如何在SQL Server 2008中查找性能最差的查询？

我发现以下示例，但似乎不起作用：

SELECT TOP 5 obj.name,max_logical_reads,max_elapsed_time
FROM sys.dm_exec_query_stats a
CROSS APPLY sys.dm_exec_sql_text(sql_handle) hnd
INNER JOIN sys.sysobjects obj on hnd.objectid = obj.id
ORDER BY max_logical_reads DESC

取自：

http://www.sqlservercurry.com/2010/03/top-5-costly-stored-procedures-in-sql.html

解决方法

SELECT TOP 10
    total_worker_time/execution_count AS Avg_CPU_Time,execution_count,total_elapsed_time/execution_count as AVG_Run_Time,(SELECT
              SUBSTRING(text,statement_start_offset/2,(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 

--pick your criteria

ORDER BY Avg_CPU_Time DESC
--ORDER BY AVG_Run_Time DESC
--ORDER BY execution_count DESC

（编辑：李大同）

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