CIT 343

Concord

Wednesday, August 11, 2004

Introduction

• blumberg.7@osu.edu• http://home.comcast.net/~johnblumberg• To get student files go to

www.course.com select Computer ScienceISBN 061921323Xget files and PPTs and such.

• I will be using Access 2000/2003

CIT 343

• 20% Homework Problems

• 30% Design Project

• 20% Midterm Quiz

• 20% Final

• 10% Class Participation

CIT 343

• Database Systems"Design, Implementation, & Management, , Rob and Coronel, Sixth Edition, Course Technology, ISBN 061921323X.

• With care Database Systems"Design, Implementation, & Management, , Rob and Coronel, Fifth Edition, Course Technology, ISBN 061906269X

Information is Power

• A resource

• Is expensive

• Is vital

• Is most important

Information is Power

• Data is a raw statistic

• Information is processed data

• Information is used to make decisions

• Information is used to manage

Database

• A technology

• An organized cohesive collection of related objects defined within itself.

Database

• Bits

• Bytes

• Fields

• Records

• Files

• Databases

• Warehouses

Database can be Centralized

• Single user on a PC

• Multi user on a LAN or WAN

• Terminal to Host

• Client - Server

Database can be Distributed

• File Servers

• Client Servers

• Horizontal

• Vertical

Data System Approaches

• Lore - people dependent

• Manual - paper dependent

• Computerized– Redundant with no sharing– Inconsistent with no standards– Inflexible with custom programming

Data System Approaches

• Database– Minimal redundancy– Integrated data– Shared data– Less programming– More security– Easy data access– Data independence

Database Management System

• A DBMS is

• A software entity that provides

• The database technology

Database Management System

• Costs– Personnel– Backup– Conflicts– Turf

Database Models

• Do It Yourself

Open window (A) and fly kite (B). String (C) lifts small door (D) allowing moths (E) to escape and eat red flannel shirt (F). As weight of shirt becomes less, shoe (G) steps on switch (H) which heats electric iron (I) and burns hole in pants (J). Smoke (K) enters hole in tree (L), smoking out opossum (M) which jumps into basket (N), pulling rope (O) and lifting cage (P), allowing woodpecker (Q) to chew wood from pencil (R), exposing lead. Emergency knife (S) is always handy in case opossum or the woodpecker gets sick and can't work.

Database Models

• Do It Yourself

• Hierarchical

Database Models

• Do It Yourself

• Hierarchical

• Networked

Database Models

• Do It Yourself

• Hierarchical

• Networked

• Relations– E. F. Codd & Chris Date, 1970

The Object Model

Object Data Management Group The Standard for Storing Objects