查看SQL 语句执行性能

SELECT TOP 100 
 [Average CPU used] = total_worker_time / qs.execution_count/1000000
,[Total CPU used] = total_worker_time/1000000
,[Execution count] = qs.execution_count
,[Individual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2, 
         (CASE WHEN qs.statement_end_offset = -1 
            THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 
          ELSE qs.statement_end_offset END - 
qs.statement_start_offset)/2)
,[Parent Query] = qt.text
,DatabaseName = DB_NAME(qt.dbid)
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
--where  qs.execution_count>100
ORDER BY [Average CPU used] DESC;