SQL code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | SELECT s2.dbid , DB_NAME(s2.dbid) AS [数据库名] , --s1.sql_handle , ( SELECT TOP 1 SUBSTRING(s2.text, statement_start_offset / 2 + 1, ( ( CASE WHEN statement_end_offset = -1 THEN ( LEN(CONVERT(NVARCHAR(MAX), s2.text)) * 2 ) ELSE statement_end_offset END ) - statement_start_offset ) / 2 + 1) ) AS [语句] , execution_count AS [执行次数] , last_execution_time AS [上次开始执行计划的时间] , total_worker_time AS [自编译以来执行所用的 CPU 时间总量（微秒）] , last_worker_time AS [上次执行计划所用的 CPU 时间（微秒）] , min_worker_time AS [单次执行期间曾占用的最小 CPU 时间（微秒）] , max_worker_time AS [单次执行期间曾占用的最大 CPU 时间（微秒）] , total_logical_reads AS [总逻辑读] , last_logical_reads AS [上次逻辑读] , min_logical_reads AS [最少逻辑读] , max_logical_reads AS [最大逻辑读] , total_logical_writes AS [总逻辑写] , last_logical_writes AS [上次逻辑写] , min_logical_writes AS [最小逻辑写] , max_logical_writes AS [最大逻辑写] FROM sys.dm_exec_query_stats AS s1 CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2 WHERE s2.objectid IS NULL ORDER BY last_worker_time DESC |
2、展示耗时查询：
SQL code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | -- List expensive queries DECLARE @MinExecutions int; SET @MinExecutions = 5 SELECT EQS.total_worker_time AS TotalWorkerTime ,EQS.total_logical_reads + EQS.total_logical_writes AS TotalLogicalIO ,EQS.execution_count As ExeCnt ,EQS.last_execution_time AS LastUsage ,EQS.total_worker_time / EQS.execution_count as AvgCPUTimeMiS ,(EQS.total_logical_reads + EQS.total_logical_writes) / EQS.execution_count AS AvgLogicalIO ,DB.name AS DatabaseName ,SUBSTRING(EST.text ,1 + EQS.statement_start_offset / 2 ,(CASE WHEN EQS.statement_end_offset = -1 THEN LEN(convert(nvarchar(max), EST.text)) * 2 ELSE EQS.statement_end_offset END - EQS.statement_start_offset) / 2 ) AS SqlStatement -- Optional with Query plan; remove comment to show, but then the query takes !!much longer time!! --,EQP.[query_plan] AS [QueryPlan] FROM sys.dm_exec_query_stats AS EQS CROSS APPLY sys.dm_exec_sql_text(EQS.sql_handle) AS EST CROSS APPLY sys.dm_exec_query_plan(EQS.plan_handle) AS EQP LEFT JOIN sys.databases AS DB ON EST.dbid = DB.database_id WHERE EQS.execution_count > @MinExecutions AND EQS.last_execution_time > DATEDIFF(MONTH, -1, GETDATE()) ORDER BY AvgLogicalIo DESC ,AvgCPUTimeMiS DESC |
3、当前进程及其语句：
SQL code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | -- Current processes and their SQL statements SELECT PRO.loginame AS LoginName ,DB.name AS DatabaseName ,PRO.[status] as ProcessStatus ,PRO.cmd AS Command ,PRO.last_batch AS LastBatch ,PRO.cpu AS Cpu ,PRO.physical_io AS PhysicalIo ,SES.row_count AS [RowCount] ,STM.[text] AS SQLStatement FROM sys.sysprocesses AS PRO INNER JOIN sys.databases AS DB ON PRO.dbid = DB.database_id INNER JOIN sys.dm_exec_sessions AS SES ON PRO.spid = SES.session_id CROSS APPLY sys.dm_exec_sql_text(PRO.sql_handle) AS STM WHERE PRO.spid >= 50 -- Exclude system processes ORDER BY PRO.physical_io DESC ,PRO.cpu DESC; |
4、存储过程执行情况：
SQL code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | -- Stored Procedure Execution Statistics SELECT ISNULL(DBS.name, '') AS DatabaseName ,OBJECT_NAME(EPS.object_id, EPS.database_id) AS ObjectName ,EPS.cached_time AS CachedTime ,EPS.last_elapsed_time AS LastElapsedTime ,EPS.execution_count AS ExecutionCount ,EPS.total_worker_time / EPS.execution_count AS AvgWorkerTime ,EPS.total_elapsed_time / EPS.execution_count AS AvgElapsedTime ,(EPS.total_logical_reads + EPS.total_logical_writes) / EPS.execution_count AS AvgLogicalIO FROM sys.dm_exec_procedure_stats AS EPS LEFT JOIN sys.databases AS DBS ON EPS.database_id = DBS.database_id ORDER BY AvgWorkerTime DESC; |
5、开销较大的查询：
SQL code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /* 开销较大的查询 */ SELECT ss.SUM_execution_count , t.text , ss.SUM_total_elapsed_time , ss.sum_total_worker_time , ss.sum_total_logical_reads , ss.sum_total_logical_writes FROM ( SELECT S.plan_handle , SUM(s.execution_count) SUM_Execution_count , SUM(s.total_elapsed_time) SUM_total_elapsed_time , SUM(s.total_worker_time) SUM_total_worker_time , SUM(s.total_logical_reads) SUM_total_logical_reads , SUM(s.total_logical_writes) SUM_total_logical_writes FROM sys.dm_exec_query_stats s GROUP BY S.plan_handle ) AS ss CROSS APPLY sys.dm_exec_sql_text(ss.plan_handle) t ORDER BY sum_total_logical_reads DESC |
SQL code?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | select er.session_id, cast(csql.text AS varchar(255)) AS CallingSQL from master.sys.dm_exec_requests er WITH (NOLOCK) CROSS APPLY fn_get_sql (er.sql_handle) csql where er.session_id =309 |