SQL Server 2005 排查I/O瓶颈

  
    

   
     --
   
      top 10 引发i/o
   
     

   
     SELECT
   
      (total_logical_reads
   
     /
   
     execution_count) 
   
     AS
   
      avg_logical_reads
,(total_logical_writes
   
     /
   
     execution_count) 
   
     AS
   
      avg_logical_writes
,(total_physical_reads
   
     /
   
     execution_count) 
   
     AS
   
      avg_physical_reads
,execution_count
,(
   
     SELECT
   
      
   
     SUBSTRING
   
     (
   
     text
   
     ,statement_start_offset
   
     /
   
     2
   
      
   
     +
   
     1
   
     ,
 (
   
     CASE
   
      
   
     WHEN
   
      statement_end_offset 
   
     =
   
      
   
     -
   
     1
   
     
 
   
     THEN
   
      
   
     LEN
   
     (
   
     CONVERT
   
     (
   
     NVARCHAR
   
     (
   
     max
   
     ),
   
     text
   
     )) 
   
     *
   
     2
   
     
 
   
     ELSE
   
      statement_end_offset
 
   
     END
   
      
   
     -
   
      statement_start_offset)
   
     /
   
     2
   
     )
 
   
     FROM
   
      sys.dm_exec_sql_text(sql_handle)) 
   
     AS
   
      query_text

   
     FROM
   
      sys.dm_exec_query_stats

   
     ORDER
   
      
   
     BY
   
      (total_logical_reads 
   
     +
   
      total_logical_writes)