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
基于…的十大最差查询：
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
