我相信在座各位的回答。

这个脚本展示了如何找到影响SQL的最慢的20个查询

select top 20 dest.text, deqs.execution_count, deqs.total_elapsed_time, deqs.total_worker_time,
(deqs.total_elapsed_time / deqs.execution_count) as 'avg_elapse_time',
(deqs.total_worker_time / deqs.execution_count) as 'avg_worker_time'
from sys.dm_exec_query_stats as deqs
CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) as dest
where deqs. last_execution_time >= '2021-09-27 16:00' /* YOUR DATE AND TIME HERE*/
order by 'avg_elapse_time' desc

If the queries you are interested in are dynamic queries that fail intermittently, you could log the SQL and the datetime and user in a table at the time the dynamic statement is created. It would be done on a case-by case basis though as it requires specific programming to happen and it takes a littel extra processing time, so do it only for those few queries you are most concerned about. But having a log of the specific statements executed can really help when you are trying to find out why it fails once a month only. Dynamic queries are hard to thoroughly test and sometimes you get one specific input value that just won't work and doing this logging at the time the SQL is created is often the best way to see what specifically wasn in the sql that was built.

如果需要，可以通过SQL Profiler监视SQL查询

查询历史可以通过系统视图查看:

sys.dm_exec_query_stats sys.dm_exec_sql_text sys.dm_exec_query_plan

例如，使用以下查询:

select  top(100)
        creation_time,
        last_execution_time,
        execution_count,
        total_worker_time/1000 as CPU,
        convert(money, (total_worker_time))/(execution_count*1000)as [AvgCPUTime],
        qs.total_elapsed_time/1000 as TotDuration,
        convert(money, (qs.total_elapsed_time))/(execution_count*1000)as [AvgDur],
        total_logical_reads as [Reads],
        total_logical_writes as [Writes],
        total_logical_reads+total_logical_writes as [AggIO],
        convert(money, (total_logical_reads+total_logical_writes)/(execution_count + 0.0)) as [AvgIO],
        [sql_handle],
        plan_handle,
        statement_start_offset,
        statement_end_offset,
        plan_generation_num,
        total_physical_reads,
        convert(money, total_physical_reads/(execution_count + 0.0)) as [AvgIOPhysicalReads],
        convert(money, total_logical_reads/(execution_count + 0.0)) as [AvgIOLogicalReads],
        convert(money, total_logical_writes/(execution_count + 0.0)) as [AvgIOLogicalWrites],
        query_hash,
        query_plan_hash,
        total_rows,
        convert(money, total_rows/(execution_count + 0.0)) as [AvgRows],
        total_dop,
        convert(money, total_dop/(execution_count + 0.0)) as [AvgDop],
        total_grant_kb,
        convert(money, total_grant_kb/(execution_count + 0.0)) as [AvgGrantKb],
        total_used_grant_kb,
        convert(money, total_used_grant_kb/(execution_count + 0.0)) as [AvgUsedGrantKb],
        total_ideal_grant_kb,
        convert(money, total_ideal_grant_kb/(execution_count + 0.0)) as [AvgIdealGrantKb],
        total_reserved_threads,
        convert(money, total_reserved_threads/(execution_count + 0.0)) as [AvgReservedThreads],
        total_used_threads,
        convert(money, total_used_threads/(execution_count + 0.0)) as [AvgUsedThreads],
        case 
            when sql_handle IS NULL then ' '
            else(substring(st.text,(qs.statement_start_offset+2)/2,(
                case
                    when qs.statement_end_offset =-1 then len(convert(nvarchar(MAX),st.text))*2      
                    else qs.statement_end_offset    
                end - qs.statement_start_offset)/2  ))
        end as query_text,
        db_name(st.dbid) as database_name,
        object_schema_name(st.objectid, st.dbid)+'.'+object_name(st.objectid, st.dbid) as [object_name],
        sp.[query_plan]
from sys.dm_exec_query_stats as qs with(readuncommitted)
cross apply sys.dm_exec_sql_text(qs.[sql_handle]) as st
cross apply sys.dm_exec_query_plan(qs.[plan_handle]) as sp
WHERE st.[text] LIKE '%query%'

