人人都是 DBA（XV）锁信息收集脚本汇编

原文:

什么？有个 SQL 执行了 8 秒！

哪里出了问题？臣妾不知道啊，得找 DBA 啊。

DBA 人呢？离职了！！擦！！！

程序员在无处寻求帮助时，就得想办法自救，努力让自己变成 "伪 DBA"。

索引

查看 Session 对应的 Thread 和当前 Command

SELECT r.session_id
    ,t.os_thread_id
    ,r.command
FROM sys.dm_exec_requests AS r
JOIN sys.dm_os_workers AS w ON r.task_address = w.task_address
JOIN sys.dm_os_threads AS t ON t.thread_address = w.thread_address
ORDER BY session_id;

侦测 Deadlocking 或阻塞问题

SELECT t1.resource_type AS [lock type]
    ,DB_NAME(resource_database_id) AS [database]
    ,t1.resource_associated_entity_id AS [blk object]
    ,t1.request_mode AS [lock req]
    ,t1.request_session_id AS [waiter sid]
    ,t2.wait_duration_ms AS [wait time]
    ,(
        SELECT [text]
        FROM sys.dm_exec_requests AS r WITH (NOLOCK)
        CROSS APPLY sys.dm_exec_sql_text(r.[sql_handle])
        WHERE r.session_id = t1.request_session_id
        ) AS [waiter_batch]
    ,(
        SELECT SUBSTRING(qt.[text], r.statement_start_offset / 2, (
                    CASE 
                        WHEN r.statement_end_offset = - 1
                            THEN LEN(CONVERT(NVARCHAR(max), qt.[text])) * 2
                        ELSE r.statement_end_offset
                        END - r.statement_start_offset
                    ) / 2)
        FROM sys.dm_exec_requests AS r WITH (NOLOCK)
        CROSS APPLY sys.dm_exec_sql_text(r.[sql_handle]) AS qt
        WHERE r.session_id = t1.request_session_id
        ) AS [waiter_stmt]
    ,t2.blocking_session_id AS [blocker sid]
    ,(
        SELECT [text]
        FROM sys.sysprocesses AS p
        CROSS APPLY sys.dm_exec_sql_text(p.[sql_handle])
        WHERE p.spid = t2.blocking_session_id
        ) AS [blocker_stmt]
FROM sys.dm_tran_locks AS t1 WITH (NOLOCK)
INNER JOIN sys.dm_os_waiting_tasks AS t2 WITH (NOLOCK) ON t1.lock_owner_address = t2.resource_address
OPTION (RECOMPILE);

这个查询需要执行多次，即使这样可能什么也查不到，为什么呢？因为没有死锁发生啊！

SELECT L.request_session_id AS SPID
    ,DB_NAME(L.resource_database_id) AS DatabaseName
    ,O.NAME AS LockedObjectName
    ,P.object_id AS LockedObjectId
    ,L.resource_type AS LockedResource
    ,L.request_mode AS LockType
    ,ST.TEXT AS SqlStatementText
    ,ES.login_name AS LoginName
    ,ES.host_name AS HostName
    ,TST.is_user_transaction AS IsUserTransaction
    ,AT.[name] AS TransactionName
    ,CN.auth_scheme AS AuthenticationMethod
FROM sys.dm_tran_locks L
JOIN sys.partitions P ON P.hobt_id = L.resource_associated_entity_id
JOIN sys.objects O ON O.object_id = P.object_id
JOIN sys.dm_exec_sessions ES ON ES.session_id = L.request_session_id
JOIN sys.dm_tran_session_transactions TST ON ES.session_id = TST.session_id
JOIN sys.dm_tran_active_transactions AT ON TST.transaction_id = AT.transaction_id
JOIN sys.dm_exec_connections CN ON CN.session_id = ES.session_id
CROSS APPLY sys.dm_exec_sql_text(CN.most_recent_sql_handle) AS ST
WHERE resource_database_id = db_id()
ORDER BY L.request_session_id

上面是另一个侦测脚本。

查看 Task 执行中哪个 Wait Type 最慢

如果需要清理已存在的 Wait 信息，则可执行：

DBCC SQLPERF(‘sys.dm_os_wait_stats‘, CLEAR);

