Introduction to Data Warehousing
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PRESENTED BY: ELVIS PEREYMER
04/10/2023
Introduction to Data Warehousing
![Page 2: Introduction to Data Warehousing](https://reader035.fdocuments.in/reader035/viewer/2022081414/54bfe57c4a79592e2c8b458a/html5/thumbnails/2.jpg)
Data Warehousing Presentation Topics
04/10/2023
What is a Data Warehouse? Why do I need a Data Warehouse?
What are its goals? What are its objectives?
Where does “Business Intelligence” fit here ? The software products that present the data warehouse data to
users are sometimes called Business Intelligence Tools. Demo of “Pentaho” – an Open Source Business Intelligence tool
connected to an already built Data warehouse. Q & A
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Many names for the same thing
04/10/2023
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Many names for the same thing
04/10/2023
• Decision Support System (DSS)
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Many names for the same thing
04/10/2023
• Decision Support System (DSS)• Executive Information System
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Many names for the same thing
04/10/2023
• Decision Support System (DSS)• Executive Information System• Management Information System
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Many names for the same thing
04/10/2023
• Decision Support System (DSS)• Executive Information System• Management Information System• Analytics Application
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Many names for the same thing
04/10/2023
• Decision Support System (DSS)• Executive Information System• Management Information System• Analytics Application• Reporting System
![Page 9: Introduction to Data Warehousing](https://reader035.fdocuments.in/reader035/viewer/2022081414/54bfe57c4a79592e2c8b458a/html5/thumbnails/9.jpg)
Many names for the same thing
04/10/2023
• Decision Support System (DSS)• Executive Information System• Management Information System• Analytics Application• Reporting System
a system for helping companies get the information they want, when they want it, and how they want it - from one single source.
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Purpose of a Data warehouse
Establish the foundation for Decision Support Decision process of an organization will involve analysis, data
mining, forecasting, decision modeling etc. By having a common point, which can provide consistent, quality data with high response time provides the core enabler for making fast and informed decisions.
04/10/2023
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Why do I need a Data Warehouse?
Current way of getting data or reports is not ideal
04/10/2023
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Why do I need a Data Warehouse?
Current way of getting data or reports is not ideal
Dependent on a resource such as a developer
04/10/2023
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Why do I need a Data Warehouse?
Current way of getting data or reports is not ideal
Dependent on a resource such as a developer someone who knows your companies underlying database
structure and is familiar with a query language such as SQL used to retrieve data.
04/10/2023
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Why do I need a Data Warehouse?
Current way of getting data or reports is not ideal
Dependent on a resource such as a developer someone who knows your companies underlying database
structure and is familiar with a query language such as SQL used to retrieve data.
Limited to Standard Reports built thereby limiting you do ad hoc reporting
04/10/2023
![Page 15: Introduction to Data Warehousing](https://reader035.fdocuments.in/reader035/viewer/2022081414/54bfe57c4a79592e2c8b458a/html5/thumbnails/15.jpg)
Why do I need a Data Warehouse?
Current way of getting data or reports is not ideal
Dependent on a resource such as a developer someone who knows your companies underlying database
structure and is familiar with a query language such as SQL used to retrieve data.
Limited to Standard Reports built thereby limiting you do ad hoc reporting
Performance reasons limit you to running reports during “off peak” hours
04/10/2023
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Why do I need a Data Warehouse?
04/10/2023
Multiple source systems collecting similar or related information.
CRM, ERP, Operational Databases, Spreadsheets Operational Databases may be archived and considered to be a
separate source system
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Why do I need a Data Warehouse?
Summary of existing Reporting problems
04/10/2023
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Why do I need a Data Warehouse?
Summary of existing Reporting problems
Difficulty in accessing your data.
04/10/2023
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Why do I need a Data Warehouse?
Summary of existing Reporting problems
Difficulty in accessing your data. Unable to perform ad-hoc reporting
04/10/2023
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Why do I need a Data Warehouse?
Summary of existing Reporting problems
Difficulty in accessing your data. Unable to perform ad-hoc reporting Not aware of “All” the data that is tracked in your systems.
04/10/2023
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Why do I need a Data Warehouse?
Summary of existing Reporting problems
Difficulty in accessing your data. Unable to perform ad-hoc reporting Not aware of “All” the data that is tracked in your systems. Performance issues. Data is not optimized for reporting.
04/10/2023
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The Value of the Data Warehouse
04/10/2023
Integrated Multiple Source Systems Common Terminology Consistently Updated
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The Value of the Data Warehouse
04/10/2023
Time Variant Data in the Warehouse is associated with a point in time Essential for time-series historical analysis and forecasting
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The Value of the Data Warehouse
04/10/2023
Non-volatile Once loaded, data does not change. The answer to a given historical question will not change based on
the time the question is posed to the warehouse.
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The Value of the Data Warehouse
04/10/2023
Strategic Analysis Historical analysis Forecasting analysis Evaluation of performance to corporate strategic goals Discovery of revenue opportunities Cost reduction
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The Value of the Data Warehouse
04/10/2023
The Data Warehouse Defined: Integrated Time Variant Non-volatile Strategic Analysis Tool (Business Intelligence)
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Demo Time!
04/10/2023
Sample Data warehouse put together using Pentaho (an Open Source Business Intelligence solution)
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I Want One!
04/10/2023
Plan! Plan! Plan!Resources
Experienced DW Architect Programmers Familiar with Legacy Systems Users Familiar with Legacy Data
Thank you,Elvis [email protected](917)754-4638
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I Want One!
04/10/2023
How long will it take?On going project. Depends on the amount of data sources you have and
the resources that understand the data sources. Suggestion is to start with the Agile methodology and
build “data marts” per subject area.
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I Want One!
04/10/2023
End User Presentation Tools
Business Objects Cognos (Powerplay, Impromptu) Microsoft Business Intelligence Suite Pentaho BI Solution – Open Source Many, many others!
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Summary
04/10/2023
DW are used for Decision support Analysis Not the same as your operational systems Designed badly, they are not useful