[一步一步]3种方法分析SQL语句性能

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Method 1:

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-- Turn ON [Display IO Info when execute SQL]

SET STATISTICS IO ON

-- Turn OFF [Display IO Info when execute SQL]

SET STATISTICS IO OFF

-- Link: http://msdn.microsoft.com/zh-cn/library/ms184361.aspx
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Method 2:

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--Turn ON [Display detail info and the request for resources]

SET SHOWPLAN_ALL ON 

-- Turn OFF [Display detail info and the request for resources]

SET SHOWPLAN_ALL OFF

-- Link: http://msdn.microsoft.com/zh-cn/library/ms187735

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Method 3:

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   -- Links: http://msdn.microsoft.com/zh-cn/library/ff650689.aspx ; http://msdn.microsoft.com/zh-cn/library/aa175244(v=SQL.80).aspx

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Demo For three kinds of Method:

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For SQL Script:

select * from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC

v  Its Execution plan: ()

 

v  Its IO info: ()

 

-  -  You can try one table with 100/10000/1000000 rows but create/don’t create Clustered/NONCLUSTERED Index.

v  Its Detail info Etc.: ()

For SQL Script:

select top 100 * from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC

v  Its Execution plan: ()

v  Its IO info: ()

 

v  Its Detail info Etc.: ()

For SQL Script:

select top 100 * from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC
order by StagingOMC.COrgTPName

 

v  Its Execution plan: (   )

 

v  Its IO info: ()

v  Its Detail info Etc.: ()

For SQL Script:

select top 100 StagingOMC.COrgTPName,COUNT(CorgID) from dbEBMSStaging.dbo.MSSalesTxlatOrganizationMaster_Corg StagingOMC
group by StagingOMC.COrgTPName
order by StagingOMC.COrgTPName

v  Its Execution plan: ()

 

 

v  Its IO info: ()

 

v  Its Detail info Etc.: ()

 

 

-  -  By these three kinds of methods, you can try to check those words in the internet web are right or wrong about how to improve SQL Script performance.