然后，可以从清理后的时间点开始统计 Wait 信息。

WITH [Waits]
AS (
    SELECT wait_type
        ,wait_time_ms / 1000.0 AS [WaitS]
        ,(wait_time_ms - signal_wait_time_ms) / 1000.0 AS [ResourceS]
        ,signal_wait_time_ms / 1000.0 AS [SignalS]
        ,waiting_tasks_count AS [WaitCount]
        ,100.0 * wait_time_ms / SUM(wait_time_ms) OVER () AS [Percentage]
        ,ROW_NUMBER() OVER (
            ORDER BY wait_time_ms DESC
            ) AS [RowNum]
    FROM sys.dm_os_wait_stats WITH (NOLOCK)
    WHERE [wait_type] NOT IN (
            N‘BROKER_EVENTHANDLER‘
            ,N‘BROKER_RECEIVE_WAITFOR‘
            ,N‘BROKER_TASK_STOP‘
            ,N‘BROKER_TO_FLUSH‘
            ,N‘BROKER_TRANSMITTER‘
            ,N‘CHECKPOINT_QUEUE‘
            ,N‘CHKPT‘
            ,N‘CLR_AUTO_EVENT‘
            ,N‘CLR_MANUAL_EVENT‘
            ,N‘CLR_SEMAPHORE‘
            ,N‘DBMIRROR_DBM_EVENT‘
            ,N‘DBMIRROR_EVENTS_QUEUE‘
            ,N‘DBMIRROR_WORKER_QUEUE‘
            ,N‘DBMIRRORING_CMD‘
            ,N‘DIRTY_PAGE_POLL‘
            ,N‘DISPATCHER_QUEUE_SEMAPHORE‘
            ,N‘EXECSYNC‘
            ,N‘FSAGENT‘
            ,N‘FT_IFTS_SCHEDULER_IDLE_WAIT‘
            ,N‘FT_IFTSHC_MUTEX‘
            ,N‘HADR_CLUSAPI_CALL‘
            ,N‘HADR_FILESTREAM_IOMGR_IOCOMPLETION‘
            ,N‘HADR_LOGCAPTURE_WAIT‘
            ,N‘HADR_NOTIFICATION_DEQUEUE‘
            ,N‘HADR_TIMER_TASK‘
            ,N‘HADR_WORK_QUEUE‘
            ,N‘KSOURCE_WAKEUP‘
            ,N‘LAZYWRITER_SLEEP‘
            ,N‘LOGMGR_QUEUE‘
            ,N‘ONDEMAND_TASK_QUEUE‘
            ,N‘PWAIT_ALL_COMPONENTS_INITIALIZED‘
            ,N‘QDS_PERSIST_TASK_MAIN_LOOP_SLEEP‘
            ,N‘QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP‘
            ,N‘REQUEST_FOR_DEADLOCK_SEARCH‘
            ,N‘RESOURCE_QUEUE‘
            ,N‘SERVER_IDLE_CHECK‘
            ,N‘SLEEP_BPOOL_FLUSH‘
            ,N‘SLEEP_DBSTARTUP‘
            ,N‘SLEEP_DCOMSTARTUP‘
            ,N‘SLEEP_MASTERDBREADY‘
            ,N‘SLEEP_MASTERMDREADY‘
            ,N‘SLEEP_MASTERUPGRADED‘
            ,N‘SLEEP_MSDBSTARTUP‘
            ,N‘SLEEP_SYSTEMTASK‘
            ,N‘SLEEP_TASK‘
            ,N‘SLEEP_TEMPDBSTARTUP‘
            ,N‘SNI_HTTP_ACCEPT‘
            ,N‘SP_SERVER_DIAGNOSTICS_SLEEP‘
            ,N‘SQLTRACE_BUFFER_FLUSH‘
            ,N‘SQLTRACE_INCREMENTAL_FLUSH_SLEEP‘
            ,N‘SQLTRACE_WAIT_ENTRIES‘
            ,N‘WAIT_FOR_RESULTS‘
            ,N‘WAITFOR‘
            ,N‘WAITFOR_TASKSHUTDOWN‘
            ,N‘WAIT_XTP_HOST_WAIT‘
            ,N‘WAIT_XTP_OFFLINE_CKPT_NEW_LOG‘
            ,N‘WAIT_XTP_CKPT_CLOSE‘
            ,N‘XE_DISPATCHER_JOIN‘
            ,N‘XE_DISPATCHER_WAIT‘
            ,N‘XE_TIMER_EVENT‘
            )
        AND waiting_tasks_count > 0
    )
SELECT MAX(W1.wait_type) AS [WaitType]
    ,CAST(MAX(W1.WaitS) AS DECIMAL(16, 2)) AS [Wait_Sec]
    ,CAST(MAX(W1.ResourceS) AS DECIMAL(16, 2)) AS [Resource_Sec]
    ,CAST(MAX(W1.SignalS) AS DECIMAL(16, 2)) AS [Signal_Sec]
    ,MAX(W1.WaitCount) AS [Wait Count]
    ,CAST(MAX(W1.Percentage) AS DECIMAL(5, 2)) AS [Wait Percentage]
    ,CAST((MAX(W1.WaitS) / MAX(W1.WaitCount)) AS DECIMAL(16, 4)) AS [AvgWait_Sec]
    ,CAST((MAX(W1.ResourceS) / MAX(W1.WaitCount)) AS DECIMAL(16, 4)) AS [AvgRes_Sec]
    ,CAST((MAX(W1.SignalS) / MAX(W1.WaitCount)) AS DECIMAL(16, 4)) AS [AvgSig_Sec]
FROM Waits AS W1
INNER JOIN Waits AS W2 ON W2.RowNum <= W1.RowNum
GROUP BY W1.RowNum
HAVING SUM(W2.Percentage) - MAX(W1.Percentage) < 99 -- percentage threshold
OPTION (RECOMPILE);

