How do u clear Cache in SQL

if i run a query once it takes 10 seconds and if i run the same query again it takes 1 second because it is cached. So i want to know how i can clear it because i want do some benchmarking on a query that is in cache

DBCC DROPCLEANBUFFERS

and

DBCC FREEPROCCACHE

finally a straight forward question.

Why is the sky blue?

it has something to with the sun bouncing off the stuff in the air i think. yes here it is...

http://www.sciencemadesimple.com/sky_blue.html

that's one I know!

sunlight is scattered by the atmosphere predominantly by Rayleigh scattering, which is light scattering by electric dipoles. it's much stronger at higher frequencies (that is, the higher the frequency, the more light is scattered). It's actually quite a strong dependence, goes like freq^4.

Since all the molecules in the atmosphere scatter the blue end of the spectrum much more strongly than the red, the sky is blue. It's bluest at 90 degrees between you and the sun because dipole scattering is strongest there.

Clearing the query cache in sql server is pretty simple. It helps you at the time of checking the query performance in sql server. I think the following article will help you to clear query cache in SQL Server.

How to Clear Query Cache in SQL Server