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Improving performance on joins to large...
Improving performance on joins to large tables.
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cadebryant
cadebryant
Posted Monday, September 24, 2007 1:36 AM
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Group: General Forum Members
Last Login: Wednesday, November 05, 2008 2:49 PM
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Comments posted to this topic are about the item
Improving performance on joins to large tables.
Post #401874
prasad_wickramasinghe
prasad_wickramasinghe
Posted Monday, June 30, 2008 11:47 PM
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Last Login: Tuesday, July 01, 2008 12:22 AM
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Here u can improve performance more by specifying column names rather than using "*". Because using * queries sys.columns system table for get the column names, which is unnecessary when we can simply specify them.
But you have to remember to update SP when u change the table(columns).
regards,
http://onlinecoder.blogspot.com/
Post #526327
GilaMonster
GilaMonster
Posted Tuesday, July 01, 2008 12:10 AM
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Last Login: Today @ 3:28 PM
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SQL has to do meta-data lookups whether or not * is specified as it has to find the types and the column lengths.
The reasons to not use select * are more around only retrieving the columns that you need and not returning all of them out of laziness. It's also so that code won't break if a new clumn is added to a table. finally, select * makes creating covering indexes almost impossible.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
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
Post #526329
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