1. Database Systems Basic Data Management Concepts
Chapter 7
Database Systems
Basic Data Management Concepts
Organizing Data in a Database
Database Management Systems
Using Database Systems in Organizations
Database Trends
Managing Databases
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2. The Value of Databases
Databases and Database Management Systems (DBMS) transform large quantities of data into specific and valuable information for accomplishing some goal.

3. 7.1 Basic Data Management Concepts
DBMS
Field
Record
File
Primary Key
Key Terms

4. 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.
Secure Access
DATABASE
DBMS
Front End
Back End

5. Database A collection of data organized to meet user’s needs.
File or Table
Field (Attribute)
Records (Entities)

6. Database Fields
Fields are set to hold specific types of data.

7. Database
A Database is a collection of files/tables

8. Database Heirarchy

9. 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 record
A primary key field prevents duplicate records from occurring in a table.

10. Primary Keys
Which field would act as the best primary key?

11. Primary Keys

12. Primary Key

13. Simple but Restrictive DBMS

14. The Database Approach to Data Management

15. 7.2 Organizing Data in a Database
Relational Model
Data Analysis
Key Terms

16. The Relational Model
In a relational database, tables are linked (related) through common fields.

17. Relation Types One-to-many One-to-one Many-to-many Most typical
Makes use of primary key
One-to-one
Many-to-many

18. 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.

19. Northwind Database Example

20. 7.3 Database Management Systems
Data Integrity
GIGO
Schema
Data Dictionary
SQL
Key Terms

21. Database Types Single User vs. Multiuser
General-Purpose vs. Special-Purpose
Open-Source

22. 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.

23. Creating a Database
A data dictionary provides a detailed description of all data used in the database.

24. Database Strengths
The power of a database and DBMS lies in the user’s ability to manipulate the data to turn up useful information.
Data can be sifted, sorted and queried through the use of data manipulation languages.

25. 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”

26. 7.4 Using Database Systems in Organizations
Data Warehouse
Data Mining
Key Terms

27. 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”

28. Data Stores

29. Business Intelligence
Business Intelligence is the use of data mining to help increase efficiency, reduce costs, or increase profits.

30. 7.5 Database Trends
Distributed Database
Key Terms

31. Databases and the Internet
The Web is frequently used as the Front End of DBMS’s.

32. Distributed Database

33. Other Types of Databases
Visual, audio, and unstructured database systems organize non-textual data.

34. 7.6 Managing Databases
Database Administrator
Key Terms

35. 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.

36. Chapter 7 Questions?
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