DatabasesDatabasesMGMT 661 - Summer 2012

Night #4, Lecture Part 1

Based on textbook Chapter 6

Why study databases?Why study databases?databases are the central

component of TPS, CRM, etc.

Data organization impacts information quality.

Old Style Data Old Style Data ManagementManagement

ApplicatioApplicationn

SoftwareSoftware

Data

File

Data

File

Data

File

ApplicatioApplicationn

SoftwareSoftware

DataFile

DataFile

Many "legacy systems"still work this way.

textbook Figure 6-1

Terms to Know:•Field / Attribute•Record•Field Type

Problems with File-based Problems with File-based SystemsSystems

Data RedundancyData Inconsistency

◦different values in different files◦different names for attributes◦different attributes types for the same

attributeProgram-data Dependence

◦zip codes◦Y2K

Lack of Data Sharing

textbook p 211-212

Database Management Database Management SystemSystem

DatabaseDatabase

ApplicationApplication

ApplicatioApplicationn

ApplicationApplication

ApplicatioApplicationn

The DBMS uncouples programs and data

Relational Database◦data organized as 2D "Tables", not text

Files

Example DBMS◦Big Systems

Oracle Database Microsoft SQL Server

◦Small Systems MySQL

◦Single Computer Microsoft Access

Database DesignDatabase DesignTerms to KnowTableRecord

◦ info about an entity (eg a supplier)

Primary Key◦ must be unique

Foreign Key◦ used to link to

another table

Data Dictionary◦ what is this field◦ read/write

permissionstextbook Figure 6-4

Database DesignDatabase Design

Database DesignDatabase Design

securitysystem

sensor

monitors

enables/disables

tests

programsis programmed by

securitysystem

sensor

monitors

enables/disables

tests

programsis programmed by

SQLSQL - - Structured Query Structured Query LanguageLanguageWhich suppliers are in Ohio?SELECT Supplier_Name from Supplier WHERE Supplier_State = "OH";

Web-Based DatabasesWeb-Based Databases

textbook Figure 6-16

Misc Database TermsMisc Database TermsDistributed DatabasesData WarehouseOnline Analytical Processing

(OLAP)Data Mining

◦web mining◦text mining

Data Scrubbing

HomeworkHomeworkDesign the tables for a small pizza delivery shop. Design?

number of tables? fields in each table? primary keys?

Uses for this information?