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Home » SQL Server 2005 » SQL Server 2005 Performance Tuning » Need high resource expensive sql queries
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sejal p gudhka
Posted Tuesday, September 07, 2010 1:30 AM
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Hi All,

I need sql queries or bad tsql code for producing high expensive resource utilization queries to test some performance reports. I ahve adventure works database in my environment. Please let me know as from where will I get high expensive queries for my testing..

thanks in advance.
Post #981376
LutzM
Posted Tuesday, September 07, 2010 2:48 AM


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Errrmmm... that's a requirement not seen very often...

One option would be to create a c.u.r.s.o.r. on a rather large table (to "avoid" a set based operation).
Inside the c.u.r.s.o.r.:
Join a large number of (large) tables on predicates that are not supported by any index (to force a table scan). Take as many columns as you like and build a large comma delimited string. Insert results into a table variable and use a loop to split the string again by stepping through each character.

Most important: make sure not to run it on a production system!


Lutz
A pessimist is an optimist with experience.

How to get fast answers to your question
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Post #981398
Madhivanan-208264
Posted Tuesday, September 07, 2010 6:45 AM
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Have a million row table and do running total using a triangular join

select col,
(select sum(col) from table as t1 where t1.pkcol<=t2.pkcol) as run_sum
from table as t2


Madhivanan

Failing to plan is Planning to fail
Post #981518
Jeff Moden
Posted Tuesday, September 07, 2010 3:20 PM


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Madhivanan-208264 (9/7/2010)
Have a million row table and do running total using a triangular join

select col,
(select sum(col) from table as t1 where t1.pkcol<=t2.pkcol) as run_sum
from table as t2


Heh... ya beat me to it, Madhivanan.

--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/

For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Post #981942
Derrick Smith
Posted Tuesday, September 07, 2010 3:35 PM


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Also force maxdop to 0 if your server isn't already set to it....a horrible, awful query like that should eat up every available core.
Post #981951
Madhivanan-208264
Posted Wednesday, September 08, 2010 1:23 AM
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Jeff Moden (9/7/2010)
Madhivanan-208264 (9/7/2010)
Have a million row table and do running total using a triangular join

select col,
(select sum(col) from table as t1 where t1.pkcol<=t2.pkcol) as run_sum
from table as t2


Heh... ya beat me to it, Madhivanan.

Yes. Thats the good example that I know which takes lot of time.
The avatar you used is very good
Are you a designer too?


Madhivanan

Failing to plan is Planning to fail
Post #982083
Jeff Moden
Posted Wednesday, September 08, 2010 5:17 AM


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Madhivanan-208264 (9/8/2010)
The avatar you used is very good
Are you a designer too?


No... someone else did most of the work. I just overlaid the word "RBAR" and converted it to a GIF.

--Jeff Moden
"RBAR is pronounced "ree-bar" and is a "Modenism" for "Row-By-Agonizing-Row".

First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."

For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/

For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Post #982194
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