Presentation from Alex Yates (Workingwithdevs.com)

1. The elephant in the room…
…continuous delivery for databases

3. I help people deliver databases…
@_AlexYates_
workingwithdevs.com
uk.linkedin.com/in/alexanderyates
alex.yates@red-gate.com

4.  Agile
 Scrum
 Lean
 Iterative
 Continuous Delivery

5.  Monitoring
 Deployment
 Integrity
 Performance

7. #worksOnMyMachine
Whoa!
Deployment fail!

8. #worksOnMyMachine
A cursor?!
You just can’t do that!

9. #worksOnMyMachine
Hey, you just dropped
my hot-fix!

10. Focus on the pipeline
 Optimize the whole
 Automate processes
 Focus on bottlenecks

11. Odd languages
 SQL
 Cubes
 X-Query
Data persistence
 Data outlives
applications
 Data can’t be
replaced
DBA paranoia
 Frankly…
1 2 3
Databases == Bottleneck

12. #devops
Production
DBA
Chief
Architect
.NET Dev
team lead
(Partners
in crime)
SQL Dev
team lead

13. Reliability
 Safe
deployments
 Fire prevention
over firefighting
Visibility
 Visualise
pipeline
 Better
coordination
DevOps
 DBA + devs
work together
 Automation
 Agility
1 2 3
Goals for project

16. There’s more than one way to skin a cat!

17. V1 V2

18. Migrations based solutions
V1 V2

19. State based solutions
V1 V2

21. “There's nothing more reliable
than keeping track of exactly the
scripts you intend to run, and
running them, without trying to
compare state and guess.”
Paul Stovell, built Octopus Deploy

22. “There's nothing more reliable
than keeping track of exactly the
scripts you intend to run, and
running them, without trying to
compare state and guess.”
Paul Stovell, built Octopus Deploy
“As soon as you have multiple changes
on a single aspect of an object, ordering
and the ability to detect which change
needs to be made gets very
complicated.”
Gert Drapers, built DataDude

23. Demo: the happy path!
SOURCE
CONTROL
CONTINUOUS
INTEGRATION
AUTOMATED
DEPLOYMENT

24. 11
2 Table rename
 Table ‘foo’ is to be renamed ‘bar’
Edit stored procedure
 Myproc to select col2 from table ‘foo’
(currently it selects only col1)
Task

26. 0124_edit_sproc.sql
ALTER PROCEDURE
myproc
AS
BEGIN
SELECT col1, col2
FROM table_foo
END

27. 0124_edit_sproc.sql 0125_table_rename.sql
EXEC sp_rename
'table_foo',
'table_bar‘
ALTER PROCEDURE
myproc
AS
BEGIN
SELECT col1
FROM table_bar
END
ALTER PROCEDURE
myproc
AS
BEGIN
SELECT col1, col2
FROM table_foo
END

28. 0124_edit_sproc.sql 0125_table_rename.sql
EXEC sp_rename
'table_foo',
'table_bar‘
ALTER PROCEDURE
myproc
AS
BEGIN
SELECT col1
FROM table_bar
END
ALTER PROCEDURE
myproc
AS
BEGIN
SELECT col1, col2
FROM table_foo
END
!

29. Conflicts easily missed
 Changes overwritten
Order matters
 Last script wins
To review changes
 Much reading, but very
important to get code right
The problem with migrations

30. V123
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1
FROM table_foo
!

31. V123
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1
FROM table_foo
V124
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1, col2
FROM table_foo

32. V123
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1
FROM table_foo
V124
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1, col2
FROM table_foo
V125
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1
FROM table_bar

33. V123
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1
FROM table_foo
V124
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1, col2
FROM table_foo
V125
myproc.sql
CREATE PROCEDURE
myproc
AS
SELECT col1
FROM table_bar
!

