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Databases

Explore the significance of databases in TPS, CRM, and other applications, and understand the impact of data organization on information quality. Learn about the problems with file-based systems and how a database management system (DBMS) can overcome them. Gain knowledge about relational databases, their design terms, and the role of SQL. Discover web-based databases, distributed databases, data warehousing, OLAP, data mining, and data scrubbing.

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Databases

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  1. Databases MGMT 661 - Summer 2012 Night #4, Lecture Part 1 Based on textbook Chapter 6

  2. Why study databases? • databases are the central component of TPS, CRM, etc. • Data organization impacts information quality.

  3. Old Style Data Management Application Software Application Software Data File Data File Data File Data File Data File Many "legacy systems" still work this way.

  4. Terms to Know: • Field / Attribute • Record • Field Type textbook Figure 6-1

  5. Problems with File-based Systems • Data Redundancy • Data Inconsistency • different values in different files • different names for attributes • different attributes types for the same attribute • Program-data Dependence • zip codes • Y2K • Lack of Data Sharing textbook p 211-212

  6. Database Management System Application Application Application Application Database

  7. 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

  8. Database Design Terms to Know • Table • Record • 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 permissions textbook Figure 6-4

  9. Database Design

  10. Database Design monitors monitors enables/disables enables/disables security system security system sensor sensor tests tests programs is programmed by programs is programmed by

  11. SQL - Structured Query Language • Which suppliers are in Ohio? SELECT Supplier_Name from Supplier WHERE Supplier_State = "OH";

  12. Web-Based Databases textbook Figure 6-16

  13. Misc Database Terms • Distributed Databases • Data Warehouse • Online Analytical Processing (OLAP) • Data Mining • web mining • text mining • Data Scrubbing

  14. Homework • Design the tables for a small pizza delivery shop. • Design? • number of tables? • fields in each table? • primary keys? • Uses for this information?

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