CIT 343 Concord Wednesday, August 11, 2004

Introduction To get student files go to select Computer Science ISBN X get files and PPTs and such. I will be using Access 2000/2003

CIT % 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 X. With care Database Systems"Design, Implementation, & Management,, Rob and Coronel, Fifth Edition, Course Technology, ISBN X

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