data processing
DESCRIPTION
COMP1TRANSCRIPT
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Data Processing
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‘‘Computers main purpose is to
manipulate data to produce information’’
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Data Processing a group of activities
used to manipulate data to produce meaningful information
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Definition of Terms• Data• Process• Information
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Objectives• to provide information for planning, decision making and control of business operations
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Objectives• to record current transactions• to provide historical information
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Categories• Manual• Mechanical• Electronical
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Manual Data Processing employs tools and
materials such as pens, pencils, forms, carbon papers and filing cabinets
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Mechanical Data Processing uses various materials
such as typewriters, calculators and other machines
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Electronical Data Processing employs computers
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Methods• Batch• On-line• Real time• Distributed
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Batch Processing the simplest form of data
processing data are collected or
accumulated into large volumes before processing
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Batch ProcessingAdvantages:1. Economical when a large volume
of data must be processed2. Appropriate for application where
the delay does not reduce the value of the information.
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Batch ProcessingDisadvantages:1. Requires sorting prior to
processing2. Reduces timeless 3. Requires sequential file
organization
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On-line Processing one which uses devices
directly connected to the CPU either for data entry or inquiry purposes
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Real Time Processing processing of data is
done immediately a form of processing that
uses terminals linked to a CPU via telecommunication lines
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Distributed Processing most complex level of
computer processing consists of remote
terminals linked to a large central computer system
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Distributed ProcessingAdvantages:1. Central processor idle time is
reduced2. Managers maybe able to react
more rapidly and interact to seek solutions to unusual problems.
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Distributed ProcessingDisadvantages:1. Provisions for protecting the
confidentiality and integrity and integrity of user programs and data files are generally ineffective
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Characteristic• Timeliness• Accuracy• Pertinence• Economic Feasibility
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Data Processing Cycle
INPUT PROCESS
STORAGE
OUTPUT
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Computer System
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