chapter 10 database management. how it works what is a database? where do you find databases? what...
TRANSCRIPT
Chapter 10
Database Management
How it Works
What is a Database?
Where do you find Databases? What is a Database Manager? Name some Databases:
Doctor’s offices URG Employer/Employees Magazine Subscriptions Highway Patrol
Garbage In = Garbage Out
Data Integrity – What is it? Accurate Information Timely Information Organized Information Accessible Information Useful Information Cost-Effective Information
Data Hierarchy Characters Fields (Columns)
Data Types Text Number Yes/No (Check Box) Date & Time Memo
Records Tables (Building blocks of databases) Files (Databases)
Popular Databases
Cost Comparison
Criteria
FoxPro
Access
Oracle
Least expensive.
$ 595 194 Definitely NOT cheap.
Easy to convert from word processing.
N/A Does do some sharing.
Has Query Language, QBE, Forms, a Report Generator and Backup/Recovery options. (At least one of these.)
Sample Data Types
Sample Member File
Maintaining Data
Adding Records Changing Records Deleting Records Validating Data
File Processing VS Databases
File Processing Data Redundancy Duplication Errors
Data Approach No redundancy or duplication Fewer errors More secure (only one file) Sharing Data is easier
Database Management Systems
Data Dictionary or repository Contains data for each file
File retrieval and maintenance Uses SQL
Query Language (SQL) Query by Example (QBE)
Creates Forms and Reports Data Security, backup and recovery
Relational Databases
Object-Orientated Databaes
OODB Multimedia database Computer aided design (CAD) Hypertext database Web database
Multidimensional Databases
Known as a hypercube Most common use
Data warehouses
Web Databases
PERSONAL Last name First name Middle Initial SS# Gender Address City State Zip Country DOB Ethnicity StudentID Housing
ACADEMIC GPA Major Past Education ACT SAT Credits Earned Minor StudentID
Database Administrators