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Indexed Views


Indexed Views

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sknox
sknox
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Comments posted to this topic are about the item Indexed Views
M&M
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Thanks for the question. I came across another discussion in this link :

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Koen Verbeeck
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Nice question. I vaguely remembered reading something about this in my certification prep, it's not something I encounter daily.


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Carlo Romagnano
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I know that query optimizer use index on view only for some edition, but with noexpand you can force the use of index. I still working with sql2000. In sql2008 r2, I think it would be better to use filtered index.
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
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Thanks for the question.
Got caught out by BOL contradicting itself in various places again.
At least I leaned something here.

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Hugo Kornelis
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I hate questions where I have to second-guess the author. Did the author mean that the optimizer would choose to use the indexed view automatically? Or did he mean that you could make the optimizer use it by using hints? I took a 50% chance gamble, and I chose wrong. Sad

BTW, now that I am posting anyway - there is one word in the explanation is wrong: "The query optimizer in lower editions will only consider the indexed view if you use the NOEXPAND table hint" (emphasis mine) - this is incorrect. With the NOEXPAND hint, the optimizer will not consider the indexed view; this hint forces the optimizer to use the indexed view. Enterprise edition (and developer edition) is the only place where the optimizer will consider the indexed view as one of multiple options, and choose the cheapest.


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Carlo Romagnano
Carlo Romagnano
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Hugo Kornelis (2/10/2012)
I hate questions where I have to second-guess the author. Did the author mean that the optimizer would choose to use the indexed view automatically? Or did he mean that you could make the optimizer use it by using hints? I took a 50% chance gamble, and I chose wrong. Sad

BTW, now that I am posting anyway - there is one word in the explanation is wrong: "The query optimizer in lower editions will only consider the indexed view if you use the NOEXPAND table hint" (emphasis mine) - this is incorrect. With the NOEXPAND hint, the optimizer will not consider the indexed view; this hint forces the optimizer to use the indexed view. Enterprise edition (and developer edition) is the only place where the optimizer will consider the indexed view as one of multiple options, and choose the cheapest.


+1
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
One Orange Chip
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Hugo Kornelis (2/10/2012)
I hate questions where I have to second-guess the author. Did the author mean that the optimizer would choose to use the indexed view automatically? Or did he mean that you could make the optimizer use it by using hints? I took a 50% chance gamble, and I chose wrong. Sad

BTW, now that I am posting anyway - there is one word in the explanation is wrong: "The query optimizer in lower editions will only consider the indexed view if you use the NOEXPAND table hint" (emphasis mine) - this is incorrect. With the NOEXPAND hint, the optimizer will not consider the indexed view; this hint forces the optimizer to use the indexed view. Enterprise edition (and developer edition) is the only place where the optimizer will consider the indexed view as one of multiple options, and choose the cheapest.

+1

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Arthur Olcot
Arthur Olcot
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Hugo Kornelis (2/10/2012)
I hate questions where I have to second-guess the author. Did the author mean that the optimizer would choose to use the indexed view automatically? Or did he mean that you could make the optimizer use it by using hints? I took a 50% chance gamble, and I chose wrong. Sad

BTW, now that I am posting anyway - there is one word in the explanation is wrong: "The query optimizer in lower editions will only consider the indexed view if you use the NOEXPAND table hint" (emphasis mine) - this is incorrect. With the NOEXPAND hint, the optimizer will not consider the indexed view; this hint forces the optimizer to use the indexed view. Enterprise edition (and developer edition) is the only place where the optimizer will consider the indexed view as one of multiple options, and choose the cheapest.


+1
sknox
sknox
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Hugo Kornelis (2/10/2012)
I hate questions where I have to second-guess the author. Did the author mean that the optimizer would choose to use the indexed view automatically? Or did he mean that you could make the optimizer use it by using hints? I took a 50% chance gamble, and I chose wrong. Sad


If I'd meant automatically, I'd have said automatically. :-P

BTW, now that I am posting anyway - there is one word in the explanation is wrong: "The query optimizer in lower editions will only consider the indexed view if you use the NOEXPAND table hint" (emphasis mine) - this is incorrect. With the NOEXPAND hint, the optimizer will not consider the indexed view; this hint forces the optimizer to use the indexed view. Enterprise edition (and developer edition) is the only place where the optimizer will consider the indexed view as one of multiple options, and choose the cheapest.


Yes, that is incorrect, but I think you've picked the wrong word(s) to correct. The intended meaning was "The query optimizer in lower editions will only consider the indexes on the view if you use the NOEXPAND table hint." The reason I used the word consider is that NOEXPAND does not force the use of a particular index, it only tells SQL server not to refer back to the original table.
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