使用下面的脚本可以看到当前运行的查询:

select ES.[session_id]
      ,ER.[blocking_session_id]
      ,ER.[request_id]
      ,ER.[start_time]
      ,DateDiff(second, ER.[start_time], GetDate()) as [date_diffSec]
      , COALESCE(
                    CAST(NULLIF(ER.[total_elapsed_time] / 1000, 0) as BIGINT)
                   ,CASE WHEN (ES.[status] <> 'running' and isnull(ER.[status], '')  <> 'running') 
                            THEN  DATEDIFF(ss,0,getdate() - nullif(ES.[last_request_end_time], '1900-01-01T00:00:00.000'))
                    END
                ) as [total_time, sec]
      , CAST(NULLIF((CAST(ER.[total_elapsed_time] as BIGINT) - CAST(ER.[wait_time] AS BIGINT)) / 1000, 0 ) as bigint) as [work_time, sec]
      , CASE WHEN (ER.[status] <> 'running' AND ISNULL(ER.[status],'') <> 'running') 
                THEN  DATEDIFF(ss,0,getdate() - nullif(ES.[last_request_end_time], '1900-01-01T00:00:00.000'))
        END as [sleep_time, sec] --Время сна в сек
      , NULLIF( CAST((ER.[logical_reads] + ER.[writes]) * 8 / 1024 as numeric(38,2)), 0) as [IO, MB]
      , CASE  ER.transaction_isolation_level
        WHEN 0 THEN 'Unspecified'
        WHEN 1 THEN 'ReadUncommited'
        WHEN 2 THEN 'ReadCommited'
        WHEN 3 THEN 'Repetable'
        WHEN 4 THEN 'Serializable'
        WHEN 5 THEN 'Snapshot'
        END as [transaction_isolation_level_desc]
      ,ER.[status]
      ,ES.[status] as [status_session]
      ,ER.[command]
      ,ER.[percent_complete]
      ,DB_Name(coalesce(ER.[database_id], ES.[database_id])) as [DBName]
      , SUBSTRING(
                    (select top(1) [text] from sys.dm_exec_sql_text(ER.[sql_handle]))
                  , ER.[statement_start_offset]/2+1
                  , (
                        CASE WHEN ((ER.[statement_start_offset]<0) OR (ER.[statement_end_offset]<0))
                                THEN DATALENGTH ((select top(1) [text] from sys.dm_exec_sql_text(ER.[sql_handle])))
                             ELSE ER.[statement_end_offset]
                        END
                        - ER.[statement_start_offset]
                    )/2 +1
                 ) as [CURRENT_REQUEST]
      ,(select top(1) [text] from sys.dm_exec_sql_text(ER.[sql_handle])) as [TSQL]
      ,(select top(1) [objectid] from sys.dm_exec_sql_text(ER.[sql_handle])) as [objectid]
      ,(select top(1) [query_plan] from sys.dm_exec_query_plan(ER.[plan_handle])) as [QueryPlan]
      ,NULL as [event_info]--(select top(1) [event_info] from sys.dm_exec_input_buffer(ES.[session_id], ER.[request_id])) as [event_info]
      ,ER.[wait_type]
      ,ES.[login_time]
      ,ES.[host_name]
      ,ES.[program_name]
      ,cast(ER.[wait_time]/1000 as decimal(18,3)) as [wait_timeSec]
      ,ER.[wait_time]
      ,ER.[last_wait_type]
      ,ER.[wait_resource]
      ,ER.[open_transaction_count]
      ,ER.[open_resultset_count]
      ,ER.[transaction_id]
      ,ER.[context_info]
      ,ER.[estimated_completion_time]
      ,ER.[cpu_time]
      ,ER.[total_elapsed_time]
      ,ER.[scheduler_id]
      ,ER.[task_address]
      ,ER.[reads]
      ,ER.[writes]
      ,ER.[logical_reads]
      ,ER.[text_size]
      ,ER.[language]
      ,ER.[date_format]
      ,ER.[date_first]
      ,ER.[quoted_identifier]
      ,ER.[arithabort]
      ,ER.[ansi_null_dflt_on]
      ,ER.[ansi_defaults]
      ,ER.[ansi_warnings]
      ,ER.[ansi_padding]
      ,ER.[ansi_nulls]
      ,ER.[concat_null_yields_null]
      ,ER.[transaction_isolation_level]
      ,ER.[lock_timeout]
      ,ER.[deadlock_priority]
      ,ER.[row_count]
      ,ER.[prev_error]
      ,ER.[nest_level]
      ,ER.[granted_query_memory]
      ,ER.[executing_managed_code]
      ,ER.[group_id]
      ,ER.[query_hash]
      ,ER.[query_plan_hash]
      ,EC.[most_recent_session_id]
      ,EC.[connect_time]
      ,EC.[net_transport]
      ,EC.[protocol_type]
      ,EC.[protocol_version]
      ,EC.[endpoint_id]
      ,EC.[encrypt_option]
      ,EC.[auth_scheme]
      ,EC.[node_affinity]
      ,EC.[num_reads]
      ,EC.[num_writes]
      ,EC.[last_read]
      ,EC.[last_write]
      ,EC.[net_packet_size]
      ,EC.[client_net_address]
      ,EC.[client_tcp_port]
      ,EC.[local_net_address]
      ,EC.[local_tcp_port]
      ,EC.[parent_connection_id]
      ,EC.[most_recent_sql_handle]
      ,ES.[host_process_id]
      ,ES.[client_version]
      ,ES.[client_interface_name]
      ,ES.[security_id]
      ,ES.[login_name]
      ,ES.[nt_domain]
      ,ES.[nt_user_name]
      ,ES.[memory_usage]
      ,ES.[total_scheduled_time]
      ,ES.[last_request_start_time]
      ,ES.[last_request_end_time]
      ,ES.[is_user_process]
      ,ES.[original_security_id]
      ,ES.[original_login_name]
      ,ES.[last_successful_logon]
      ,ES.[last_unsuccessful_logon]
      ,ES.[unsuccessful_logons]
      ,ES.[authenticating_database_id]
      ,ER.[sql_handle]
      ,ER.[statement_start_offset]
      ,ER.[statement_end_offset]
      ,ER.[plan_handle]
      ,NULL as [dop]--ER.[dop]
      ,coalesce(ER.[database_id], ES.[database_id]) as [database_id]
      ,ER.[user_id]
      ,ER.[connection_id]
from sys.dm_exec_requests ER with(readuncommitted)
right join sys.dm_exec_sessions ES with(readuncommitted)
on ES.session_id = ER.session_id 
left join sys.dm_exec_connections EC  with(readuncommitted)
on EC.session_id = ES.session_id
where ER.[status] in ('suspended', 'running', 'runnable')
or exists (select top(1) 1 from sys.dm_exec_requests as ER0 where ER0.[blocking_session_id]=ES.[session_id])

