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Hidden RBAR: Triangular Joins


Hidden RBAR: Triangular Joins

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sing4you
sing4you
Mr or Mrs. 500
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That was an excellent article. I look forward to seeing the workaround!

Thanks.
Jeff Moden
Jeff Moden
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Hi Jeff,

thanks for this article.

A solution to this problem is to use procedural code (at least for SQL2K).
Probably not the intention of the author... BigGrin


Thanks for the feedback and the code, Christian. Heh, yeah, as you can see, the WHILE loop is much, much faster in this case... using triangular joins would cause a run that you'd probably cancel after 20 minutes...

I'll be sure to include some "timings" in the upcoming article(s).

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
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Jeff Moden
Jeff Moden
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"Interesting, but where's the hint as to how to avoid/mitigate the problem?"...
In case you're interested, a simplified explanation of problem is invoices that get queries raised.

Yeaup.... that's where I first ran into similar problems... millions of invoices...

I look forward to seeing your later articles.

Thanks, Derek... sorry for the "teaser".

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
Jeff Moden
Jeff Moden
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Heh... that makes a pretty cool sounding acronymn, too... "SbS" BigGrin

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
Jeff Moden
Jeff Moden
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Jason Selburg (12/6/2007)
Jeff Moden (12/5/2007)
....... I finally got 2k5 and will have to load it before comparing the methods to the RANK methods for running counts performance wise.


Well it's about time ! w00t


Heh... that what it's always been about... "time"... Tongue

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
Jeff Moden
Jeff Moden
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Group: General Forum Members
Points: 45056 Visits: 39902
sing4you (12/6/2007)
That was an excellent article. I look forward to seeing the workaround!
Thanks.


Thank you for the both the feedback, and the encouragement!

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
TheSQLGuru
TheSQLGuru
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Nicely done Jeff! The graphics will really help even neophyte SET-BASED devs to understand what is really going on.

Best,

Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru at GMail
peterzeke
peterzeke
Old Hand
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Jeff:

Great article. I'm looking forward to your next article that includes the solutions to avoiding triangular joins and RBAR!

--Pete



Matt Miller (#4)
Matt Miller (#4)
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Nice one Jeff - I can see it's been a little while in the making (given all of the handy graphics...)

You might care to edit your first post in this thread (where the link to the article is supposed to appear). Looks like the link got "et" (southern for "eaten").

Link is Hidden RBAR: Triangular Joins

Not paying attention to the cardinality of a query is definitely an issue. Even the best of set processors will eventually choke on sets with polynomial growth factors.

And - welcome to the SQL2005 family (at last). I'm curious to see if your view of it changes at all.....

----------------------------------------------------------------------------------
Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?
Jason Selburg
Jason Selburg
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Matt Miller (12/6/2007)
.....And - welcome to the SQL2005 family (at last). I'm curious to see if your view of it changes at all.....



Yes Jeff, come to the dark side! Alien

______________________________________________________________________

Personal Motto: Why push the envelope when you can just open it?

If you follow the direction given HERE you'll likely increase the number and quality of responses you get to your question.

Jason L. Selburg
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