Data

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The Latin word datum means something that is known. The plural of datum is data, which could be translated as things that are known. In this book, however, as in most books dealing with computing, we treat the word data as a singular collective noun. Although the words data and information are commonly used as synonyms, information implies data that has had some organisation to facilitate understanding.

Information may be true or it may be false. It is largely the responsibility of humans to ensure that the information we have contains the truth.

Databases

A database is a large collection of things that are known. To belong to this collection the things do require a certain amount of organisation. So we should think of a database as a large collection or a store of information (true or false). An information system is a database along with the means to effectively manipulate the information it contains. The means to manipulate the information is known as a database management system, usually abbreviated to DBMS.

Stores of information, and the means to manage them, are as old as mankind. Through the millennia they have taken many forms, including chants and songs, drawings on stone, and hand written records on clay, skins and papyrus. The development of fast and powerful computers, coupled with a parallel growth in software, has brought about a dramatic growth in the capacity and efficiency of modem information systems. The information systems in this book focus on computerised storage and management.

Common examples of the application of information systems today include automated libraries, airline booking, video hire, student record keeping, software help, supermarket stock control, and countless others.

Computerised information systems offer the following advantages over manual systems of the past

• Information stored on CDs and magnetic discs and tapes occupies a relatively small amount of space.

• Information can be accessed very quickly.

• The likelihood of human error can be greatly reduced.

• A computer can deal with what were previously long and boring tasks performed by humans.

• information can be made available to a large number of people simultaneously, in the one building or around the world.

• Sophisticated electronic methods can be used to protect the information in a database.

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