title: Can someone explain DBCC DROPCLEANBUFFERS?
body: <p>Can someone explain the use of <code>DBCC DROPCLEANBUFFERS</code> together with the <code>CHECKPOINT</code> operator and provide an example?</p>
  
  <p>I understand it is useful to test performances running before your queries but I don't fully grasp it. Also I have no clue about the use in combination with the CHECKPOINT operator.</p>
  
  <p>If I execute it before my queries they take much longer to run, so I am guessing it is good to <em>compare</em> performances but not to accurately evaluate them. </p>
  
  <p>Any help would be appreciated!</p>