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Data Warehouse Modeling

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Data Warehouse Modeling Thijs Kupers Vivek Jonnaganti
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Introduction
The Evolution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is a Data Warehouse? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is a Data Warehouse? (cont’d) ,[object Object],[object Object]
Data Warehouse Goals/Characteristics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Warehouse Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Warehouse Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Warehouse Sizes ,[object Object],[object Object],[object Object],[object Object],[object Object]
Data Warehousing Concepts
Data Warehouse (OLAP) and OLTP
Data Warehouse Architecture Enterprise Data Warehouse Data Mart Data Mart ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Data and Metadata Repository Layer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Presentation Layer ETL Layer Operational Source Systems Technologies: Metadata Repository ODS ,[object Object],[object Object],[object Object],[object Object],[object Object],Data Mart
Data Warehouse Structure Highly Summarized Lightly Summarized Atomic/Detailed Departmentally Structured Individually Structured Data Warehouse Organizationally Structured Data Information
Data Warehouse Architecture Drivers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Mart Centric Data Marts Data Sources Data Warehouse
Data Mart Centric If you end up creating multiple warehouses, integrating them is a problem
Data Warehouse Centric Data Marts Data Sources Data Warehouse
OLAP
OLAP: 3 Tier DSS Data Warehouse Database Layer Store atomic data in industry standard Data Warehouse. OLAP Engine Application Logic Layer Generate SQL execution plans in the OLAP engine to obtain OLAP functionality. Decision Support Client Presentation Layer Obtain multi-dimensional reports from the DSS Client.
OLAP Servers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
OLAP Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Strengths of OLAP ,[object Object],[object Object],[object Object],[object Object],[object Object]
Dimensional Modeling
What is Dimensional Modeling? ,[object Object],[object Object],[object Object]
DM v/s ER Models DM ER Used to design database for Online Analytical Processing (OLAP) Used to design database for Online Transaction Processing (OLTP) Support ad hoc end-user queries Support defined queries Intuitive & facilitates high-performance retrieval of data Removes redundancy of data De-normalized Normalized
Fact Tables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dimension Tables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Four Step Dimensional Design Process ,[object Object],[object Object],[object Object],[object Object]
Four Step Dimensional Design Process (cont’d) ,[object Object],[object Object],[object Object],[object Object]
Classic Star Schema Model
Snowflake Schema
Fact Constellation Schema
Slowly Changing Dimensions ,[object Object]
Slowly Changing Dimensions (cont’d) ,[object Object],[object Object]
Conceptual Modeling
Graph Theory ,[object Object],[object Object]
The Dimensional Fact Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Dimensional Fact Model
Why Formalize?
Why Formalize? ,[object Object],[object Object],[object Object],[object Object]
Fact Scheme ,[object Object],[object Object],[object Object],[object Object]
Fact Scheme ,[object Object],[object Object]
Fact Scheme ,[object Object]
Fact Scheme
Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sample Schema
Define Facts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Transform Relation
Build Attribute Tree ,[object Object],[object Object]
Build Attribute Tree ,[object Object],[object Object]
Build Attribute Tree ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Attribute Tree
Attribute Tree ,[object Object],[object Object],[object Object]
From ER till Conceptual Design ,[object Object],[object Object],[object Object],[object Object],[object Object]
Prune & Graft ,[object Object],[object Object],[object Object]
Graft ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Graft ,[object Object],[object Object]
Prune & Graft
Prune & Graft
Dimensions ,[object Object],[object Object],[object Object],[object Object]
Measures ,[object Object],[object Object],[object Object],[object Object]
Hierarchies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Aggregation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Aggregation ,[object Object],[object Object]
Multi-Aggregation
Multi-Aggregation ,[object Object],[object Object],[object Object],[object Object]
Multi-Aggregation
Multi-Aggregation
 
 
 
 
 
 
Indexing
Cost Model ,[object Object],[object Object],[object Object]
Cost Model
Indexes ,[object Object],[object Object],[object Object],[object Object]
Example ,[object Object],[object Object],[object Object],[object Object],[object Object]
Indexes ,[object Object],[object Object],[object Object]
Algorithms ,[object Object],[object Object],[object Object],[object Object]
?
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
References (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
References (cont’d) ,[object Object],[object Object],[object Object],[object Object]

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Data Warehouse Modeling