chapter 10 database management. how it works what is a database? where do you find databases? what...

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