Database Systems
36
ucceeding with Technology Database Systems Basic Data Management Concepts Organizing Data in a Database Database Management Systems Using Database Systems in Organizations Database Trends Managing Databases Please discontinue use of cell phone and turn off ringer Chapter 7
description
Database Systems. Basic Data Management Concepts Organizing Data in a Database Database Management Systems Using Database Systems in Organizations Database Trends Managing Databases. Please discontinue use of cell phone and turn off ringer. Chapter 7. The Value of Databases. - PowerPoint PPT Presentation
Transcript of Database Systems
Succeeding with Technology
Database Systems
Basic Data Management Concepts Organizing Data in a Database Database Management Systems Using Database Systems in Organizations Database Trends Managing Databases
Please discontinue use of cell phone and turn off ringer
Chapter 7
Succeeding with Technology
The Value of Databases
Databases and Database Management Systems (DBMS) transform large quantities of data into specific and valuable information for accomplishing some goal.
Succeeding with Technology
7.1
Basic Data Management Concepts
• DBMS• Field• Record• File• Primary Key
Key Terms
Succeeding with Technology
Database Management System (DBMS)
A DBMS consists of a group of programs that manipulate the database and provide an interface between the database and the user or the database and application programs.
Front End
DATABASE
Back End
DBMS
SecureAccess
Succeeding with Technology
File or Table
Database
A collection of data organized to meet user’s needs.
Records (Entities)
Field(Attribute)
Succeeding with Technology
Database Fields
Fields are set to hold specific types of data.
Succeeding with Technology
Database
A Database is a
collection of files/tables
Succeeding with Technology
Database Heirarchy
Succeeding with Technology
Keys and Primary Key
Key: A field in a record that is used to identify the record
Primary key: A field that uniquely identifies a recordA primary key field prevents duplicate
records from occurring in a table.
Succeeding with Technology
Primary Keys
Which field would act as the best primary key?Which field would act as the best primary key?
Succeeding with Technology
Primary Keys
Succeeding with Technology
Primary Key
Succeeding with Technology
Simple but Restrictive DBMS
Succeeding with Technology
The Database Approach to Data Management
Succeeding with Technology
7.2
Organizing Data in a Database
• Relational Model• Data Analysis
Key Terms
Succeeding with Technology
The Relational Model
In a relational database, tables are linked (related) through common fields.
Succeeding with Technology
Relation Types One-to-many
Most typical Makes use of primary key
One-to-one Many-to-many
Succeeding with Technology
Data Analysis
Data analysis is a process that involves evaluating data to identify problems with the content of a database.Consider what would happen if
CardNumber were not a primary key, and two or more customers had the same CardNumber.
Data Integrity refers to the accuracy of the data in a database.
GIGO, or Garbage In Garbage Out, refers to the fact that inaccurate data entered in a database will result in inaccurate information produced from the database.
Succeeding with Technology
Northwind Database Example
http://pic.fsu.edu/nwind.mdb
Succeeding with Technology
7.3
Database Management Systems
• Data Integrity• GIGO• Schema• Data Dictionary• SQL
Key Terms
Succeeding with Technology
Database Types
Single User vs. Multiuser General-Purpose vs. Special-Purpose Open-Source
Succeeding with Technology
Creating a Database
A schema is an outline of the logical and physical structure of the data and relationships among the data in the database.
Succeeding with Technology
Creating a Database
A data dictionary provides a detailed description of all data used in the database.
Succeeding with Technology
Database Strengths
Data can be sifted, sorted and queried through the use of data manipulation languages.
The power of a database and DBMS lies in the user’s ability to manipulate the data to turn up useful information.
Succeeding with Technology
Data Manipulation Language
A Data Manipulation Language (DML) is a specific language provided with the DBMS that allows people and other database users to access, modify, and make queries about data contained in the database, and to generate reports.
Structured Query Language (SQL): The most popular DML. SELECT * FROM EMPLOYEE WHERE JOB_CLASSIFICATION = ‘C2”
Succeeding with Technology
7.4
Using Database Systems in Organizations
• Data Warehouse• Data Mining
Key Terms
Succeeding with Technology
Data Stores Data Warehouse: A database that holds
important information from a variety of sources.
Data Mart: A small data warehouse, often developed for a specific person or purpose.
Data Mining: the process of extracting information from a data warehouse.“Connecting the dots”
Succeeding with Technology
Data Stores
Succeeding with Technology
Business Intelligence
Business Intelligence is the use of data mining to help increase efficiency, reduce costs, or increase profits.
Succeeding with Technology
7.5
Database Trends
• Distributed Database
Key Terms
Succeeding with Technology
Databases and the Internet
The Web is frequently used as the Front End of DBMS’s.
Succeeding with Technology
Distributed Database
Succeeding with Technology
Other Types of Databases
Visual, audio, and unstructured database systems organize non-textual data.
Succeeding with Technology
7.6
Managing Databases
• Database Administrator
Key Terms
Succeeding with Technology
Database Administrator
A database administrator (DBA) is a skilled and trained computer professionals who directs all activities related to an organization’s database, including providing security from intruders.
Succeeding with Technology
Chapter 7 Questions?
Don’t forget to turn your phone on!!
