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How does the IN ( ) clause affect performance?

Posted By:      Posted Date: August 28, 2010    Points: 0   Category :Sql Server
When you have a query like this... Select * from Table1 WHERE a=1 and b=2 and c IN (5,6,7,8,9,0,1,2,3,4) How does SQL process that? I am trying to figure out if there is any real performance difference between the IN ( ) clause and a join to a temp table. Thanks! Jim

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Order By clause in RowNumber function slowing down the performance of my query.



I have a query which has a paging functionality and for which i'm using ROW_NUMBER() function. The order by clause in my rownumber function is dynamic and gets changed all the time when ever the sp is called. It works fine for few columns but for one column which is of datetime datatype, it takes lot of time. Amazing thing is with when i sort by the same column in descending order, the query runs in a sec but ascending order takes lot of time :(.

I tried creating a non clustered index(as i already i have a clustered index on that table) on that datetime column but it did not help me.

Could you please suggest what i can do to improve the performance.






will create / drop a lot of indexes affect sql performance?

if so, how badly it affects the performance? disk, memory or cpu?

Use of > or >= in Where clause performance wise


This question is sequel to my previous question in this forum: http://social.msdn.microsoft.com/Forums/en-US/transactsql/thread/a4a9edd5-4896-497d-91a9-520979a1f36b/

Both of the WHERE clause will fetch equal number of records, but which one is best to use performance wise or just as a best practice?

where x > 9


where x >= 10

Edit: SQL Server Ver 2005 (on request of Kalen Delaney)


How much can affect the performance heavily loaded sql-server intensive use of such tools as SQL Ser


How much can affect the performance heavily loaded sql-server intensive use of such tools as SQL Server Profiler ?

5%   ?

15% ?

30% ?

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