1. Data Management
& Warehousing
http://www.datamgmt.com
An introduction to
Process Neutral
Data Modelling
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 1 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

2. Data Management & Warehousing
•! Founded 1995 by David Walker
–! Operates with up to 15 consultants
•! Specialists in Enterprise Data Warehousing
•! Clients have included:
–! Manufacturing: Diageo, Mars ISI
–! Retail: Albert Heijn, Nectar
–! Financial: Virgin Money
–! Transport: Network Rail, Swissair
–! Telco: Turkcell, Swisscom Mobile, Telkom SA
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 2 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

3. What is Process Neutral Modelling ?
•! A method of designing a data model for a data
warehouse that is less affected by changes in
source system and/or business process
•! A technique that incorporates the metadata
within the data model (in a similar way to XML
which incorporates metadata in a data file)
•! A consistent, self similar modelling method that
allows easy model management in data
warehouses
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 3 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

4. Where would you use it ?
•! Data Warehouses that:
–! Feed multiple data marts
–! Have many source systems that are poorly integrated
–! Are in organisations undergoing large business process change
–! Support a recognised need for integrated business intelligence
•! But not in organisations that:
–! are small and can’t afford Enterprise Data Warehousing
–! have a few or one source system with little external data
–! have very stable business processes
–! want to build an Online Transaction Processing (OLTP) Systems
for reporting
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 4 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

5. Overcomes Some DWH Requirements Issues
•! Stops the need to closely define certain things
from the requirements in the data model e.g.
•! Define CUSTOMER
–! Marketing say it is everyone they communicate with
–! Sales say it is everyone in their prospect database.
–! Customer Support say it is people who have bought
the product
–! Service Team say it is people who have a support
contract
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 5 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

6. Major Entities
•! Rules
–! Lifetime value attributes
only
–! Always has a start date
and an optional end date
•! Examples
–! Party
–! Geography
–! Calendar
–! Electronic Address
–! Product
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 6 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

7. Major Entity Types
•! Rules
–! List of valid types and when they are valid (metadata)
•! Examples
–! Party
•! Individual, Sole Trader, Partnership, Ltd Co, Plc, Trust
–! Geography
•! PAF Address, Co-ordinate Point
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 7 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

8. Major Entity Properties
•! Rules
–! Attributes of the Major Entity that
change over time listed in the ‘Type
table’ and their association with the
major entity
•! Examples
–! Party
•! Individual: Marital Status, Income
•! Plc: Turnover, Number of employees
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 8 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

9. Major Entity Events
•! Rules
–! Things that happen to a
major entity
•! Examples
–! Party
•! Individual: Marriage
–! Address
•! Change of use approved
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 9 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

10. Major Entity Links
•! Rules
–! Relates to entries in a major
entity, and relationship is
defined by the type table
•! Examples
–! Party
•! Individual 1 is married to
individual 2
•! Individual 1 is employed by
Organisation 3
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 10 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

11. Major Entity Segments
•! Rules
–! Creates a collection of entries from a
major entity
•! Examples
–! Party
•! Marketing Group 1: Males >40 with 1 or
more children (data derived from the
other tables, e.g. properties and links)
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 11 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

12. The Major Entity Collection
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 12 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

13. Major Entity / Major Entity History
•! Rules •! Examples
–! Relates two –! Party / Address
different major •! Individual 1 lives at
entities via a Address 2
history type •! Individual 3 works at
Address 4
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 13 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

14. Occurrences and Major Entities
•! Rules •! Examples
–! These are the –! Sales
tables with define •! Party 1 is supplier
interactions •! Party 2 is the
between all the customer
major entities •! Address 3 is the
store location
•! Product 4 is item
purchased
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 14 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

15. Key Elements
•! Self Similar modelling
–! All _TYPE tables have the same structure, etc.
–! Naming conventions are consistent everywhere
•! Insert ‘heavy’ / Update ‘light’
–! Most ETL will result in an insert, there will be very few updates
•! Manages ‘Slowly Changing Dimensions’
–! Inherent in the Major Entity Collection
–! Significantly reduces overhead in the Data Mart build
•! Data Driven
–! Types provide metadata
•! Natural Star Schemas
–! Occurrences will map to FACTS, Major Entity Collections will
collapse into DIMENSIONS
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 15 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

16. Pros & Cons
•! Development Cost front-loaded
–! Most of the costs are in the early part of the (ETL)
development, later stages are then quicker and faster.
This will put some organisations off
•! Pivoting Data vs. Slowly Changing Dimensions
–! Questions about the cost of loading ‘property tables’
and ‘pivoting’ data. In reality this is easily offset by the
extra code and effort of managing slowly changing
dimensions
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 16 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

17. Pros & Cons (cont.)
•! Two stage process: Source -> TR - Mart
–! Design patterns exist to mitigate this
–! Allows loading whilst users continue to work
–! Allows for the development of flip-flop marts
•! Larger Initial Data Volumes
–! But smaller over the long term due to data sparsity
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 17 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

18. Is this all there is to it ?
•! At a high level – YES
•! BUT:
–! There are methods for dealing with data quality
–! Special case methods for some lifetime attributes
•! e.g. Handling women changing their names at marriage
–! Insert/Update methods for performance
–! Design Patterns for implementation
–! Other detailed techniques
•! This talk could only ever be:
“An introduction to
Process Neutral Data Modelling”
© 2006 Data Management & Warehousing UKOUG: Business Intelligence & Reporting Tools SIG Page 18 of 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006

19. Data Management & Warehousing
Thank you !
•! For more information:
–! Visit our website at http://www.datamgmt.com
–! Call us on 07050 028 911
–! E-mail davidw@datamgmt.com
Winning Teams - Great Team Players
Data Management & Warehousing are proud player sponsors for the 2005/06 season of
Joe Worsley, utility back row with the English Rugby Premiership Champions London Wasps.
Joe has helped London Wasps win the Zurich Premiership in 2002-03, 2003-04 and 2004-05
©as wellManagement Heineken Cup in 2003-04. Joe was alsoReporting Tools SIG of the England World Cup squad of 19
2006 Data as the & Warehousing UKOUG: Business Intelligence & a member Page 19
Speaker: David M. Walker Institute of Physics, 76 Portland Place, London 31 January 2006
and was awarded an MBE by the Queen.