and sensitive as they are used to maintain the useful and important information. To maintain the freshness and validity of the data items, Data items should be updated often by the generation of update transactions or by other means. Update transactions consist of one to several write operations and its arrival rate can be very high. It is assumed that a well-formed concurrency control protocol are used Mobile clients issue mobile transactions to access data items at the database, it has a sequence of transactions with a dead line. More over mobile transaction will become totally useless after its deadline and has to be aborted or restarted. The available operating system does not meet these trouble causes by mobility in the database system. Middle ware software in the form of system software is required to support the conventional operating system used by database management system especially for MDR TDS.