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Query Plan Execution Order


Query Plan Execution Order

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Paul White
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Comments posted to this topic are about the item Query Plan Execution Order



Paul White
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Blew that one as did someone before me.

Learned a lot by reading your references - thanks for those.

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read

Before posting a performance problem please read
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Looks like I am the first to get it right! :-D

Makes a change.

I am normally the last person to get it wrong.

Nice question, with lots of interesting articles.
M&M
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This might be the toughest QotD.

M&M
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Going to stick my neck out and say that its wrong.

Yes the stream aggregate gets called first... but it hasnt finished. So is the important part which gets called first or which gets finished first? Personally i think its the part that gets finished first thats important (or more precisly the thing that performs its purpose first). I cant say a function has been executed when it hasnt actually done anything.

Could be a language thing though that i put a different meaning into "executes" then everyone else :-)

/T
Paul White
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tommyh (10/27/2011)
Going to stick my neck out and say that its wrong.

Yes the stream aggregate gets called first... but it hasnt finished. So is the important part which gets called first or which gets finished first? Personally i think its the part that gets finished first thats important (or more precisly the thing that performs its purpose first). I cant say a function has been executed when it hasnt actually done anything.

Could be a language thing though that i put a different meaning into "executes" then everyone else :-)

The learning point today was about execution order (hence the title). Query plans are pipelines, and the intention was to highlight something that most people misunderstand about that. I'm sorry the way I phrased it differs from your intuitive understanding of 'executes', if I could give you your two points, I would. That's not to say that I agree with you (I don't) but points are free, and I like people to be happy :-)



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Gianluca Sartori
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Great question, Paul, and great explanation.
Looks like you tricked most of us (myself included).

--Gianluca Sartori

How to post T-SQL questions
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Paul White
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Gianluca Sartori (10/27/2011)
Great question, Paul, and great explanation.
Looks like you tricked most of us (myself included).

Thanks, but I want to say that I really really really didn't set out to trick anyone with this. It was intended as a follow-on question to my previous one (Table Access Order) but the scheduling meant they came much further apart in time than I intended. The formatting also got messed up in the explanation, but hey ho. Hopefully there's enough value in the learning point that I get away with it.



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Great question. I got it wrong but learned something which is a good start to the day.
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Nice one. I got it right - yay! - though I had to spend 20 minutes reading up (sorry work) first, as I was determined to get it right.

I think the setter was quite correct. If he had said which FINISHES executing first that would be a different matter.
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