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Indexed Views
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sknox
sknox
Posted Thursday, February 09, 2012 8:01 PM
Ten Centuries
Group: General Forum Members
Last Login: Tuesday, May 21, 2013 9:31 AM
Points: 1,041,
Visits: 1,356
Comments posted to this topic are about the item
Indexed Views
Post #1250049
mohammed moinudheen
mohammed moinudheen
Posted Thursday, February 09, 2012 11:47 PM
SSCrazy
Group: General Forum Members
Last Login: Yesterday @ 7:43 PM
Points: 2,174,
Visits: 3,586
Thanks for the question. I came across another discussion in this
link
:
Mohammed Moinudheen
Post #1250077
Koen Verbeeck
Koen Verbeeck
Posted Friday, February 10, 2012 12:17 AM
SSCrazy Eights
Group: General Forum Members
Last Login: Yesterday @ 2:11 AM
Points: 9,378,
Visits: 6,473
Nice question. I vaguely remembered reading something about this in my certification prep, it's not something I encounter daily.
How to post forum questions.
Need an answer? No, you need a question.
What’s the deal with Excel & SSIS?
Member of
LinkedIn
. My blog at
LessThanDot
.
MCSA SQL Server 2012 - MCSE Business Intelligence
Post #1250079
Carlo Romagnano
Carlo Romagnano
Posted Friday, February 10, 2012 1:25 AM
SSCommitted
Group: General Forum Members
Last Login: Yesterday @ 12:56 AM
Points: 1,972,
Visits: 1,822
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.
Post #1250087
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Friday, February 10, 2012 1:49 AM
Hall of Fame
Group: General Forum Members
Last Login: 2 days ago @ 8:31 AM
Points: 3,129,
Visits: 4,312
Thanks for the question.
Got caught out by BOL contradicting itself in various places again.
At least I leaned something here.
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #1250096
Hugo Kornelis
Hugo Kornelis
Posted Friday, February 10, 2012 2:32 AM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 3:21 AM
Points: 5,244,
Visits: 7,062
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.
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.
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #1250113
Carlo Romagnano
Carlo Romagnano
Posted Friday, February 10, 2012 2:47 AM
SSCommitted
Group: General Forum Members
Last Login: Yesterday @ 12:56 AM
Points: 1,972,
Visits: 1,822
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.
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
Post #1250123
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Friday, February 10, 2012 2:51 AM
Hall of Fame
Group: General Forum Members
Last Login: 2 days ago @ 8:31 AM
Points: 3,129,
Visits: 4,312
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.
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
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #1250125
arthurolcot
arthurolcot
Posted Friday, February 10, 2012 5:14 AM
SSCommitted
Group: General Forum Members
Last Login: Monday, May 20, 2013 9:04 AM
Points: 1,722,
Visits: 1,404
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.
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
Post #1250201
sknox
sknox
Posted Friday, February 10, 2012 5:46 AM
Ten Centuries
Group: General Forum Members
Last Login: Tuesday, May 21, 2013 9:31 AM
Points: 1,041,
Visits: 1,356
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.
If I'd meant automatically, I'd have said automatically.
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.
Post #1250219
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