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PRESENTED BY: ELVIS PEREYMER 06/07/2022 Introduction to Data Warehousing
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PRESENTED BY: ELVIS PEREYMER
04/10/2023
Introduction to Data Warehousing
Data Warehousing Presentation Topics
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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
Many names for the same thing
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Many names for the same thing
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• Decision Support System (DSS)
Many names for the same thing
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• Decision Support System (DSS)• Executive Information System
Many names for the same thing
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• Decision Support System (DSS)• Executive Information System• Management Information System
Many names for the same thing
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• Decision Support System (DSS)• Executive Information System• Management Information System• Analytics Application
Many names for the same thing
04/10/2023
• Decision Support System (DSS)• Executive Information System• Management Information System• Analytics Application• Reporting System
Many names for the same thing
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• 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.
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.
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Why do I need a Data Warehouse?
Current way of getting data or reports is not ideal
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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
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
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
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
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Why do I need a Data Warehouse?
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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
Why do I need a Data Warehouse?
Summary of existing Reporting problems
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Why do I need a Data Warehouse?
Summary of existing Reporting problems
Difficulty in accessing your data.
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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
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
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.
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The Value of the Data Warehouse
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Integrated Multiple Source Systems Common Terminology Consistently Updated
The Value of the Data Warehouse
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Time Variant Data in the Warehouse is associated with a point in time Essential for time-series historical analysis and forecasting
The Value of the Data Warehouse
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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.
The Value of the Data Warehouse
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Strategic Analysis Historical analysis Forecasting analysis Evaluation of performance to corporate strategic goals Discovery of revenue opportunities Cost reduction
The Value of the Data Warehouse
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The Data Warehouse Defined: Integrated Time Variant Non-volatile Strategic Analysis Tool (Business Intelligence)
Demo Time!
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Sample Data warehouse put together using Pentaho (an Open Source Business Intelligence solution)
I Want One!
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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
I Want One!
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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.
I Want One!
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End User Presentation Tools
Business Objects Cognos (Powerplay, Impromptu) Microsoft Business Intelligence Suite Pentaho BI Solution – Open Source Many, many others!
Summary
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DW are used for Decision support Analysis Not the same as your operational systems Designed badly, they are not useful
