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Dw concepts
1.
Data Warehouse
Concepts & Architecture © Principle Partners, Inc. Info@PrinciplePartners.Com Page 1 PP I
2.
Data Warehouse Concepts
Topics To Be Discussed: • Why Do We Need A Data Warehouse ? • The Goal Of A Data Warehouse ? • What Exactly Is A Data Warehouse ? • Comparison Of A Data Warehouse And An Operational Data Store. • Data Warehouse Trends. © Principle Partners, Inc. Info@PrinciplePartners.Com Page 2 PP I
3.
Data Warehouse Concepts
Why Do We Need A Data Warehouse ? We Can Only See - What We Can See ! © Principle Partners, Inc. Info@PrinciplePartners.Com Page 3 PP I
4.
Data Warehouse Concepts
Why Do We Need A Data Warehouse ? BETTER ! FASTER ! FUNCTIONALLY COMPLETE ! CHEAPER ! © Principle Partners, Inc. Info@PrinciplePartners.Com Page 4 PP I
5.
Data Warehouse Concepts
Data Warehouse Development Perspective Data Driven Vs. Function Driven A/P O/P Order Processing Data EIS Data DSS © Principle Partners, Inc. Info@PrinciplePartners.Com Page 5 PP I
6.
Data Warehouse Concepts
What Do We Need To Do ? Use Operational Legacy Systems’ Data: To Build Operational Data Store, That Integrate Into Corporate Data Warehouse, That Spin-off Data Marts. Some May Tell You To Develop These In Reverse! © Principle Partners, Inc. Info@PrinciplePartners.Com Page 6 PP I
7.
Data Warehouse Concepts
Our Goal for A Data Warehouse ? • Collect Data-Scrub, Integrate & Make It Accessible • Provide Information - For Our Businesses • Start Managing Knowledge • So Our Business Partners Will Gain Wisdom ! © Principle Partners, Inc. Info@PrinciplePartners.Com Page 7 PP I
8.
Data Warehouse Concepts
Data Warehouse Definition A Data Warehouse Is A Structured Repository of Historic Data. It Is Developed in an Evolutionary Process By Integrating Data From Non-integrated Legacy Systems. It Is Usually: • Subject Oriented • Integrated • Time Variant • Non-volatile © Principle Partners, Inc. Info@PrinciplePartners.Com Page 8 PP I
9.
Data Warehouse Concepts
Subject Oriented Data is Integrated and Loaded by Subject Cust 1996 1996 Prod D/W Data 1997 O/P 1998 A/R © Principle Partners, Inc. Info@PrinciplePartners.Com Page 9 PP I
10.
Data Warehouse Concepts
Time Variant Operational System Data Warehouse • View of The Business • Designated Time Frame Today (3 - 10 Years) • Operational Time Frame • One Snapshot Per Cycle • Key Need Not Have Date • Key Includes Date © Principle Partners, Inc. Info@PrinciplePartners.Com Page 10 PP I
11.
Data Warehouse Concepts
Integrated Operational Systems Order Processing Order ID = 10 D/W Accounts Receivable Order ID = 12 Order ID = 16 Product Management Order ID = 8 HR System Sex = M/F D/W Payroll Sex = 1/2 Sex = M/F Product Management Sex = 0/1 © Principle Partners, Inc. Info@PrinciplePartners.Com Page 11 PP I
12.
Data Warehouse Concepts
Non-Volatile Operational System Data Warehouse • “CRUD” Actions • No Data Update Insert Read Load Create Read Read Update Replace Read Delete Read © Principle Partners, Inc. Info@PrinciplePartners.Com Page 12 PP I
13.
Data Warehouse Concepts
Data Warehouse Environment Architecture Contains Integrated Data From Multiple Legacy Applications Update A/P Insert Data Load Mart O/P Integration Read ODS Replace Pay Data Criteria Mart All Or Part Delete Mktg Of System of Record Data HR Data Mart A/R D/W Load Loads Best System of Read D/W Record Data © Principle Partners, Inc. Info@PrinciplePartners.Com Page 13 PP I
14.
Data Warehouse Concepts
Meta Data - Map of Integration The Data That Provides the “Card Catalogue” Of References For All Data Within The Data Warehouse System of Record Data Source D/W Structure Source Data Structure Definition Allowable Domains Aliases Data Relationships © Principle Partners, Inc. Info@PrinciplePartners.Com Page 14 PP I
15.