35. REVISION 123 REVISION 124
table_foo.sql
CREATE TABLE table_foo
(col1 NVARCHAR(max), col2
NVARCHAR(max))
myproc.sql
CREATE PROCEDURE myproc
AS
SELECT col1
FROM table_foo
table_bar.sql
CREATE TABLE table_bar
(col1 NVARCHAR(max), col2
NVARCHAR(max))
myproc.sql
CREATE PROCEDURE myproc
AS
SELECT col1, col2
FROM table_bar

36. Diff script:
DROP TABLE table_foo
CREATE TABLE table_bar
(col1 NVARCHAR(max), col2
NVARCHAR(max))
ALTER PROCEDURE myproc
AS
SELECT col1, col2 FROM table_bar
The problem with state

37. Diff script
DROP TABLE table_foo
CREATE TABLE table_bar
(col1 NVARCHAR(max), col2
NVARCHAR(max))
ALTER PROCEDURE myproc
AS
SELECT col1, col2 FROM table_bar
!
The problem with state

38. Script
DROP TABLE table_foo
CREATE TABLE table_bar
(col1 NVARCHAR(max),
col2 NVARCHAR(max))
ALTER PROCEDURE myproc
AS
SELECT col1, col2
FROM table_bar
Need to understand your tool
 It should be obvious to you that
your tool won’t work
What is the Plan B / override?
 Because one day you’ll need it
Test for data loss
 Automatically (naturally)
The problem with state

39. One more thing…

41. State
 Easier (less control)
 Better for sprocs/functions
 Better for large/distributed teams
 Better for frequent changes
 Better for dependency nightmares
 Drift: rolled back
Migrations
 More control (harder/needs discipline)
 Better for data migrations
 Better for small teams
 Better for infrequent changes
 Better for simple data stores
 Drift: ignored
So what is better?

42. State (+migrations)
 SSDT pre/post deploy scripts
 Redgate migrations
Migrations (+state)
 ReadyRoll ‘deploy changes’
Best of both worlds?

44. Reliability
 Safe
deployments
 Fire prevention
over firefighting
1
Goals for project

46. Reliability
 Safe
deployments
 Fire prevention
over firefighting
Visibility
 Visualise
pipeline
 Better
coordination
1 2
Goals for project

47. Reliability
 Safe
deployments
 Fire prevention
over firefighting
Visibility
 Visualise
pipeline
 Better
coordination
DevOps
 DBA + devs
work together
 Automation
 Agility
1 2 3
Goals for project

49. @_AlexYates_
workingwithdevs.com
uk.linkedin.com/in/alexanderyates
alex.yates@red-gate.com

50. Image sources
Author Source Information
Chiltepinster Wikimedia Commons Mocking Bird Argument.jpg – Wikimedia Commons. This file is licensed under the Creative Commons Attribution-Share
Alike 3.0 Unported license. Source on Wikimedia Commons: “Own work”
Tableatny Wikimedia Commons Athlete at Starting block.jpg – Wikimedia Commons. This file is licensed under the Creative Commons Attribution 2.0
Generic license. Source on Wikimedia Commons: “BXP135671”
Henry Mühlpfordt Flickr CERN Atlas Control Room 2010-07-01 – Flickr. This file is licensed under the Creative Commons Attribution-ShareAlike 2.0
Generic license.
Department for Business,
Innovation and Skills
Flickr Toyota’s new Auris – Flickr. This file is licensed under the Creative Commons Attribution-NoDerivs 2.0 Generic license.
Stephen Wolfe Flickr Violinists – Flickr. This file is licensed under the Creative Commons Attribution 2.0 Generic license.
Akira Hsu Flickr The Micro Four Thirds Logo by Empire Elite Stormtroopers - for the great “Micro Four Thirds Day” – Flickr. This file is
licensed under the Creative Commons Attribution 2.0 Generic license.
Nils Rinaldi Flickr Hippo fight 2/3 – Flickr. This file is licensed under the Creative Commons Attribution 2.0 Generic license.
My own collection All pictures are either of me,
taken by friends/colleagues, or
taken by me
All pictures on about me slide, including kitten, and team at Farm Credit Services of America (FCSA). FCSA have allowed
me/Redgate to reference the visit in presentations/marketing material etc.
Memegenerator.net Memegenerator.net I don’t always edit database. Content designed to be shared and delivered with credit to memegenerator.net.
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