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  CHECKPOINT --ÓÃÓÚ¼ì²éµ±Ç°¹¤×÷µÄÊý¾Ý¿âÖб»¸ü¸Ä¹ýµÄÊý¾ÝÒ³»òÈÕÖ¾Ò³£¬²¢½«ÕâЩÊý¾Ý´ÓÊý¾Ý»º³åÆ÷ÖÐÇ¿ÖÆÐ´ÈëÓ²ÅÌ
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  DBCC DropCleanBuffers --´Ó¹ý³Ì¸ßËÙ»º´æÖÐɾ³ýËùÓÐÔªËØ
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  GO
  SET Statistics IO ON
  SET Statistics TIME ON
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 ---------------------------
 DECLARE @b datetime
 DECLARE @e datetime
 set @b = getdate();
 select COUNT(*) from test1;
 set @e = getdate();
 select DATEDIFF(ms,@b,@e)
 ----------------------------
 SET Statistics IO OFF
 SET Statistics TIME OFF
 GO
 DBCC DropCleanBuffers
 DBCC FreeProcCache
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