The document discusses the expand-contract pattern in continuous delivery for databases and highlights techniques such as branch by abstraction and database refactoring. It emphasizes the importance of low-risk releases through incremental changes and small batch deployments. Key references and links to further reading on the topics are provided.

1. Expand Contract
Pattern
Continuous Delivery for Databases
@leenasn

2. A few years back

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

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

8. Database?

9. Slow

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

11. Less risky?

12. Database Refactoring

13. 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.

14. Split Column
customer
booking_date
status
trial_bookings

15. Migration

16. New Schema

17. Refactoring Process

18. Split table

19. Migration Time

20. New Schema

21. Refactoring Process

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

23. Expand

25. Contract

26. Basics

27. Versioning

28. Golden gate bridge safety first
Tests

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

30. Principles of low risk releases

31. Incremental

32. Done

33. Decouple deploy from release

34. Small Batches

36. References
https://medium.com/continuousdelivery/split-table-a-database-refactoring-techni
que-5dec00449e51
https://medium.com/@leenasn/continuous-delivery-for-database-eabd7f280019
https://medium.com/@leenasn/expand-contract-pattern-and-continuous-delivery
-of-databases-4cfa00c23d2e
http://databaserefactoring.com/
http://www.informit.com/articles/article.aspx?p=1833567

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