Distributed Processing Systems

By Robert J. Thierauf | Go to book overview
THE NEED FOR DISTRIBUTED PROCESSING
ESSENTIAL CHARACTERISTICS OF DISTRIBUTED PROCESSING SYSTEMS
THREE-LEVEL SYSTEM APPROACH
INTERACTIVE PROCESSING AND/OR BATCH PROCESSING MODES
UTILIZATION OF VARIOUS I/O TERMINAL DEVICES
TIMELY REPORTS THAT USE "MANAGEMENT BY EXCEPTION"
DISTRIBUTED DATA BASE AT THE APPROPRIATE LEVEL
SIMPLIFIED APPROACH TO PROGRAMMING AND IMPLEMENTATION
LOCAL AUTONOMY OF DATA PROCESSING OPERATIONS
RECAP OF ESSENTIAL CHARACTERISTICS OF DISTRIBUTED PROCESSING
DISTRIBUTED PROCESSING SYSTEMS DEFINED
CHAPTER SUMMARY
QUESTIONS
SELECTED REFERENCES

2
ESSENTIALS OF DISTRIBUTED PROCESSING SYSTEMS

Various approaches to information systems design, as set forth in the prior chapter, have evolved over the years where each new design is meant to try to correct deficiencies of the previous one. Currently, an important thrust in business information systems, i.e., comprehensive management information systems that provide managers throughout an organization with information they need to make decisions, is real-time MIS. On-line real-time capabilities of such information systems require extensive use of costly random access devices and remote terminals, which involves large financial commitments at the initial stage of implementation. Many organizations may neither have nor be willing to risk such enormous amounts of capital and time on such sophisticated information systems. In view of these realities, many organizations are moving in the direction of simpler and easier-to- use systems, such as distributed processing systems. Not only are the costs lower, but also the time to implement such systems is substantially less.

Although the declining costs of microcomputers, minicomputers, and small

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