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15 Topic Section

Commercial Data Processing - CDP Industrial and Commercial Applications

Content - What you need to know Main Aspect F/G/C Need for computers in CDP systems

Advantages over a Manual System

Data Processing Cycle

Hardware and Software

• • • • • •

Volume of documents Speed of processing Repetitive tasks Speed of access Orders processed quicker Few errors

• Data collection & preparation • Data input • Data processing and storage • Data output • Mainframe computer • Terminals


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C • Information for managers

Large number of customers – • Easy to maintain contact • Easy to hold information • • Difference between data and information

• Single entry multiple use

The Big Picture Large companies like banks, supermarkets, chain stores, mail order companies, travel companies, airlines and organisations like the police, Inland Revenue and Vehicle Licensing Centre would find life very difficult without their highly advanced computer systems. These systems handle huge amounts of data and often use mainframe computers costing millions of pounds to do the processing. The data can be input from hundreds of terminals all over the country.

Need for computers in CDP systems • • • •

Volume of documents – bank with ½ million members Speed of processing – calculate 100 000 gas bills Repetitive tasks – service at bank ATM machines Access speed – police tracing a car reg. and owner

Computer systems make it easier for to collect information for managers, eg. what items are selling best in a supermarket, or comparing sales for different branches of a chain store.

BA computer systems at Glasgow Airport (video), check in thousands of pasengers each day. Tasks include • bar coding and directing bags • calculating weight allowance • displaying arrivals / departures. • records movement of planes • records of food / fuel for individual planes

Hardware and software Hardware – CDP systems often require a mainframe computer with several fast processing units for data and communications. They have huge amounts of main memory and backing storage. Output may require fast volume printers, eg for thousands of bank statements or electricity bills. These systems run 24/7 and will require special systems for security and backup. Terminals – these are used for data input and there may be hundreds attached to the mainframe. Some may be simply a keyboard and screen (also called a visual display unit -VDU). Terminals can be remote, ie in another town and connected to the computer through a network link, eg. lottery terminals or bank ATM’s. Mainframe systems are usually multi-user with many users on-line at the same time. The hardware and software is designed to allow fast access and error checking.

DGS S Grade Computing Studies

A mainframe computer can occupy a whole room and will cost £millions.

Hundreds of terminals (some remote) can be used to access the data stored on the mainframe.

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Advantages over a manual system Banks and shops existed long before computers. The calculations were done by hand. Modern CDP systems using computers have many advantages :• Fast processing with errors checked by the system • Easy to hold large databases of customers information • Easy to contact customers using mail merge or e-mail • No duplication of data by using single entry multiple use

At the airport, the details of a flight are entered once, but the data has multiple uses :• Baggage handlers • The caterers • Crews who fuel and maintain the aircraft • The public using the display monitors

Data Processing Cycle Data processing cycle – this is the order that data is processed in. There are 4 main stages (eg. for lottery tickets) :-

Data collection and preparation

1. data collection and preparation – (mark 6 numbers on form) 2. data input – (terminal reads numbers from form) 3. data processing and storage - (compare with winning draw and calculate amount won, then store results on disk) 4. data output – (print lists of winners and prize money)

Data output

Data and Information - Data becomes information when you understand what it means dg04hensg is data stored in a computer. If you know the structure of the data then you have information. This is a user-name for Gavin Henson who started Dunbar Grammar school in 2004.

Data input

Data processing and storage

Information – has a meaning, eg. 8th Oct 2005 – is used by people Data – has no meaning, eg. 10082005 – is processed by a computer

Computers process data, people use information.

Information = Data + structure

Questions 1

What does CDP mean?


Give two reasons why we need computers in CDP.


Explain how a mainframe computer is different to a desktop.


What is a remote terminal ?


What is single entry multiple use.


What is the difference between data and information.


Which part of the data processing cycle comes first?

DGS S Grade Computing Studies

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15 - Commercial Data Processing 1  

Hardware and software BA computer systems at Glasgow Airport (video), check in thousands of pasengers each day. Tasks include • bar coding a...

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