如何在 SQL Server 2008 中找到性能最差的查询?

问题描述

如何找出 SQL Server 2008 中性能最差的查询?

How to find the worst performing queries in SQL Server 2008?

我找到了以下示例，但它似乎不起作用:

I found the following example but it does not seem to work:

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

推荐答案

基于...的 10 个最差查询:

top 10 worst queries based on...:

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

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