Your Future
Computers Are Your Future
Lecture 2
Chapter 12
Client/Server Database Systems
Data server – Professionally administered program that runs on a local area network (LAN); it responds to requests for data
Client – A user-friendly program that accesses the server; users can add data, maintain records, perform queries, and generate reports
Clients request data using a query language called Structured Query Language (SQL)
Client/Server Database Systems
Query
Specially phrased question used to access specific information
The Internet Connection: Going Public With Data
Web-based integration is the latest trend in database software
Information is stored in databases that are available through the Internet
Advantages of Database Management Systems
Data integrity is the validity of the data.
Data validation defines acceptable input ranges for each field.
Types of data validation are:
Alphabetic check
Numeric check
Data independence refers to how data is stored so that it can be used with different types of application programs.
Avoidance of data redundancy refers to avoiding the repetition of data.
Data security is the unavailability of data to people who would misuse it.
Data is also protected from loss due to equipment
failure.
Data maintenance refers to the procedures for
adding, updating, and deleting records.
The areas of importance for building a quality database are:
Data integrity
Data independence
Avoidance of data redundancy
Data security
Data maintenance
competition
An information system is designed to bring data,
computers, procedures, and people together to manage information important to an organization’s mission
To be valuable, information must be:
Accessible
Accurate
Complete
Economical
Relevant
Reliable
Secure
Simple
Timely
Verifiable
Functional Divisions of an Organization
Transaction Processing Systems (TPSs)
TPSs handle an organization’s accounting needs
Early TPSs used batch processing systems
Online processing consists of entering transaction data and viewing the results immediately
TPSs enable managers to make operational decisions
TPSs can produce summary and exception reports
