Sqlserver统计语句

 --查看被缓存的查询计划
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT TOP 20
     st.text AS [SQL]
     , cp.cacheobjtype
     , cp.objtype
     , COALESCE(DB_NAME(st.dbid),
         DB_NAME(CAST(pa.value AS INT))+'*',
         'Resource') AS [DatabaseName]
     , cp.usecounts AS [Plan usage]
     , qp.query_plan
 FROM sys.dm_exec_cached_plans cp
 CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st
 CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle) qp
 OUTER APPLY sys.dm_exec_plan_attributes(cp.plan_handle) pa
 WHERE pa.attribute = 'dbid'
   AND st.text LIKE '%sales%'   

 --查看数据库中跑的最慢的前20个查询以及它们的执行计划
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT TOP 20
   CAST(qs.total_elapsed_time / 1000000.0 AS DECIMAL(28, 2))
                                      AS [Total Duration (s)]
   , CAST(qs.total_worker_time * 100.0 / qs.total_elapsed_time
                                AS DECIMAL(28, 2)) AS [% CPU]
   , CAST((qs.total_elapsed_time - qs.total_worker_time)* 100.0 /
         qs.total_elapsed_time AS DECIMAL(28, 2)) AS [% Waiting]
   , qs.execution_count
   , CAST(qs.total_elapsed_time / 1000000.0 / qs.execution_count
                 AS DECIMAL(28, 2)) AS [Average Duration (s)]
   , SUBSTRING (qt.text,(qs.statement_start_offset/2) + 1,
     ((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) + 1) AS [Individual Query
   , qt.text AS [Parent Query]
   , DB_NAME(qt.dbid) AS DatabaseName
   , qp.query_plan
 FROM sys.dm_exec_query_stats qs
 CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
 CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
 WHERE qs.total_elapsed_time > 0
 ORDER BY qs.total_elapsed_time DESC                

 --被阻塞时间最长的前20个查询以及它们的执行计划
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT TOP 20
   CAST((qs.total_elapsed_time - qs.total_worker_time) /
         1000000.0 AS DECIMAL(28,2)) AS [Total time blocked (s)]
   , CAST(qs.total_worker_time * 100.0 / qs.total_elapsed_time
         AS DECIMAL(28,2)) AS [% CPU]
   , CAST((qs.total_elapsed_time - qs.total_worker_time)* 100.0 /
         qs.total_elapsed_time AS DECIMAL(28, 2)) AS [% Waiting]
   , qs.execution_count
   , CAST((qs.total_elapsed_time  - qs.total_worker_time) / 1000000.0
     / qs.execution_count AS DECIMAL(28, 2)) AS [Blocking average (s)]
   , SUBSTRING (qt.text,(qs.statement_start_offset/2) + 1,
   ((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) + 1) AS [Individual Query]
   , qt.text AS [Parent Query]
   , DB_NAME(qt.dbid) AS DatabaseName
   , qp.query_plan
 FROM sys.dm_exec_query_stats qs
 CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
 CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
 WHERE qs.total_elapsed_time > 0
 ORDER BY [Total time blocked (s)] DESC                       

 --最耗费CPU的前20个查询以及它们的执行计划
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT TOP 20
   CAST((qs.total_worker_time) / 1000000.0 AS DECIMAL(28,2))
                                            AS [Total CPU time (s)]
   , CAST(qs.total_worker_time * 100.0 / qs.total_elapsed_time
                                       AS DECIMAL(28,2)) AS [% CPU]
   , CAST((qs.total_elapsed_time - qs.total_worker_time)* 100.0 /
            qs.total_elapsed_time AS DECIMAL(28, 2)) AS [% Waiting]
              , qs.execution_count
   , CAST((qs.total_worker_time) / 1000000.0
     / qs.execution_count AS DECIMAL(28, 2)) AS [CPU time average (s)]
   , SUBSTRING (qt.text,(qs.statement_start_offset/2) + 1,
     ((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) + 1) AS [Individual Query]
   , qt.text AS [Parent Query]
   , DB_NAME(qt.dbid) AS DatabaseName
   , qp.query_plan
 FROM sys.dm_exec_query_stats qs
 CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
 CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
 WHERE qs.total_elapsed_time > 0
 ORDER BY [Total CPU time (s)] DESC          

  --最占IO的前20个查询以及它们的执行计划
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT TOP 20
   [Total IO] = (qs.total_logical_reads + qs.total_logical_writes)
   , [Average IO] = (qs.total_logical_reads + qs.total_logical_writes) /
                                             qs.execution_count
   , qs.execution_count
   , SUBSTRING (qt.text,(qs.statement_start_offset/2) + 1,
   ((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) + 1) AS [Individual Query]
   , qt.text AS [Parent Query]
   , DB_NAME(qt.dbid) AS DatabaseName
   , qp.query_plan
 FROM sys.dm_exec_query_stats qs
 CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
 CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
 ORDER BY [Total IO] DESC 

 --查找被执行次数最多的查询以及它们的执行计划
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT TOP 20
     qs.execution_count
     , SUBSTRING (qt.text,(qs.statement_start_offset/2) + 1,
     ((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) + 1) AS [Individual Query]
     , qt.text AS [Parent Query]
     , DB_NAME(qt.dbid) AS DatabaseName
     , qp.query_plan
 FROM sys.dm_exec_query_stats qs
 CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
 CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
 ORDER BY qs.execution_count DESC;  

 --特定语句的最后运行时间
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
 SELECT DISTINCT TOP 20
     qs.last_execution_time
     , qt.text AS [Parent Query]
     , DB_NAME(qt.dbid) AS DatabaseName
 FROM sys.dm_exec_query_stats qs
 CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
 WHERE qt.text LIKE '%特定语句的部分%'
 ORDER BY qs.last_execution_time DESC