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数据库管理系统:ch01 Introduction.ppt
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数据库管理系统:ch01 Introduction.ppt
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©Silberschatz, Korth and Sudarshan1.1Database System Concepts - 5
th
Edition, May 23, 2005
An Introduction to Database System
An Introduction to Database System
©Silberschatz, Korth and Sudarshan1.3Database System Concepts - 5
th
Edition, May 23, 2005
Chapter 1: Introduction
Chapter 1: Introduction
Database-System Applications
Purpose of Database Systems
View of Data
Database Languages
Relational Databases
Database Design
Object-based and semistructured databases
Data Storage and Querying
Transaction Management
Database Architecture
Database Users and Administrators
Overall Structure
History of Database Systems
©Silberschatz, Korth and Sudarshan1.4Database System Concepts - 5
th
Edition, May 23, 2005
Database Management System (DBMS)
Database Management System (DBMS)
DBMS provides an environment that is both convenient and efficient to
use. It contains
A collection of interrelated data, i.e. database which contains
information about a particular enterprise
A set of programs to access the data
Database Applications:
Banking: all transactions
Airlines: reservations, schedules
Universities: registration, grades
Sales: customers, products, purchases
Online retailers: order tracking, customized recommendations
Manufacturing: production, inventory, orders, supply chain
Human resources: employee records, salaries, tax deductions
Databases touch all aspects of our lives
©Silberschatz, Korth and Sudarshan1.5Database System Concepts - 5
th
Edition, May 23, 2005
Purpose of Database Systems
Purpose of Database Systems
In the early days, database applications were built directly on top of
file systems
Drawbacks of using file systems to store data:
Data redundancy and inconsistency
Multiple file formats, duplication of information in different files
Difficulty in accessing data
Need to write a new program to carry out each new task
Data isolation — multiple files and formats
Integrity problems
Integrity constraints (e.g. account balance > 0) become
“buried” in program code rather than being stated explicitly
Hard to add new constraints or change existing ones
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