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SQL Server 2008
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T-SQL (SS2K8)
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TSQL joined Views
TSQL joined Views
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Modest DBA
Modest DBA
Posted Thursday, February 21, 2013 1:55 AM
Grasshopper
Group: General Forum Members
Last Login: Yesterday @ 6:45 AM
Points: 13,
Visits: 237
Hi all
I am having some problems understanding this one.
I have a stored proc (written by the developers), that's using up unnecessary resources.
Basically the stored proc makes use of multiple views. These views contain nested conditional select statements.
Each view contains around 1million odd rows and there are around 8 views.
The problem i am having is that i see pressure on the tempdb log files??? why would this be, i can understand tempdb data files being used for caching but log files??? can someone clear this up for me...thanks all!!!!
...One more thing is there any way to make this faster???
thanks all!!!!
Post #1422438
joeroshan
joeroshan
Posted Thursday, February 21, 2013 2:09 AM
Mr or Mrs. 500
Group: General Forum Members
Last Login: 2 days ago @ 3:45 AM
Points: 572,
Visits: 1,157
Tempdb may be use while grouping sorting etc.
You should look ate the execution plan and see whether any index/ query rewrite can help.
If you need help please share the execution plan, table structure.
-- Roshan Joe
*******************************************
Jeff Moden -Forum Etiquette: How to post data/code on a forum to get the best help
Custom cleanup script for backups
Post #1422444
Modest DBA
Modest DBA
Posted Thursday, February 21, 2013 2:16 AM
Grasshopper
Group: General Forum Members
Last Login: Yesterday @ 6:45 AM
Points: 13,
Visits: 237
Well execution plan seems to be using a "hash match(inner join)", do you know anything about this?
although i don't see any #tables?
Post #1422447
joeroshan
joeroshan
Posted Thursday, February 21, 2013 2:33 AM
Mr or Mrs. 500
Group: General Forum Members
Last Login: 2 days ago @ 3:45 AM
Points: 572,
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Hash match can spill to tempdb.
details on hash join
http://technet.microsoft.com/en-us/library/ms189313(v=sql.105).aspx
-- Roshan Joe
*******************************************
Jeff Moden -Forum Etiquette: How to post data/code on a forum to get the best help
Custom cleanup script for backups
Post #1422455
Modest DBA
Modest DBA
Posted Thursday, February 21, 2013 2:44 AM
Grasshopper
Group: General Forum Members
Last Login: Yesterday @ 6:45 AM
Points: 13,
Visits: 237
This is my problem exactly! thanks bud!!!
Post #1422461
joeroshan
joeroshan
Posted Thursday, February 21, 2013 2:50 AM
Mr or Mrs. 500
Group: General Forum Members
Last Login: 2 days ago @ 3:45 AM
Points: 572,
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Glad to help:)
-- Roshan Joe
*******************************************
Jeff Moden -Forum Etiquette: How to post data/code on a forum to get the best help
Custom cleanup script for backups
Post #1422462
Bhuvnesh
Bhuvnesh
Posted Thursday, February 21, 2013 3:56 AM
SSCrazy
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Last Login: Tuesday, March 26, 2013 8:41 AM
Points: 2,562,
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Modest DBA (2/21/2013)
One more thing is there any way to make this faster?
Yes and the first step would be tune your stored proc
1 try to restrict the query to required columns
2 apply proper filter which should/must use indexes.
3 if intermediate steps are playing with large volume data , try to store them in temp table have indexes on them and use them in later part.
-------Bhuvnesh----------
While 1 = 1 (Learning SQL....)
Click to get fast response of your post
Post #1422488
ScottPletcher
ScottPletcher
Posted Friday, February 22, 2013 1:48 PM
Ten Centuries
Group: General Forum Members
Last Login: Yesterday @ 2:38 PM
Points: 1,318,
Visits: 1,763
Usually views contain lots of columns that aren't really needed when several of them are joined to produce a new result set.
Stop using the views and code directly against the underlying tables when possible, unless the views are just "dummy" views of "SELECT * FROM tablename" to remove dependencies on the actual table name.
SQL DBA,SQL Server MVP('07, '08, '09)
One man with courage makes a majority. Andrew Jackson
Post #1423250
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