该请求显示所有活动请求和显式阻止活动请求的所有请求。

所有这些和其他有用的脚本都作为SRV数据库中的表示形式实现，该数据库是免费分发的。 例如，第一个脚本来自视图[inf]。[vBigQuery]，第二个来自视图[inf].[vRequests]。

对于查询历史，也有各种第三方解决方案。 我使用Dbeaver的查询管理器: 和SSMS内嵌的SQL Tools中的查询执行历史:

下面的SQL查询可以显示简单的查询日志:

SELECT last_execution_time, text
FROM sys.dm_exec_query_stats stats
CROSS APPLY sys.dm_exec_sql_text(stats.sql_handle) 
ORDER BY last_execution_time

下图是它的样子:

并且，下面的SQL查询可以显示简单的事务查询日志:

SELECT Operation, [Begin Time], [End Time] 
FROM fn_dblog(NULL,NULL)

下图是它的样子:

此外，我还不知道SQL查询将简单查询日志和简单事务查询日志显示在一起。

[因为这个问题可能会作为一个重复的问题结束。]

如果SQL Server还没有重新启动(并且计划还没有被清除等等)，您可能能够在计划缓存中找到该查询。

SELECT t.[text]
FROM sys.dm_exec_cached_plans AS p
CROSS APPLY sys.dm_exec_sql_text(p.plan_handle) AS t
WHERE t.[text] LIKE N'%something unique about your query%';

如果你因为Management Studio崩溃而丢失了文件，你可以在这里找到恢复文件:

C:\Users\<you>\Documents\SQL Server Management Studio\Backup Files\

否则，你将需要使用其他工具来帮助你保存查询历史，比如Ed Harper的回答中提到的SSMS Tools Pack——尽管它在SQL Server 2012+中不是免费的。或者您可以设置一些轻量级跟踪过滤您的登录名或主机名(但请使用服务器端跟踪，而不是Profiler)。

正如@Nenad-Zivkovic评论的那样，加入sys可能会有帮助。Dm_exec_query_stats和last_execution_time排序:

SELECT t.[text], s.last_execution_time
FROM sys.dm_exec_cached_plans AS p
INNER JOIN sys.dm_exec_query_stats AS s
   ON p.plan_handle = s.plan_handle
CROSS APPLY sys.dm_exec_sql_text(p.plan_handle) AS t
WHERE t.[text] LIKE N'%something unique about your query%'
ORDER BY s.last_execution_time DESC;