Data Warehouse Concepts
ODS Vs. Data Warehouse Operational Data Store Data Warehouse Characteristics: Data Focused Integration Subject Oriented From Transaction Processing Integrated Focused Systems Non-Volatile Time Variant Age Of The Data: Current, Near Term Historic (Today, Last W eek’s) (Last M onth, Qtrly, Five Years) Primary Use: Day-To-Day Decisions Long-Term Decisions Tactical Reporting Strategic Reporting Current Operational Results Trend Detection Frequency Of Load: Twice Daily , Daily, W eekly W eekly, M onthly, Quarterly © Principle Partners, Inc. Info@PrinciplePartners.Com Page 15 PP I
16.
Data Warehouse Concepts
Building The Data Warehouse Tasks Deliverables • Define Project Scope • Scope Definition • Define Business Reqmts • Logical Data Model • Define System of Record • Physical Database Data Data Model • Define Operational Data • Operational Data Store Store Reqmts Model • Map SOR to ODS • ODS Map • Acquire / Develop • Extract Tools and Extract Tools Software • Extract Data & Load ODS • Populated ODS © Principle Partners, Inc. Info@PrinciplePartners.Com Page 16 PP I
17.
Data Warehouse Concepts
Building The Data Warehouse (Continued) Tasks Deliverables • Define D/W Data Reqmts • Transition Data Model • Map ODS to D/W • D/W Data Integration Map • Document Missing Data • To Do Project List • Develop D/W DB Design • D/W Database Design • Extract and Integrate D/W • Integrated D/W Data Data Extracts • Load Data Warehouse • Initial Data Load • Maintain Data Warehouse • On-going Data Access and Subsequent Loads © Principle Partners, Inc. Info@PrinciplePartners.Com Page 17 PP I
18.
Data Warehouse Concepts
Relationship Among Data Warehouse Data Models Business Business Partner Business Requirements Requirements Knowledge Logical & Wisdom Model Data Warehouse Strategic Validation Business Physical Structured of Current Requirements Model Requirements Data Operational Data Store Physical Tactical Business Data Model Reqmts & Structures Load Current Data Whse Database Requirements Current Structure Physical Transition Model Model © Principle Partners, Inc. Info@PrinciplePartners.Com Page 18 PP I
19.
Data Warehouse Concepts
Sources of Data Warehouse Data Archives (Historic Data) Current Systems of Record (Recent History) Enterprise Data Warehouse Operational Transactions (Future Data Source) © Principle Partners, Inc. Info@PrinciplePartners.Com Page 19 PP I
20.
Data Warehouse Concepts
Appropriate Uses of Data Warehouse Data • Produce Reports For Long Term Trend Analysis • Produce Reports Aggregating Enterprise Data • Produce Reports of Multiple Dimensions (Earned revenue by month by product by branch) © Principle Partners, Inc. Info@PrinciplePartners.Com Page 20 PP I
21.
Data Warehouse Concepts Inappropriate
Uses of Data Warehouse Data • Replace Operational Systems • Replace Operational Systems’ Reports • Analyze Current Operational Results © Principle Partners, Inc. Info@PrinciplePartners.Com Page 21 PP I
22.
Data Warehouse Concepts
Levels of Granularity of Data Warehouse Data •Atomic (Transaction) •Lightly Summarized •Highly Summarized © Principle Partners, Inc. Info@PrinciplePartners.Com Page 22 PP I
23.
Data Warehouse Concepts
Options for Viewing Data • Text 9 0 8 0 7 0 6 0 • 5 0 4 0 3 0 2 0 1 0 0 1 s t 2 n d 3 rd 4 th Q tr Q tr Q tr Q tr • © Principle Partners, Inc. Info@PrinciplePartners.Com Page 23 PP I
24.
Data Warehouse Concepts
Next Steps In Data Warehouse Evolution • Use It - Analyze Data Warehouse Data • Determine Additional Data Requirements • Define Sources For Additional Data • Add New Data (Subject Areas) to Data Warehouse © Principle Partners, Inc. Info@PrinciplePartners.Com Page 24 PP I
25.
Data Warehouse Concepts
Future Trends In Data Warehouse • Increased Data Mining Exploration Prove Hypothesis • Increase Competitive Advantage (i.e., Identify Cross-selling Opportunities) • Integration into Supply Chain & e-Business © Principle Partners, Inc. Info@PrinciplePartners.Com Page 25 PP I
26.
Data Warehouse Concepts
Summary A Data Warehouse Is A Structured Repository of Historic Data. It Is: • Subject Oriented • Integrated • Time Variant • Non-volatile It Contains: • Business Specified Data, To Answer Business Questions © Principle Partners, Inc. Info@PrinciplePartners.Com Page 26 PP I
27.
Data Warehouse Concepts
Questions and Answers © Principle Partners, Inc. Info@PrinciplePartners.Com Page 27 PP I
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