Presented By:Muhammad Rizvi

Raghuram VempaliSurekha Vemuri

BackgroundApex Supermarket is a supermarket chain

with 50 stores in the West Coast, East Coast, Midwest, and Southwest

They have stores in:West Coast: CaliforniaEast Coast: Georgia, New York, VirginiaMidwest: Illinois, KansasSouthwest: Texas

OLTP System LimitationsCurrently, there is an inability to make

strategic decisionsCannot make drill-down or roll-up type

reportsCannot support multi-dimensional analysis

and decision making

Business NeedHelp executive staff study the sale of

products by Categories, Regions, States, Cities, Stores, and Time

Executive Staff will be able to figure out sales revenue through the different dimension combinations

Give strategic information for the Executive Staff to make decisions on optimizing prices of products

Why A Data Warehouse?Allows Decision Support

Provide An Informational System For Executives To Make Strategic Decisions like the following: Which is the period of time where school products

are sold most? Which are the racks that the school products have

to be moved to in order to attract customers during “school season”?

Why A Data Warehouse?Allows Decision Support

Provide An Informational System For Executives To Make Strategic Decisions like the following: Which are the store locations where perishable items

like fruits and vegetables need to moved off fast? What is the period of time for which meat foods could

stay on rack at the Illinois location of Apex?

Central RepositoryRoll-up and Drill-Down

Gives Sales by Category, Region, Store, etc.

Potential Starting DimensionsTime

YearQuarterMonthDay

AreaRegionsStatesCities

CategoriesPerishables

Fruits/Vegetables Dairy Meats

Non-Perishables Drinks Snacks School Supplies Cigarettes

Proposed Data Warehouse Extract data from the Data

Warehouse and populate one or more Data Marts for use by groups

Decision makers Production

DepartmentPersonnel

DepartmentData in data mart is

organized using Star schema or Snow flake

Uses Dimensional Tables

Relational Vs Dimentional

Relational databases are stable, flexible and work well for online transaction processing.

A Dimensional Model is a database structure that is optimized for online queries and Data Warehousing

tools.  It is comprised of "fact" and "dimension" tables.

Dimensional Models are designed for reading, summarizing and analyzing numeric information,

whereas Relational Models are optimized for adding and maintaining data using real-time operational

systems.

Database and ToolsOnline Transaction Processing (OLTP)

Microsoft SQL Server 2008 is used as the RDBMS

Online Analytical Processing (OLAP)Microsoft SQL Server 2008 Analysis Services

Questions???