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Ch 9 types of computer operations

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Ch 9 types of computer operations

  1. 1. 1 Types of Computer Operations Real time Processing Batch Processing Multitasking Interactive Multiprogramming Transaction processing Multi-access and timesharing
  2. 2. 2 Real time processing  System is automatically updated when a change is made due to transaction occur.  The terminals must be connected to the computers.  Must be an online system.  Real-Time systems may be either hard or soft real-time.
  3. 3. 3 Examples Medical imaging systems  Industrial control systems Traffic Lights Robots Flight Simulations ATM
  4. 4. 4 Batch Processing  Collecting all the inputs together and putting them into computer in one go or batch.  Several jobs are kept in main memory at the same time, and the CPU is multiplexed among them.  Processing is carried out from beginning to end without user interaction.  Advantage: Computer operator load data only one operation
  5. 5. 5 Examples Payroll Systems Tax systems Production of electricity Bills National Insurance contributions
  6. 6. 6 Single Processor Multiprocessor:
  7. 7. 7 Multiprogramming  Is defined as the apparent simultaneous execution of two or more programs.  When one job needs to wait for I/O, the processor can switch to the other job
  8. 8. 8 Multitasking : That can execute more than one processor at the same time.
  9. 9. 9 Transaction Processing  Processing takes place when needed, rather than at set intervals like batch processing.  Demand processing is usually performed on individual items of data.  Transactions processed as they occur immediate update of transactions  Updates available to all users of the system increased security risk  Additional costs in terms of physical resources e.g. Hardware more complex backup Example:  A monthly paid employee leaves halfway through the month.
  10. 10. 10 Interactive System User interacts directly with the system to supply commands. Data as the application program undergoes execution and receives the results of processing. Direct to way communication
  11. 11. 11 Time Sharing processing Using multiprogramming to handle multiple interactive jobs Processor’s time is shared among multiple users Multiple users simultaneously access the system through terminals. Examples  Airline booking Systems
  12. 12. 12 Multi Access Give the user the impression that he is the only one using the system. CPU user user useruser user