Chapter One (Database System) Objectives Introduction to Database Management Systems (DBMS) Data and Information History of DB Types of DB

2 DATA and INFORMATION Data: Raw facts; building blocks of information Unprocessed information Information: Data processed to reveal meaning

3 Examples: What are the examples of raw data? How can row data become information?

4 Definitions Introduction to Databases. Database Management Systems (DBMS) Why DB?

5 Advantages of DBMS Centralized Control…. Redundancy Inconsistency Shared Data Standard Security Integrity Multiple View

6 Disadvantages of DBMS: Complex Design Cost Software Specialist Program Failure Others…

7 What is a good database: Based on a Data Model. Support one or more high level programming languages. Multiple user (Transaction Management) Recovery method

8 Definition: Data Item Record File DB Domain

9 Type of Databases: Single-user: Supports only one user at a time Desktop: Single user database running on a personal computer Multi-user: Supports multiple users simultaneously.

10 Type of Databases: Workgroup: Multi-user database that supports a small group of users or a single department Enterprise: Multi-user database that supports a large group of users or an organization

11 Type of Databases by Location: Centralized: Supports data located at a single site Distributed: Supports data distributed across several sites