objectives overview
DESCRIPTION
Objectives Overview. See Page 513 for Detailed Objectives. Objectives Overview. See Page 513 for Detailed Objectives. Databases, Data, and Information. Page 514. Databases, Data, and Information. Database software , often called a database management system ( DBMS ), allows users to:. - PowerPoint PPT PresentationTRANSCRIPT
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Your Interactive Guide to the Digital World
Discovering Computers 2012
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Discovering Computers 2012: Chapter 10 2
Objectives Overview
Define the term, database, and explain
how a database interacts with data and
information
Define the term, data integrity, and describe
the qualities of valuable information
Discuss the terms character, field, record,
and file
Describe file maintenance
techniques and validation techniques
Differentiate between a file processing
approach and the database approach
See Page 513 for Detailed Objectives
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Discovering Computers 2012: Chapter 10 3
Objectives Overview
Discuss the functions common to most
database management systems
Describe characteristics of relational, object-
oriented, and multidimensional
databases
Explain how to access Web databases
Identify database design guidelines and discuss the responsibilities of database analysts and
administrators
See Page 513 for Detailed Objectives
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Discovering Computers 2012: Chapter 10 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• Documents• Audio• Images• Video
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Discovering Computers 2012: Chapter 10 5
Databases, Data, and Information
• Database software, often called a database management system (DBMS), allows users to:
Page 515
Create a computerized database
Add, modify, and delete data
Sort and retrieve data Create forms and reports from the data
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Discovering Computers 2012: Chapter 10 6
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
• For most organizations data is one of there most valuable assets
• Data integrity is important because organizations make decisions on the data they store
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Discovering Computers 2012: Chapter 10 7
Databases, Data, and Information
• Valuable information should have the following characteristics:
Pages 516 - 517
Accurate Verifiable Timely Organized
Accessible Useful Cost-effective
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Discovering Computers 2012: Chapter 10 8
The Hierarchy of Data
• Data is organized in layers– Files (tables), records, fields, characters
Page 517 Figure 10-2
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Discovering Computers 2012: Chapter 10 9
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
Page 518 Figure 10-3
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Discovering Computers 2012: Chapter 10 10
The Hierarchy of Data
• Common data types include:
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Text Numeric AutoNumber Currency
Date Memo Yes/No Hyperlink
Object Attachment
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Discovering Computers 2012: Chapter 10 11
The Hierarchy of Data
Page 519Figure 10-4
• A record is a group of related fields– A primary key uniquely identifies each record
• A data file (table) is a collection of related records
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Discovering Computers 2012: Chapter 10 12
Maintaining Data
• File maintenance refers to the procedures that keep data current
Page 520
Adding records
Modifying records
Deleting records
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Discovering Computers 2012: Chapter 10 13
Maintaining Data
• Users add new records to a file when they obtain new data
Page 520 Figure 10-5
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Discovering Computers 2012: Chapter 10 14
Maintaining Data
• Users modify a record to correct inaccurate data or update old data
Page 521 Figure 10-6
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Discovering Computers 2012: Chapter 10 15
Maintaining Data
• When a record no longer is needed, a user deletes it from a file
Page 522 Figure 10-7
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Discovering Computers 2012: Chapter 10 16
Maintaining Data
• Validation compares data with a set of rules or values to find out if the data is correct (validity check)
• Validation Rules
Pages 522 - 524
Alphabetic/Numeric check Range check Consistency check
Completeness check Check digit Other checks
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Discovering Computers 2012: Chapter 10 17
File Processing Versus Databases
Pages 524 - 526
File processing system
• Each department has its own set of files
• Used for many years• Increases data redundancy• Creates Isolated data
Database approach
• Programs and users share data
• Reduces data redundancy• Improves data integrity• Share data• Allows easier access• Reduces development time• Disadvantages: can be more
complex and vulnerable
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Discovering Computers 2012: Chapter 10 18
File Processing Versus Databases
Page 525 Figure 10-10
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Discovering Computers 2012: Chapter 10 19
Database Management Systems
Page 527 Figure 10-11
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Discovering Computers 2012: Chapter 10 20
Database Management Systems
• A data dictionary contains data about each file (table) in the database and each field in those files (tables)
• A.k.a Metadata
Pages 527 – 528 Figure 10-12
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Discovering Computers 2012: Chapter 10 21
Database Management Systems
• A DBMS provides several tools that allow users and programs to retrieve and maintain data in the database
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Query language
Query by example
Form
Report generator
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Discovering Computers 2012: Chapter 10 22
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
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Discovering Computers 2012: Chapter 10 23
Database Management Systems
Page 529 Figure 10-13
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Discovering Computers 2012: Chapter 10 24
Database Management Systems
• A form is a window on the screen that provides areas for entering or modifying data in a database
• View one record ata time
Page 530 Figure 10-15
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Discovering Computers 2012: Chapter 10 25
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 531 Figure 10-16
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Discovering Computers 2012: Chapter 10 26
Database Management Systems
A DBMS provides means to ensure that only authorized users access data at permitted times• Access privileges• Principle of least privilege (users are given
lowest level of privileges necessary to perform their job tasks)
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Discovering Computers 2012: Chapter 10 27
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
Pages 531 - 532
Backup Log
Recovery utility
Continuous backup
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Discovering Computers 2012: Chapter 10 28
Log, cont.
Page 532 Figure 10-17
Before Image
Actual change of address
After Image
Recovery utilities can be used to reenter or recover lost data
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Discovering Computers 2012: Chapter 10 29
Relational, Object-Oriented, and Multidimensional Databases
Page 533 Figure 10-18
• A data model consists of rules and standards that define how the database organizes data
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Discovering Computers 2012: Chapter 10 30
Relational, Object-Oriented, and Multidimensional Databases
• 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 (common/matching field)
Page 533 Figure 10-20
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Discovering Computers 2012: Chapter 10 31
Relational, Object-Oriented, and Multidimensional Databases
• Structured Query Language (SQL) is a query language that allows users to manage, update, and retrieve data
Page 534 Figure 10-21
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Discovering Computers 2012: Chapter 10 32
Relational, Object-Oriented, and Multidimensional Databases
• An object-oriented database (OODB) stores data in objects
• Examples of applications appropriate for an object-oriented database include:
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Multimedia database
Groupware database
Computer-aided design
database
Hypertext database
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Discovering Computers 2012: Chapter 10 33
Relational, Object-Oriented, and Multidimensional Databases
• A multidimensional database can store data in more than two dimensions of data– Sometimes known as a hypercube– 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
• Data mining: used to find patterns and relationships among data– Web sites can use data mining to determine customer
preferencesPages 535 - 536
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Web Databases
• Databases on the Web allow you to:
Discovering Computers 2012: Chapter 10 34Page 536
Shop for products or
servicesBuy or sell stocks Search for a job
Make airline reservations
Register for college classes
Check semester grades
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Discovering Computers 2012: Chapter 10 35
Web Databases
Page 536 Figure 10-23
Web page is often the front end to the database
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Discovering Computers 2012: Chapter 10 36
Database Administration
• It is important to have a carefully designed database
Page 537 Figure 10-24
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Discovering Computers 2012: Chapter 10 37
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
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Discovering Computers 2012: Chapter 10 38
Database Administration
• Employees should learn how to use the data in the database effectively– Interact with database– Identify new data for the
database– Maintain the database
Page 538 Figure 10-25
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Discovering Computers 2012: Chapter 10 39
Summary
How data and information are
valuable assets to an organization
Methods for maintaining high-
quality 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
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