Ensemble Modeling and Data Vault 2014
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Data Modeling for the Agile Data Warehouse means breaking down business concepts into lower level tables. This process of Unified Decomposition results in concept Ensembles - like the popular Data Vault modeling approach.
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Ensemble Modeling and Data Vault 2014
- 1. Data Vault Modeling DW2.0 & Unstructured Data Big Data Ensemble Modeling Agile DW Ensemble Modeling & Data Vault © 2014 Genesee Academy, LLC USA +1 303 526 0340 Sweden 072 736 8700 Hans@GeneseeAcademy.com www.GeneseeAcademy.com 2014
- 2. Ensemble Modeling & Data Vault AGENDA About Hans Hultgren: Ensemble Modeling &Unified Decomposition Data Vault Ensemble Colors of Data Vault Data Vault Hubs, Links and Satellites • More Information • • • • • gohansgo Author, Advisor, Speaker & Industry Analyst; President Genesee Academy LLC, Principal at Book available on Amazon.com © 2014 Genesee Academy, LLC 2
- 3. A Saga of Data Warehousing Once upon a time data warehousing was becoming more popular and everyone was eager to build their own. But whenever they tried they failed. They called upon their best to fix this but they just couldn’t solve the problem. They discovered that meeting the needs of the data warehouse meant that the tables got too big and too hard to work with. They just could not handle changes over time. If the smallest thing changed it always meant they had to change the entire table. When just a single attribute was updated they had to insert a record for all of the attributes. All seemed lost. But around the world there were rebels who questioned the conventional wisdom. And their voices were finally heard: Why not separate the things that change from the things that don’t change? © 2014 Genesee Academy, LLC 3
- 4. Ensemble Modeling™ • The constellation of component parts acts as a whole – an Ensemble. All the parts of a thing taken together, so that each part is considered only in relation to the whole. • With Ensemble Modeling the Core Business Concepts that we define and model are represented as a whole – an ensemble – including all of the component parts. © 2014 Genesee Academy, LLC 4
- 5. Based on Unified Decomposition™ • With the EDW, we break things out into parts for flexibility, agility, and generally to facilitate the capture of things that are either interpreted in different ways or changing independently of each other. • At the same time a core premise of data warehousing is integration and moving to a common standard view of unified concepts. So we also want to tie things together – Unify. © 2014 Genesee Academy, LLC 5
- 6. THE DATA VAULT ENSEMBLE: APPLYING THE ENSEMBLE © 2014 Genesee Academy, LLC 6
- 7. The Data Vault Ensemble • The Data Vault Ensemble conforms to a single key – embodied in the Hub construct. • The component parts for the Data Vault Ensemble include: – Hub The Natural Business Key – Link The Natural Business Relationships – Satellite All Context, Descriptive Data and History © 2014 Genesee Academy, LLC 7
- 8. The Data Vault modeling approach 3NF Data Vault HUB SAT LINK Entity Dimensional SAT Dim Core Concept Business Keys Associations / Relationships Details / Context © 2014 Genesee Academy, LLC 8
- 9. Modeling Comparison Start Schema and Snow Flake Models: Region Store Customer Sale Fact Associations Business Keys Details Product Facts contain all three types of data… Employee Vendor Dimensions can also contain all types *** Requires complex loading routines for key dependencies… © 2014 Genesee Academy, LLC 9
- 10. Modeling Comparison 3rd Normal Form has the same issue: each construct – or Entity – typically contains a business key, one or more associations and also details (context, descriptive data)… Region Customer Store Sale Sale LI Employee Product Vendor © 2014 Genesee Academy, LLC 10
- 11. Colors of the Data Vault Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Region Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Employee Customer Sat Sat Link Store Link Sat Sat Sat Sat Sat Sat Sat Link Sat Sat Product Sale Link Sat Sat Vendor Sat Sat Sat © 2014 Genesee Academy, LLC Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat Sat 11
- 12. Data Vault means thinking differently • The minimal construct then for an “entity” such as “Customer” is now a Customer Hub with a set of Satellites Customer © 2014 Genesee Academy, LLC 12
- 13. Data Vault Modeling Process • The Modeling Process for creating a Data Vault model includes three primary steps: 1) Identify and Model your Core Business Concepts • Business Interviews is at the heart of this step What do you do? What are the main things you work with? • Also find best/target Natural Business Key 2) Identify and Model your Natural Business Relationships • Specific Unique Relationships • Be considerate of the Unit of Work and Grain 3) Analyze and Design your Context Satellites • Consider Rate of Change, Type of Data and also the Sources of your data during design process © 2014 Genesee Academy, LLC 13
- 14. Hubs – A Hub Construct in Data Vault • contains Business Key • only the Business Key • contains No Context • is always 1:1 with EWBK H_Customer H_Customer_SID Business Key Date/Time Stamp Record source – A Hub Table contains only • Business Key • Surrogate Key (Data Warehouse) • Load Date / Time Stamp • Record Source © 2014 Genesee Academy, LLC 14
- 15. Links H_Customer – A Link Construct in Data Vault • contains Relationship • only a Relationship • contains No Context • is always 1:1 with Relationship – A Link Table contains only • 2-n FKs for the Relationship • Surrogate Key (Data Warehouse) • Load Date / Time Stamp • Record Source © 2014 Genesee Academy, LLC H_Customer_SID Business Key Date/Tim e Stamp L_Cust_Class Record source L_Cust_Class_SID H_Customer_SID H_Sequence2_SID Date/Time Stamp Record source – Unique – Specific – Natural Business Relationship 15
- 16. Satellites – A Satellite Construct in Data Vault • contains Context only • has no FKs (no relationships) • Designed by * Rate of Change * Type of Data * System… S_Customer H_Customer_SID Date/Time Stamp Context A Context B Context C Context D – A Satellite Table contains only • Business Key FK + • Load Date / Time Stamp • Context Data… • Record Source © 2014 Genesee Academy, LLC Record source H_Customer H_Customer_SID Business Key Date/Tim e Stamp Record source 16
- 17. About Data Vault Ensemble Estimated 800 Data Vault based Data Warehouses around the world © 2014 Genesee Academy, LLC 17
- 18. Links and Information CDVDM Training & Certification www.GeneseeAcademy.com Hans@GeneseeAcademy.com gohansgo Book DataVaultBook.blogspot.com HansHultgren.WordPress.com HansHultgren DataVaultAcademy Online video-lesson training DataVaultAcademy.com © 2014 Genesee Academy, LLC 18