Prof. HeleMai Haav: CSC 230 Spring *03 Overview: Databases

A database system (DBMS) is a program product for keeping computerized records about an enterprise sales database university database web examples ?

Database system provides efficient, convenient, and safe multi-user storage of and access to massive amounts of persistent data Banking system data-? Massive -many gigabytes, on disk persistent -data outlives programs that operate it multi-user -Jane and ATM1; John and ATM2; the same account number safe -from system failures and malicious users convenient -simple commands efficient - do not search all files to find info

Major Database Systems Oracle-Oracle server, runs Unix, Win NT: www.oracle.com DB2 Universal Database-IBM, Unix www.ibm.com/db2 Informix Dynamic Server 2000, Unix www.informix.com Microsoft SQL Server, Access Sybase

A Relational database

Object Relational database

Database System Architecture

SQL Agent Module Connection session SQL-server SQL client The SQL Client-server interaction

Database Users End users application programmers- write apps casual- SQL queries naïve- menus application programmers- write apps database administrators-supervise the DBMS

Data Warehouses

Roughly 90% of decisions are made without the benefit of the information you already have. The most intelligent solution is an open, integrated data warehouse and business intelligence infrastructure based on proven technology and industry "best practices" to turn that data into a strategic resource while reducing risk.

Data warehousing is bringing data from operational databases to a single warehouse to do analysis (OLAP) and mining www.walmart.com

What is in data warehouse? “fact data” sales transactions, course enrollments update frequently, very large “dimension data” store items, students, courses update infrequently, not as large

Two models for data warehouse dim Relational OLAP star schema Multidimensional OLAP data cube, facts in cells dimensions form axes facts time Total sales region facts sales channel

Oracle 11i www.oracle.com education.oracle.com Sybase Industry Warehouse Studio Adaptive Server IQ www.sybase.com

Oracle 9i Oracle9i Database Oracle9i Database Release 2 is the first major follow-on release to the award-winning Oracle9i Database. In addition to numerous quality and performance enhancements, Oracle9iDB Release 2 features full XML database functionality with the new XML DB feature, enhancements to the groundbreaking Oracle9i Real Application Clusters and additional self-tuning and self-management capabilities to help improve productivity and efficiency. In addition, the built-in OLAP functionality has been expanded and significant enhancements and tunings have been made for Windows and Linux systems.

Sybase http://www.sybase.com/

MS Access http://www.microsoft.com/office/using/column06.asp http://www.microsoft.com/office/access/evaluation/tour/page3.asp

Rolling Thunder Bicycles (an example)