BI 2 Data Cubes and OLAP

7/31/2019 BI 2 Data Cubes and OLAP

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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 ?

DataCube


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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

24

Week 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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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/releases/20121105181253/tmp/scratch_6/BI%203a%20APCMIS%20Fact%20Dimension%20Version.ppthttp://localhost/var/www/apps/conversion/releases/20121105181253/tmp/scratch_6/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/releases/20121105181253/tmp/scratch_6/BI%203a%20APCMIS%20Fact%20Dimension%20Version.ppthttp://localhost/var/www/apps/conversion/releases/20121105181253/tmp/scratch_6/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/releases/20121105181253/tmp/scratch_6/BI%202a%20APCMIS%20Fact%20Dimension%20Version.ppthttp://localhost/var/www/apps/conversion/releases/20121105181253/tmp/scratch_6/BI%203a%20APCMIS%20Fact%20Dimension%20Version.ppt


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ClientsData Cubes

Products and Vendors

Data Marts

Data

Warehouse

OLTP

Databases

DBMSVendors

Oracle, 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 ToolVendors

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


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Dhruv Nath

BI 2Data Warehousing : Data

Cubes and OLAP

Documents

BI 2 Data Cubes and OLAP