SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Optimizing a cursor based routine – Part 1


Optimizing a cursor based routine – Part 1

Author
Message
Dave Ballantyne
Dave Ballantyne
Hall of Fame
Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)

Group: General Forum Members
Points: 3732 Visits: 8370
Comments posted to this topic are about the item Optimizing a cursor based routine – Part 1



Clear Sky SQL
My Blog
SQLRNNR
SQLRNNR
SSC-Forever
SSC-Forever (40K reputation)SSC-Forever (40K reputation)SSC-Forever (40K reputation)SSC-Forever (40K reputation)SSC-Forever (40K reputation)SSC-Forever (40K reputation)SSC-Forever (40K reputation)SSC-Forever (40K reputation)

Group: General Forum Members
Points: 40275 Visits: 18565
Nice Job Dave.



Jason AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server, MVP


SQL RNNR

Posting Performance Based Questions - Gail Shaw

Dave Ballantyne
Dave Ballantyne
Hall of Fame
Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)Hall of Fame (3.7K reputation)

Group: General Forum Members
Points: 3732 Visits: 8370
Thanks Jason,

It was a long hard slog to get it to this point.

Glad you enjoyed it

FYI : Part 2 is now active here http://www.sqlservercentral.com/articles/T-SQL/73889/



Clear Sky SQL
My Blog
Ken Wymore
Ken Wymore
SSCertifiable
SSCertifiable (5.5K reputation)SSCertifiable (5.5K reputation)SSCertifiable (5.5K reputation)SSCertifiable (5.5K reputation)SSCertifiable (5.5K reputation)SSCertifiable (5.5K reputation)SSCertifiable (5.5K reputation)SSCertifiable (5.5K reputation)

Group: General Forum Members
Points: 5481 Visits: 2382
Nice article, well written, very informational, good explanations. I look forward to future articles from you.
wbrianwhite
wbrianwhite
SSC-Enthusiastic
SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)

Group: General Forum Members
Points: 160 Visits: 152
I'm not sure why you're keeping this in a cursor at all. The report looks simple enough to just write the entire report as a big select statement. Which will be an order of magnitude faster than a cursor.
GilaMonster
GilaMonster
SSC Guru
SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)

Group: General Forum Members
Points: 114313 Visits: 45487
For simplicity of example?

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


LutzM
LutzM
SSChampion
SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)

Group: General Forum Members
Points: 12807 Visits: 13559
Great article, Dave! Very well done!



Lutz
A pessimist is an optimist with experience.

How to get fast answers to your question
How to post performance related questions
Links for Tally Table , Cross Tabs and Dynamic Cross Tabs , Delimited Split Function
WayneS
WayneS
SSChampion
SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)

Group: General Forum Members
Points: 12199 Visits: 10601
wbrianwhite (6/28/2011)
I'm not sure why you're keeping this in a cursor at all. The report looks simple enough to just write the entire report as a big select statement. Which will be an order of magnitude faster than a cursor.


Surely you did notice that this article is "Part 1"? I would suspect that "Part 2" takes care of that! ;-)

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

WayneS
WayneS
SSChampion
SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)SSChampion (12K reputation)

Group: General Forum Members
Points: 12199 Visits: 10601
Excellent Dave. I really like the progression you take for resolving this.

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

wbrianwhite
wbrianwhite
SSC-Enthusiastic
SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)SSC-Enthusiastic (160 reputation)

Group: General Forum Members
Points: 160 Visits: 152
WayneS (6/28/2011)
wbrianwhite (6/28/2011)
I'm not sure why you're keeping this in a cursor at all. The report looks simple enough to just write the entire report as a big select statement. Which will be an order of magnitude faster than a cursor.


Surely you did notice that this article is "Part 1"? I would suspect that "Part 2" takes care of that! ;-)


I just looked at it now that it's up. It uses a temp table and a lot of outer apply functions and multiple CTEs. It is a simple enough report to write as just a select. Anything else seems like the wrong tool. Keep it simple and describe what you want in your sql, not how to get it.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search