The document discusses the concepts of database refactoring and continuous delivery, emphasizing the importance of small, behavior-preserving changes to improve database design without altering its functionality. It outlines various types of refactoring, including structural and data quality refactoring, and highlights the role of refactoring in enabling continuous delivery and supporting evolutionary development. The principles of low-risk releases and strategies for implementing changes in database schemas are also mentioned.

1. Expand Contract
Pattern
Continuous Delivery for Databases
@leenasn

2. A few years back
https://pixabay.com/en/art-watercolors-arts-and-crafts-1851483/

3. https://pixabay.com/en/change-new-beginning-renewal-673006/

6. https://martinfowler.com/bliki/BranchByAbstraction.html
Branch by Abstraction

7. https://martinfowler.com/books/refactoring.html
Refactoring is a controlled technique for improving
the design of an existing code base. Its essence is
applying a series of small behavior-preserving
transformations, each of which "too small to be worth
doing".
However the cumulative effect of each of these
transformations is quite significant.
Refactoring

8. https://continuousdelivery.com/
Ability to get changes of all types—including new
features, configuration changes, bug fixes and
experiments—into production, or into the hands of
users, safely and quickly in a sustainable way.
Continuous Delivery

9. https://pixabay.com/en/white-male-isolated-3d-model-1740708/

10. Yoga Tree
Digital Marketing for Yoga Centres
getyogatree.com

11. Evolvability https://pixabay.com/en/juggle-artists-circus-money-1027844/

12. Database? https://pixabay.com/

13. https://unsplash.com/photos/elayN_YscVg
Slow

14. High risk https://pixabay.com/en/balance-risk-courage-risky-3062272/

15. Less risky? https://pixabay.com/

16. A database refactoring is a small change to
your database schema (the table structures,
data itself, stored procedures, and triggers)
which improves its design without changing its
semantics.
http://databaserefactoring.com/

17. ● Enables Continuous Delivery
● Supports evolutionary development
http://databaserefactoring.com/

18. https://www.dreamstime.com/stock-photos-example-stamp-image28420393

19. Split Column
customer
booking_date
status
trial_bookings

20. Transition

21. New Schema

22. Refactoring Process

23. Split table

24. Transition

25. New Schema

26. Refactoring Process

27. https://martinfowler.com/articles/evodb.html
Expand Contract

28. Types of Refactoring
★ Structural Refactoring
★ Data Quality Refactoring
★ Referential Integrity Refactoring
★ Transformation
★ Architectural Refactoring
★ Method Refactoring

29. https://www.dreamstime.com/abcs-color-colorful-wooden-blocks-image139644010Basics

30. Versioning https://git-scm.com/downloads/logos

31. http://demographicwinter.org/automation-gears-8231/
Automation

32. https://pixabay.com/en/strategy-arrows-building-startup-3224515/

33. Transition period https://pixabay.com/photos/bridge-iron-old-pedestrian-metal-3181356/

34. https://pixabay.com/vectors/debt-eliminate-loan-deficit-payoff-37557/

36. Murphy’s Law https://www.flickr.com/photos/smemon/5471883005

37. Low risk releases https://pixabay.com/en/button-red-round-shiny-155149/

38. Small reversible stepshttps://www.slideshare.net/jallspaw/ops-metametrics-the-currency-you-pay-for-change

39. References

40. References
Split Table - Database Refactoring
Continuous Delivery of Databases
Expand Contract Pattern - Continuous Delivery of Databases
Database Refactoring
Four Principles of Low-Risk Software Releases
Branch by Abstraction
Move Fast @ Github

41. Leena S N
@leenasn / leena.sn@multunus.com
https://medium.com/@leenasn