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Chapter_5-Organizing%20Data%20and%20Information

Chapter_5-Organizing%20Data%20and%20Information - Why is...

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©2010 Francisco Delgadillo© 1 Files and Databases Data Resource Management a managerial activity that applies information systems technology and management tools to manage the company’s data resources DBA Database Administrator: responsible for the development and management of the organization’s database DBAs work with programmers and system’s analysts to design and implement the database DBAs also work with users and managers of the firm to establish policies for managing an organization’s database Why is there a demand for more and better data? Competitive environment powerful workstations that can handle data quickly More computer literate personnel Equivalents DBMS Library Office Database Card Catalog File Cabinet File Card Drawer File Drawer Record Catalog Card File Folder Record Attributes Card data Report Example of a Data Elements
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2 Hierarchy of Data Database Files Records Attributes Characters Bits Hierarchy of Data ringbutton3 Database circle5 Integrated collection of logically related data elements circle5 Personnel File, Payroll File, Department File ringbutton3 File (eg. personnel file) 098-40-1370 D’Acosta, Miranda 1-20-2010 594-39-3948 Bell, Nicholas 3-24-2009 234-34-3483 Beck, Barrett 2-02-2009 457-74-3854 Grey, Rebekah 1-23-2009 Hierarchy of Data Record (Record containing SSN, Last and First name, Hire date) 594-41-3955 Lynch, Kelly 4-24-2007 Attribute (first name) Kelly Characters (bytes) 01001011 (Letter “K” in ASCII) Bits 0 or 1 Flat File A table storing all database information in one large two-dimensional table Data Management Approaches Traditional Approach Database Approach Traditional File Processing ©2010 Francisco Delgadillo©
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3 Traditional Approach data are stored, organized and processed in independent files of data records Problems: data duplication lack of integration data dependence Database Management Approach Database Approach files are consolidated into a common pool of
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