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Dhruv Nath

BI 2Data Warehousing : Data

Cubes and OLAP

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How is a Data Warehouse Organised ?

Therefore how do we query it ?

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Example : DW for a bank : 2 - D matrix

How do we query this ?

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How do we query this Data Cube ?

Data

Cube

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2 -D Slice

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A different 2-D Slice

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1-D Slice

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Thicker Slice

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Thicker Slice

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Drill down ?

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Drill down ?

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Roll Up ?

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Data Cubes - Facts and Dimensions - disc

Can we have multiple facts ? Examples ?

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How are snapshots added at

the end of each time period ?

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BrandAfri Cola

Royal Crown

Pepsi

Coca-Cola

Wrangler Cola

Coca-Cola

24Week Ending

03 10 17

ChannelMM

DrugFood

$28.3 Million

Example 2

Food

24

Query : Show me

sales of Coca-Cola through theFood channel, forthe week endingthe 24th.

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Examples from your organisations ?

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DW : Typical Analytical Queries

Bank : Get me the total value of credit card

transactions in the month, by Geography, by

Customer, by Month, from 2008 to 2012

Telecom company : Get me the total minutes of

calls made in each quarter, and also the total

number of call drops in the quarter, forall States in

North India, by Geography , by Customer, by

Payment Plan, by Quarter, for the period 2010 to

2012

Car Manufacturer : Get me the Average Sales per

day, by Car Model for the Esteem, Swift, Zen, and

EECO, by Dealer, by Financing Scheme, by Month,

between Jan 2005 and Dec 2011

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CRM is for.

Customers Dealers / Distributors

Suppliers

Employees..

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DW of Suppliers Dimensions

Suppliers Geography

Product

Time

Facts

Quantity Supplied

Price at which supplied

No. of defects

Delivery time

Delivery delay

Discount on quoted price

Payment delayed / withheld

Complaint by Supplier

Complaint by Supplier - resolved

Possible Queries ?

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Data Cubes

The Data Warehouse Architecture

Data Marts

Data

Warehouse

OLTP

Databases

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Data Cubes - Summarise

Data Cubes 1-D, 2-D, 3-D

Can we have n-D Data Cubes ?

Yes, but need to represent them differently

Facts and Dimensions Usually multiple facts

Querying

Slice and Dice Drill Down

Roll Up

OLAP - On Line Analytical Processing ( vs OLTP )

APCMIS

http://localhost/var/www/apps/conversion/tmp/scratch_1/BI%203a%20APCMIS%20Fact%20Dimension%20Version.ppthttp://localhost/var/www/apps/conversion/tmp/scratch_1/BI%203a%20APCMIS%20Fact%20Dimension%20Version.ppt

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Exercise

Create a Data Warehouse Design for theCRM System of a company that supplies

stationery to Offices

Facts ?

Dimensions ?

What are the possible Data Marts from this

Data Warehouse ?

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Clients

User Interface

Data Cubes

The Data Warehouse Architecture

Data Marts

Data

Warehouse

OLTP

Databases

Finally, what does the user see and use ? User Interface

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End User Interface

Dashboard APCMIS

Qlikview

http://localhost/var/www/apps/conversion/tmp/scratch_1/BI%203a%20APCMIS%20Fact%20Dimension%20Version.ppthttp://localhost/var/www/apps/conversion/tmp/scratch_1/BI%202a%20APCMIS%20Fact%20Dimension%20Version.ppthttp://us.demo.qlikview.com/QvAJAXZfc/opendoc.htm?document=qvdocs/Sales%20Management%20and%20Customer%20Analysis.qvw&host=Demo11&anonymous=truehttp://us.demo.qlikview.com/QvAJAXZfc/opendoc.htm?document=qvdocs/Sales%20Management%20and%20Customer%20Analysis.qvw&host=Demo11&anonymous=truehttp://localhost/var/www/apps/conversion/tmp/scratch_1/BI%202a%20APCMIS%20Fact%20Dimension%20Version.ppthttp://localhost/var/www/apps/conversion/tmp/scratch_1/BI%203a%20APCMIS%20Fact%20Dimension%20Version.ppt

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ClientsData Cubes

Products and Vendors

Data Marts

Data

Warehouse

OLTP

Databases

DBMS

VendorsOracle, Microsoft SQL Server, IBM (DB2),..

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ClientsData Cubes

Products and Vendors

Data Marts

Data

Warehouse

OLTP

Databases

Provide everything except the OLTP DBMS and DW. ETL included

BI Tool

Vendors

SAS, Cognos (IBM), Business Objects (SAP), Qlikview..

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Dhruv Nath

BI 2Data Warehousing : Data

Cubes and OLAP