Discovering Computers Fundamentals, 2011 Edition. Living in a Digital World
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1 Discovering Computers Fundamentals, 2011 Edition Living in a Digital World
2 Objectives Overview Define the term, database, and explain how a database interacts with data and information Describe the qualities of valuable information Discuss the terms character, field, record, and file Describe file maintenance techniques (adding records, modifying records, deleting records) and validation techniques Differentiate between a file processing approach and the database approach See Page 351 for Detailed Objectives 2
3 Objectives Overview Discuss the functions common to most database management systems Describe characteristics of relational, objectoriented, and multidimensional databases Explain how to access Web databases Discuss the responsibilities of database analysts and administrators See Page 351 for Detailed Objectives 3
4 Databases, Data, and Information Database Collection of data organized in a manner that allows access, retrieval, and use of that data Data Collection of unprocessed items Text Numbers Images Audio Video Information Processed data Organized Meaningful Useful Page 352 4
5 Databases, Data, and Information Pages Figure 9-1 5
6 Databases, Data, and Information Database software, often called a database management system (DBMS), allows users to: Create a computerized database Add, modify, and delete data Sort and retrieve data Create forms and reports from the data Page 352 6
7 Databases, Data, and Information Data integrity identifies the quality of the data Garbage in, garbage out (GIGO) points out the accuracy of a computer s output depends on the accuracy of the input Page 353 7
8 Databases, Data, and Information Valuable information should have the following characteristics: Accurate Verifiable Timely Organized Accessible Useful Costeffective Page 354 8
9 The Hierarchy of Data Data is organized in layers Files, records, fields, characters Page 355 Figure 9-2 9
10 The Hierarchy of Data A character is one byte Numbers, letters, space, punctuation marks, or other symbols A field is a combination of one or more related characters Field name Field size Data type Pages Figure
11 The Hierarchy of Data Common data types include: Text Numeric AutoNumber Currency Date Memo Yes/No Hyperlink Object Attachment Page
12 The Hierarchy of Data A record is a group of related fields A primary key uniquely identifies each record A data file is a collection of related records Page 356 Figure
13 Maintaining Data File maintenance refers to the procedures that keep data current Adding records Modifying records Deleting records Pages
14 Maintaining Data Users add new records to a file when they obtain new data Page 357 Figure
15 Maintaining Data Users modify a record to correct inaccurate data or update old data Pages Figure
16 Maintaining Data When a record no longer is needed, a user deletes it from a file Pages Figure
17 Maintaining Data Validation compares data with a set of rules or values to find out if the data is correct Alphabetic/Numeric check Range check Consistency check Completeness check Check digit Other checks Pages Click to view Web Link, click, Click Web Link from left navigation, then click Data Validation below 17
18 File Processing Versus Databases File processing system Each department has its own set of files Used for many years Have data redundancy Isolate data Database approach Programs and users share data Reduce data redundancy Improve data integrity Share data Allows easier access Reduces development time Can be more vulnerable Pages
19 File Processing Versus Databases Page 362 Figure
20 Database Management Systems Page 363 Figure 9-11 Click to view Web Link, click, Click Web Link from left navigation, then click MySQL below 20
21 Database Management Systems A data dictionary contains data about each file in the database and each field in those files Page 364 Figure
22 Database Management Systems A DBMS provides several tools that allow users and programs to retrieve and maintain data in the database Query language Query by example Form Report generator Pages
23 Database Management Systems A query language consists of simple, English-like statements that allow users to specify the data to display, print, or store Query by example (QBE) provides a GUI to assist users with retrieving data Pages
24 Database Management Systems Page 365 Figure
25 Database Management Systems A form is a window on the screen that provides areas for entering or modifying data in a database Page
26 Database Management Systems A report generator allows users to design a report on the screen, retrieve data into the report design, and then display or print the report Page 366 Figure
27 Database Management Systems A DBMS provides means to ensure that only authorized users access data at permitted times Access privileges Principle of least privilege Page 367 Click to view Web Link, click, Click Web Link from left navigation, then click Data Security below 27
28 Database Management Systems A DMBS provides a variety of techniques to restore the database to a usable form in case it is damaged or destroyed Backup Log Page 367 Click to view Web Link, click, Click Web Link from left navigation, then click Continuous Backup below Recovery utility Continuous backup 28
29 Relational, Object-Oriented, and Multidimensional Databases Page 368 Figure 9-17 Click to view Web Link, click, Click Web Link from left navigation, then click Relational Databases below A data model consists of rules and standards that define how the database organizes data A relational database stores data in tables that consist of rows and columns Each row has a primary key Each column has a unique name A relationship is a link within the data 29
30 Relational, Object-Oriented, and Multidimensional Databases Structured Query Language (SQL) is a query language that allows users to manage, update, and retrieve data Page 369 Figure
31 Relational, Object-Oriented, and Multidimensional Databases An object-oriented database (OODB) stores data in objects Object-oriented databases often use Object Query Language (OQL) to manipulate and retrieve data Click to view Web Link, click, Click Web Link from left navigation, then click Object-Oriented Databases below Page
32 Relational, Object-Oriented, and Multidimensional Databases A multidimensional database can store data in more than two dimensions of data Can consolidate data much faster than a relational database A data warehouse is a huge database that stores and manages the data required to analyze historical and current transactions Click to view Web Link, click, Click Web Link from left navigation, then click Data Warehouses below Page
33 Web Databases Databases on the Web allow you to: Shop for products or services Buy or sell stocks Search for a job Make airline reservations Register for college classes Check semester grades Page
34 Web Databases Page 371 Figure
35 Database Administration It is important to have a carefully designed database Page 371 Figure 9-20 Click to view Web Link, click, Click Web Link from left navigation, then click Database Design Guidelines below 35
36 Database Administration Database analysts and administrators are responsible for managing and coordinating all database activities Database Analyst (DA) Decides on proper field placement, defines data relationship, and identifies users access privileges Database Administrator (DBA) Creates and maintains the data dictionary, manages security, monitors performance, and checks backup and recovery procedures Page
37 Database Administration Employees should learn how to use the data in the database effectively Page
38 Summary How data and information are valuable assets to an organization Methods for maintaining highquality data Assessing the quality of valuable information Advantages of organizing data in a database Various types of databases Roles of the database analysts and administrators Page
39 Discovering Computers Fundamentals, 2011 Edition Living in a Digital World Complete
Chapter 10 Managing a Database. Discovering Computers Your Interactive Guide to the Digital World
Chapter 10 Managing a Database Discovering Computers 2012 Your Interactive Guide to the Digital World Objectives Overview Define the term, database, and explain how a database interacts with data and information
Chapter 10 Managing a Database. Discovering Computers Your Interactive Guide to the Digital World
Chapter 10 Managing a Database Discovering Computers 2012 Your Interactive Guide to the Digital World Databases, Data, and Information Database Collection of data organized in a manner that allows access,
Objectives Overview. Chapter 10 Managing a Database. Discovering Computers Instructor: M. Imran Khalil MSc-IT 1 st semester Fall 2016
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