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Hi Friends,
I have a very simple query-
select COUNT(1) from [dbo].[table1] with (nolock)
When i run the query- sometime it takes 1 second and sometime 30 seconds. Can someone help me why the response time is sometime longer ans sometime good. What may be the possible reason- can please anyone help me?
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It could be for a number of reasons - some of which are discussed on this post - performance - SQL Server statements intermittently slow on SQL Server 2008 R2 - Database Administrators Stack Exchange[^]
It's for SQL 2008 but most, if not all, of the stuff applies to later versions too

If that doesn't help then there around 39k other things to look at[^]

We always used to "freeproccache" - SQL SERVER – Plan Cache – Retrieve and Remove – A Simple Script | Journey to SQL Authority with Pinal Dave[^]
 
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