Optimization not enough

Question

Post reply

Optimization not enough

Gangadhara MS

Hall of Fame

Points: 3377
More actions
April 22, 2014 at 12:11 pm

#290569

Hi,
In my execution plan i can see some warning like:
1. "Type conversion in expression (CONVERT_IMPLICIT(varchar(40),[PAIntel].[ActivationDateTime],0)) may affect "CardinalityEstimate" in query plan choice, Type conversion in expression (CONVERT_IMPLICIT(varchar(24),[Machine].[MachineKey],0)) may affect "CardinalityEstimate" in query plan choice "
2. I am not using any order by clause in my query but still its having an sort with warning as
Operator used tempdb to spill data during execution with spill level 2
3. I have a Key look up (clustred) with high cost how do we remove this.
I am doing join with 2 views (there is no indexed view)
and one table is having 84 million records
Any help much appreciated.
Forum Etiquette: How to post Reporting Services problems

[/url]

Forum Etiquette: How to post data/code on a forum to get the best help - by Jeff Moden
[/url]

How to Post Performance Problems - by Gail Shaw
[/url]

Gail Shaw SSC Guru Points: 1004504 More actions · Answer 1

Query, table definitions, index definitions please.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Gangadhara MS Hall of Fame Points: 3377 More actions · Answer 2

1 st tabel is having 48 Lacks recoprds

the 5 th table is having 84 million records

LutzM SSC Guru Points: 107049 More actions · Answer 3

Wow!

The script name have nothing to identify the table in question.

You really like to provide puzzles, do you?

Also, please provide the code of DML.GetRetailOrOnlineIndicator(), which seems to be a function you're calling in your insert script.

Lutz
A pessimist is an optimist with experience.

How to get fast answers to your question[/url]
How to post performance related questions[/url]
Links for Tally Table [/url] , Cross Tabs [/url] and Dynamic Cross Tabs [/url], Delimited Split Function[/url]

Gangadhara MS Hall of Fame Points: 3377 More actions · Answer 4

CREATE FUNCTION [DML].[GetRetailOrOnlineIndicator](

@GrpID INT

,@ChanID INT

,@SeqNo INT

)

RETURNS NVARCHAR(10)

AS

BEGIN

DECLARE @RetailOrOnlineIndicator NVARCHAR(10)

IF EXISTS (SELECT 1

FROM DML.ExtKeyWestRetailOnlineInfo

WHERE GrpID = @GrpID AND SeqNo = CONVERT( BIGINT, CAST(@ChanID AS VARCHAR(3)) + RIGHT('000000'+ CAST(@SeqNo AS VARCHAR(6)),6) ))

SET @RetailOrOnlineIndicator = 'Online'

ELSE

SET @RetailOrOnlineIndicator = 'Retail'

RETURN @RetailOrOnlineIndicator

END

GO

LutzM SSC Guru Points: 107049 More actions · Answer 5

May I ask for the table definition involved?

You provided a view definition. But we'd need the table def. Especially for [ExtOLSMachine].

Lutz
A pessimist is an optimist with experience.

How to get fast answers to your question[/url]
How to post performance related questions[/url]
Links for Tally Table [/url] , Cross Tabs [/url] and Dynamic Cross Tabs [/url], Delimited Split Function[/url]

Gangadhara MS Hall of Fame Points: 3377 More actions · Answer 6

Gangadhara MS

Hall of Fame

Points: 3377

April 22, 2014 at 2:37 pm

#1707910

i dodn't have any table with name as ExtOLSMachine

LutzM SSC Guru Points: 107049 More actions · Answer 7

The View [DML].[ExtOLSMachineEntitlement] refers to a table DML.ExtOLSMachine.

You might want to take the effort to have a look at your execution plan... -> The table is indeed referenced.

I guess I'm out of this challenge...

Lutz
A pessimist is an optimist with experience.

How to get fast answers to your question[/url]
How to post performance related questions[/url]
Links for Tally Table [/url] , Cross Tabs [/url] and Dynamic Cross Tabs [/url], Delimited Split Function[/url]

Gangadhara MS Hall of Fame Points: 3377 More actions · Answer 8

Hi Can you pls help me to study and understand the execution plan properly, i have not done this work earlier but not sure where to look,what to look so posted all query.

mister.magoo SSC-Forever Points: 47068 More actions · Answer 9

First thing I see in the plan is Query 6 which shows up as 99% of the cost.

Within Query 6, there is a section that accounts for 96% of the plan cost

I suspect (from the estimated and actual rowcounts and the predicates present in the Index Seek on ExtPAIntelActivationEvent.NCIX_ISOCountrycode which includes a condition; ISOCountryCode <> N'' which does not appear anywhere in the query text) that you have another view, perhaps within the Scalar function, perhaps this "DML.ExtKeyWestRetailOnlineInfo"

I would inspect that view to see if it is optimised for the purpose of this query.

I would also rewrite the Scalar function GetRetailOrOnlineIndicator as a Table Valued Function (see here : http://www.sqlservercentral.com/articles/T-SQL/91724/[/url] )

Once that is done, test Query 6 from the plan without the INSERT to see if the row estimates are any better and to see if performance has improved.

MM

select geometry::STGeomFromWKB(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