INB210 Introduction to Databases.pdf

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Queensland University of Technology
Richi Nayak

Introduction to Databases 290713 1236 PM A database is a structured set of data information held in a computer especially one that is accessible in various ways It can be thought of as a digitized filing cabinetLarge organizations need to record large volumes of dataManual record keepingTime consumingExpensiveConcurrent access is difficultLimited number of copies Remote access is difficult Organizations use digital information Using computers requires information to be retrieved updated and stored on a digital device Types of Databases1 Personal Databases Contains information primarily of interest to only one person2 Application SpecificContaining information concerning a specific part of an organizationEquivalent to each department having their own group of Filing cabinets3 Corporate DatabasesAll of an organizations information Advantages of smaller databasesEasier to constructAllows for the organizations workload to spread across computersEasier to back up DisadvantagesHarder to develop programs that require data from one or more databases at the same time Data redundancyEasier to forget to backup More staff are required Because of complexity corporate databases are rarely found in larger organizationsNonetheless because of data redundancy it is important to minimise the number of databases in any organization
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