SQL Server 查询性能异常语句

SELECT TOP 10
       st.text AS SQL_Full,
       SUBSTRING(   st.text,
                    (qs.statement_start_offset / 2) + 1,
                    ((CASE statement_end_offset
                          WHEN -1 THEN
                              DATALENGTH(st.text)
                          ELSE
                              qs.statement_end_offset
                      END - qs.statement_start_offset
                     ) / 2
                    ) + 1
                ) AS SQL_Part, --统计对应的部分语句
       CAST(((qs.total_elapsed_time / 1000000.0) / qs.execution_count) AS DECIMAL(28, 2)) AS [平均消耗秒数],
       CAST(qs.last_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [最后完成消耗秒数],
       qs.last_execution_time AS [最后执行时间],
       CAST(qs.min_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [最小消耗秒数],
       CAST(qs.max_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [最大消耗秒数],
       CAST(qs.total_elapsed_time / 1000000.0 AS DECIMAL(28, 2)) AS [总消耗秒数],
       (qs.execution_count) AS [总执行次数],
       creation_time AS [编译计划的时间],
       CAST(qs.last_worker_time / 1000000.0 AS DECIMAL(28, 2)) AS [最后完成占用CPU秒数],
       qp.query_plan
FROM sys.dm_exec_query_stats qs
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st
    CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
WHERE qs.last_execution_time > DATEADD(n, -30, GETDATE())
ORDER BY qs.last_worker_time DESC;