分析SQL语句性能3种方法分享

分析SQL语句性能3种方法分享，需要的朋友可以参考下

Minimsdn.com为您提供的代码: 
-- 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 
第二种方法: 
 代码如下:

MINIMSDN.com为您提供的代码: 
--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 
第三种方法: 

Links: http://msdn.microsoft.com/zh-cn/library/ff650689.aspx ; http://msdn.microsoft.com/zh-cn/library/aa175244(v=SQL.80).aspx 
Demo For three kinds of Method: 
For SQL Script: 
 代码如下:

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: 
 代码如下:

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:
 代码如下:

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:
 代码如下:

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.