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Analysing a T-SQL Query
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Analysing a T-SQL Query
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JayK
JayK
Posted Tuesday, May 04, 2010 10:39 PM
Old Hand
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Comments posted to this topic are about the item
Analysing a T-SQL Query
Post #915796
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Wednesday, May 05, 2010 12:26 AM
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Good "back to basics" question.
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #915841
Kari Suresh
Kari Suresh
Posted Wednesday, May 05, 2010 12:39 AM
SSC Veteran
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Last Login: Tuesday, January 01, 2013 11:12 PM
Points: 248,
Visits: 372
Good Question to analysis..
KSB
-----------------------------
Thousands of candles can be lit from a single candle, and the life of the candle will not be shortened. Knowledge and happiness never decreases by being shared.” - Buddha
Post #915846
SQLRNNR
SQLRNNR
Posted Wednesday, May 05, 2010 12:57 AM
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This is a good question. Thanks. One other method one can use to demonstrate this is by evaluating the actual execution plan.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
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Hidden RBAR - Jeff Moden
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Post #915857
Daniel Bowlin
Daniel Bowlin
Posted Wednesday, May 05, 2010 8:20 AM
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Really interesting question and explanation, thanks.
Post #916108
Trey Staker
Trey Staker
Posted Wednesday, May 05, 2010 8:53 AM
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Great question, made me work for my points.
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Post #916149
Oleg Netchaev
Oleg Netchaev
Posted Wednesday, May 05, 2010 9:04 AM
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CirquedeSQLeil (5/5/2010)
This is a good question. Thanks. One other method one can use to demonstrate this is by evaluating the actual execution plan.
Very good question, thank you. I did not try running the sample yet but I suspect that because the query is pretty simple, highlighting it in SSMS and hitting
CTRL
+
L
(to let SSMS show estimated plan) will do the trick as well because there should not be any differences between actual and estimated plans in this case.
Oleg
Post #916169
JayK
JayK
Posted Wednesday, May 05, 2010 9:17 AM
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Just noticed a typo in the question.
The first line of text should read "non clustered index on EmailAddress" and not "non clustered index on LastName".....this script itself is OK....
Post #916186
SQLRNNR
SQLRNNR
Posted Wednesday, May 05, 2010 9:48 AM
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Last Login: Today @ 3:33 PM
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Oleg Netchaev (5/5/2010)
CirquedeSQLeil (5/5/2010)
This is a good question. Thanks. One other method one can use to demonstrate this is by evaluating the actual execution plan.
Very good question, thank you. I did not try running the sample yet but I suspect that because the query is pretty simple, highlighting it in SSMS and hitting
CTRL
+
L
(to let SSMS show estimated plan) will do the trick as well because there should not be any differences between actual and estimated plans in this case.
Oleg
That is likely true - haven't tried. I am just accustomed to asking for the actual execution plan that it seemed the safer route for this too.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #916213
ColdCoffee
ColdCoffee
Posted Wednesday, May 05, 2010 10:10 AM
SSCrazy
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Last Login: Wednesday, May 01, 2013 4:37 PM
Points: 2,248,
Visits: 5,352
Wonderful question and equally wonderful explanation. The basics is hit in the nail! Thanks for this!
Post #916247
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