关于 Wait Type 的描述可参考：

查看当前 Task 的运行情况

SELECT AVG(current_tasks_count) AS [Avg Task Count]
    ,AVG(runnable_tasks_count) AS [Avg Runnable Task Count]
    ,AVG(pending_disk_io_count) AS [Avg Pending DiskIO Count]
FROM sys.dm_os_schedulers WITH (NOLOCK)
WHERE scheduler_id < 255
OPTION (RECOMPILE);

上面的 SQL 需要运行多次来查看结果，如果某个值持续的大于 10 则说明可能有问题，需要进一步调查。

• 较高的 Avg Task Count 通常由 Blocking 或 Deadlocking 引起，或者其他资源竞争。
• 较高的 Avg Runnable Task Count 说明正在执行的任务很多，CPU 可能有压力。
• 较高的 Avg Pending DiskIO Count 说明等待的磁盘 IO 很多，Disk 可能有压力。

查看 Lock Waits 状态

SELECT o.[name] AS [table_name]
    ,i.[name] AS [index_name]
    ,ios.index_id
    ,ios.partition_number
    ,SUM(ios.row_lock_wait_count) AS [total_row_lock_waits]
    ,SUM(ios.row_lock_wait_in_ms) AS [total_row_lock_wait_in_ms]
    ,SUM(ios.page_lock_wait_count) AS [total_page_lock_waits]
    ,SUM(ios.page_lock_wait_in_ms) AS [total_page_lock_wait_in_ms]
    ,SUM(ios.page_lock_wait_in_ms) + SUM(row_lock_wait_in_ms) AS [total_lock_wait_in_ms]
FROM sys.dm_db_index_operational_stats(DB_ID(), NULL, NULL, NULL) AS ios
INNER JOIN sys.objects AS o WITH (NOLOCK) ON ios.[object_id] = o.[object_id]
INNER JOIN sys.indexes AS i WITH (NOLOCK) ON ios.[object_id] = i.[object_id]
    AND ios.index_id = i.index_id
WHERE o.[object_id] > 100
GROUP BY o.[name]
    ,i.[name]
    ,ios.index_id
    ,ios.partition_number
HAVING SUM(ios.page_lock_wait_in_ms) + SUM(row_lock_wait_in_ms) > 0
ORDER BY total_lock_wait_in_ms DESC
OPTION (RECOMPILE);

查看 Latch 等待情况

SELECT *
FROM sys.dm_os_latch_stats
WHERE wait_time_ms > 10
ORDER BY 2 DESC;

SELECT *
FROM sys.dm_os_wait_stats
WHERE waiting_tasks_count > 20
    AND wait_type LIKE ‘%LATCH%‘
ORDER BY 3 DESC;

SELECT *
FROM sys.dm_os_spinlock_stats
ORDER BY [spins] DESC;

WITH [Latches]
AS (
    SELECT [latch_class]
        ,[wait_time_ms] / 1000.0 AS [WaitS]
        ,[waiting_requests_count] AS [WaitCount]
        ,100.0 * [wait_time_ms] / SUM([wait_time_ms]) OVER () AS [Percentage]
        ,ROW_NUMBER() OVER (
            ORDER BY [wait_time_ms] DESC
            ) AS [RowNum]
    FROM sys.dm_os_latch_stats
    WHERE [latch_class] NOT IN (N‘BUFFER‘)
        --AND [wait_time_ms] > 0
    )
SELECT MAX([W1].[latch_class]) AS [LatchClass]
    ,CAST(MAX([W1].[WaitS]) AS DECIMAL(14, 2)) AS [Wait_S]
    ,MAX([W1].[WaitCount]) AS [WaitCount]
    ,CAST(MAX([W1].[Percentage]) AS DECIMAL(14, 2)) AS [Percentage]
    ,CAST((MAX([W1].[WaitS]) / MAX([W1].[WaitCount])) AS DECIMAL(14, 4)) AS [AvgWait_S]
FROM [Latches] AS [W1]
INNER JOIN [Latches] AS [W2] ON [W2].[RowNum] <= [W1].[RowNum]
GROUP BY [W1].[RowNum]
HAVING SUM([W2].[Percentage]) - MAX([W1].[Percentage]) < 95;-- percentage threshold

