How to Use Parameters Like a Pro and Boost Performance, a presentation by Guy Glantser to SQLRally Nordic 2015 in Copenhagen

1. How to Use Parameters Like a Pro
and Boost Performance

3. How to Use Parameters Like a Pro
and Boost Performance

4. Name: Guy Glantser
Email Address: guy@madeira.co.il
Twitter: @guy_glantser
Blog: www.madeirasql.com/author/guyglantser
Podcast: www.sqlserverradio.com
Image courtesy of Mister GC / FreeDigitalPhotos.net

5. Let’s Begin
with a Story…

6. What is Parameterization?
Image courtesy of iosphere / FreeDigitalPhotos.net

7. Why is it So Important?
Image courtesy of iosphere / FreeDigitalPhotos.net

8. When does it Become
Problematic?
Image courtesy of iosphere / FreeDigitalPhotos.net

9. How can we Deal with it?
Image courtesy of iosphere / FreeDigitalPhotos.net

10. SELECT
ProductName ,
ProductCategory
FROM
Production.Product
WHERE
ProductID = 17;

11. SELECT
ProductName ,
ProductCategory
FROM
Production.Product
WHERE
ProductID = 17;

12. SELECT
ProductName ,
ProductCategory
FROM
Production.Product
WHERE
ProductID = 63;

13. SELECT
ProductName ,
ProductCategory
FROM
Production.Product
WHERE
ProductID = @ProductID;

14. Image courtesy of Salvatore Vuono / FreeDigitalPhotos.net

15. SELECT
Id ,
Name ,
LastPurchaseDate
FROM
Marketing.Customers
WHERE
Country = N'DK';

16. Image courtesy of Gualberto107 / FreeDigitalPhotos.net

19. Image courtesy of Stuart Miles / FreeDigitalPhotos.net

20. Image courtesy of Stuart Miles / FreeDigitalPhotos.net

21. Image courtesy of Stuart Miles / FreeDigitalPhotos.net
Is Parameter Sniffing
Good or Bad?

22. Image courtesy of Salvatore Vuono / FreeDigitalPhotos.net

23. Image courtesy of Salvatore Vuono / FreeDigitalPhotos.net

27. Database Level Query Template Level
Image courtesy of Stuart Miles & Master isolated images / FreeDigitalPhotos.net

28. Image courtesy of stockimages / FreeDigitalPhotos.net

29. Image courtesy of stockimages / FreeDigitalPhotos.net

30. Image courtesy of stockimages / FreeDigitalPhotos.net
Tip #1
Usually, data distribution is
more or less uniform, so, in
general, prefer parameterized
queries over non-
parameterized queries.

31. Image courtesy of stockimages / FreeDigitalPhotos.net
Tip #2
When data is not uniformly
distributed, rewrite your code
using one of the methods
shown in this session.

32. Image courtesy of stockimages / FreeDigitalPhotos.net
Tip #3
Avoid the use of local
variables as an alternative for
parameters.
Use parameters instead.

33. Image courtesy of stockimages / FreeDigitalPhotos.net
Tip #4
Don’t change parameter
values inside your stored
procedures.
Pass the calculated values to
inner stored procedures to
use parameter sniffing.

34. Image courtesy of stockimages / FreeDigitalPhotos.net
Tip #5
Force parameterization only
when you have no other
choice.
Prefer forced
parameterization at the
query template level.

35. Back to the Story…

36. http://www.madeirasql.com/tag/parameterization-series/
Image courtesy of Stuart Miles / FreeDigitalPhotos.net

37. Image courtesy of Master isolated images / FreeDigitalPhotos.net

38. Explore Everything PASS Has to Offer
Free SQL Server and BI Web Events Free 1-day Training Events Regional Event
Local User Groups Around
the World
Free Online Technical Training
This is Community Business Analytics Training
Session Recordings PASS Newsletter

39. Image courtesy of David Castillo Dominici / FreeDigitalPhotos.net

40. Name: Guy Glantser
Email Address: guy@madeira.co.il
Twitter: @guy_glantser
Blog: www.madeirasql.com/author/guyglantser
Podcast: www.sqlserverradio.com
Image courtesy of Mister GC / FreeDigitalPhotos.net