Types of Computer Operations
Real time Processing
Multi-access and timesharing
Real time processing
System is automatically updated when a
change is made due to transaction occur.
The terminals must be connected to the
Must be an online system.
Real-Time systems may be either hard or soft
Medical imaging systems
Industrial control systems
Collecting all the inputs together and
putting them into computer in one go or
Several jobs are kept in main memory at
the same time, and the CPU is multiplexed
Processing is carried out from beginning
to end without user interaction.
Advantage: Computer operator load data
only one operation
Production of electricity Bills
National Insurance contributions
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
That can execute more than one
processor at the same time.
Processing takes place when needed, rather than at set
intervals like batch processing.
Demand processing is usually performed on individual items
Transactions processed as they occur immediate update of
Updates available to all users of the system increased
Additional costs in terms of physical resources e.g.
Hardware more complex backup
A monthly paid employee leaves halfway through the month.
User interacts directly with the system to
Data as the application program
undergoes execution and receives the
results of processing.
Direct to way communication
Time Sharing processing
Using multiprogramming to handle
multiple interactive jobs
Processor’s time is shared among multiple
Multiple users simultaneously access the
system through terminals.
Airline booking Systems
Give the user the impression that he is the
only one using the system.