The presentation held at the 28th International Conference on Conceptual Modeling.

1. AnchorModeling An Agile Modeling Technique using the Sixth Normal Form for Structurally and Temporally Evolving Data Lars Rönnbäck[ER09]

2. 2 “You can never step into the same river twice.”

3. Olle Regardt Lars Rönnbäck Maria Bergholtz PetiaWohed Paul Johannesson EVERYONE DW MDM EDW TDWI CC WWW KTH/SU DW ER09 DW 2008 2003 2004 2005 2006 2007 2009

4. Entity Relationship Modeling Sixth Normal Form Temporal Databases

5. ANCHORS KNOTS Gender CustomerClass HouseholdOwner VisitingFrequencyInterval Customer Store Purchase Item PriceList Inventory TIES Customer_Address Customer_Household Card_Customer CustomerDateOfBirth CustomerNumber CustomerName CustomerGender ATTRIBUTES

6. ANCHORS KNOTS select top 5 * from GEN_Gender select top 5 * from CU_Customer Attributes and ties come in fourflavors, historized or staticcombined with knotted ATTRIBUTES TIES select top 5 * from CUDOB_CustomerDateOfBirth select top 5* from CUHH_Customer_Household

7. Model Evolution 1 2 3 4 5 All previous versions of the schema are present and werenevermodified, allowing extensions to be made ”online”.

8. LatestView Point-in-TimeFunction Joins all attributes and finds the attributerow with the latestFromDateearlier or on the given timepointifhistorized Joins all attributes and finds the attributerow with the latestFromDateifhistorized

9. The queryexecution plan shows that onlytwotables are touched (the anchor and the selectedattribute)despite of the fact that severalothers are joinedinto the viewwe are using.

10. Table Elimination The query optimizer will remove table T from the execution plan of a query if the following two conditions are fulfilled: no column from T is explicitly selected the number of rows in the returned data set is not affected by the join with T Support Microsoft SQL Server Oracle IBM DB2 PostgreSQL MariaDB (fork of MySQL) Teradata (partial)

12. For unknownindividuals

13. Create and associatesurrogatekeys

15. If this is a delta file, directlyinsert data into all relevant tables

16. If this is not a delta file, check if the value in the sourcediffers from the latestvalue in the destination and insertif the data is new(fewtablesexcluding the anchor) Data loadingtemplatescan be made in whichonly the names of the tables and the join with the natural key have to be changed.

17. Ease of Modeling Simple concepts and notation Historization by design Iterative and incrementaldevelopment Reducedtranslationlogic SimplifiedMaintenance Ease of temporal querying Absence of null values Reusability and automation Asynchronous arrival of data High Performance High run-time performance Efficientstorage Parallelized physical media access www.anchormodeling.com