Can we Prioritize which index to be used first in a Select query ?

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Can we Prioritize which index to be used first in a Select query ?

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balajisrm

Posted Saturday, September 15, 2012 9:31 AM

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Can we Prioritize which index to be used first in a Select query? if so how can this be done.

Post #1359815

bitbucket-25253

Posted Saturday, September 15, 2012 9:59 AM

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Do not know if this will do exactly what you want to do, but read here:
http://msdn.microsoft.com/en-us/library/ms181714(v=sql.100).aspx

If everything seems to be going well, you have obviously overlooked something.

Ron

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Before posting a performance problem please read

Post #1359820

GilaMonster

Posted Saturday, September 15, 2012 10:30 AM

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The optimiser chooses the best index for a query based on its knowledge of the data distribution, rows involved and a few other factors.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #1359824

MysteryJimbo

Posted Sunday, September 16, 2012 2:22 AM

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You can but I would only advise this in exceptional circumstances like you are not in a position to updates stats on a very, very large table or in a high tps environment. In a sense "dont try this at home" unless under supervision of an adult or an experienced dba.

Adding WITH(INDEX=idx_i_am_an_index) just after the table name or alias.

Another alternative is adding OPTION(FORCE ORDER) enforces the join order of the query given.

Post #1359870

balajisrm

Posted Sunday, September 16, 2012 5:23 AM

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Thanks for your help!

Post #1359880

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