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Please discontinue use of cell phoneand turn off the ringer.
Basic Data Management Concepts Organizing Data in a Database Database Management Systems Using Database Systems in
Organizations Database Trends Managing Databases
Database Systems
Chapter 7
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The Value of Databases Databases are a key ingredient of
today’s most popular Internet services, and the backbone of our information-driven economy.
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Key Terms DBMS Field Record File Primary Key
Basic Data Management Concepts
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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
Back End
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Database A collection of data organized to meet user’s
needs.
Field
Record
File or Table
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Database Fields
Fields are set to hold specific types of data.
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Database Hierarchy
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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.
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Primary Keys
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Simple but Restrictive DBMS
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The Database Approach to Data Management
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Key TermsRelational ModelData Analysis
Organizing Data in a Database
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The Relational Model In a relational database, tables are linked
(related) through common fields.
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Relation Types One-to-many
Most typical Makes use of primary key
One-to-one Many-to-many
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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.
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Key TermsData IntegrityGIGOSchemaData DictionarySQL
Database Management Systems
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Database Types
Flat File
Single User
Multiuser
General-Purpose
Special-Purpose
Open-Source
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Single User
Only one person can use the database at any time.
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Multiuser
The U.S. federal government has developed a Web-based DBMS that provides access to 100,000 federal data sources to U.S. citizens.
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General & Special Purpose
General purpose can be used for large number of applications. Oracle is currently the market leader.
Special purpose is designed for one purpose or a limited number of applications.
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Open-Source Database Systems
Open source DBMS offer the same advantages as all open-source software: there is strong community support, they are completely customizable, and they are free.
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Database Tables Database tables can contain a few
or millions of records and fields.
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Input and Output Interface Designs Designing effective interfaces is a convenient and
powerful database design feature in most database management systems.
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Data Accuracy and Integrity Data accuracy means that data stored in the
database is accurate and up to date.
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.
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Creating a Database
A data dictionary provides a detailed description of all data used in the database.
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Key Terms Data Warehouse Data Mining
Using Database Systems in Organizations
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Information and Decision Support Database
systems are a valuable tool for producing information that supports decision making for people and organizations.
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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”
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Business Intelligence
Business Intelligence is the use of data mining to help increase efficiency, reduce costs, or increase profits.
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Key Terms Distributed Database
Database Trends
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Databases and the Internet A number of trends in
the development and use of databases and database management systems will meet these changing needs.
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Distributed Database
With a distributed database, also called a virtualized database, the actual data may be spread across several databases at different locations.
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Database Systems, the Internet and Networks
This online shopping site uses the Web as the front end to a database of thousands of products and reviews.
The back-end database is invisible and behind the scenes.
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Key Terms Database Administrator
Managing Databases
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Database Administrator
A database administrator (DBA) is a skilled and trained computer professional who directs all activities related to an organization’s database, including providing security from intruders.
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Chapter 7 Questions?