将所有 wait_type 按照等待时间排序

/*
SQL Server Wait Information from sys.dm_os_wait_stats
Copyright (C) 2014, Brent Ozar Unlimited.
See http://BrentOzar.com/go/eula for the End User Licensing Agreement.
*/

/*********************************
Let‘s build a list of waits we can safely ignore.
*********************************/
IF OBJECT_ID(‘tempdb..#ignorable_waits‘) IS NOT NULL
    DROP TABLE #ignorable_waits;
GO

create table #ignorable_waits (wait_type nvarchar(256) PRIMARY KEY);
GO

/* We aren‘t using row constructors to be SQL 2005 compatible */
set nocount on;
insert #ignorable_waits (wait_type) VALUES (‘REQUEST_FOR_DEADLOCK_SEARCH‘);
insert #ignorable_waits (wait_type) VALUES (‘SQLTRACE_INCREMENTAL_FLUSH_SLEEP‘);
insert #ignorable_waits (wait_type) VALUES (‘SQLTRACE_BUFFER_FLUSH‘);
insert #ignorable_waits (wait_type) VALUES (‘LAZYWRITER_SLEEP‘);
insert #ignorable_waits (wait_type) VALUES (‘XE_TIMER_EVENT‘);
insert #ignorable_waits (wait_type) VALUES (‘XE_DISPATCHER_WAIT‘);
insert #ignorable_waits (wait_type) VALUES (‘FT_IFTS_SCHEDULER_IDLE_WAIT‘);
insert #ignorable_waits (wait_type) VALUES (‘LOGMGR_QUEUE‘);
insert #ignorable_waits (wait_type) VALUES (‘CHECKPOINT_QUEUE‘);
insert #ignorable_waits (wait_type) VALUES (‘BROKER_TO_FLUSH‘);
insert #ignorable_waits (wait_type) VALUES (‘BROKER_TASK_STOP‘);
insert #ignorable_waits (wait_type) VALUES (‘BROKER_EVENTHANDLER‘);
insert #ignorable_waits (wait_type) VALUES (‘SLEEP_TASK‘);
insert #ignorable_waits (wait_type) VALUES (‘WAITFOR‘);
insert #ignorable_waits (wait_type) VALUES (‘DBMIRROR_DBM_MUTEX‘)
insert #ignorable_waits (wait_type) VALUES (‘DBMIRROR_EVENTS_QUEUE‘)
insert #ignorable_waits (wait_type) VALUES (‘DBMIRRORING_CMD‘);
insert #ignorable_waits (wait_type) VALUES (‘DISPATCHER_QUEUE_SEMAPHORE‘);
insert #ignorable_waits (wait_type) VALUES (‘BROKER_RECEIVE_WAITFOR‘);
insert #ignorable_waits (wait_type) VALUES (‘CLR_AUTO_EVENT‘);
insert #ignorable_waits (wait_type) VALUES (‘DIRTY_PAGE_POLL‘);
insert #ignorable_waits (wait_type) VALUES (‘HADR_FILESTREAM_IOMGR_IOCOMPLETION‘);
insert #ignorable_waits (wait_type) VALUES (‘ONDEMAND_TASK_QUEUE‘);
insert #ignorable_waits (wait_type) VALUES (‘FT_IFTSHC_MUTEX‘);
insert #ignorable_waits (wait_type) VALUES (‘CLR_MANUAL_EVENT‘);
insert #ignorable_waits (wait_type) VALUES (‘SP_SERVER_DIAGNOSTICS_SLEEP‘);
insert #ignorable_waits (wait_type) VALUES (‘QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP‘);
insert #ignorable_waits (wait_type) VALUES (‘QDS_PERSIST_TASK_MAIN_LOOP_SLEEP‘);
GO

/* Want to manually exclude an event and recalculate?*/
/* insert #ignorable_waits (wait_type) VALUES (‘‘); */

/*********************************
What are the highest overall waits since startup?
*********************************/
SELECT TOP 25
    os.wait_type,
    SUM(os.wait_time_ms) OVER (PARTITION BY os.wait_type) as sum_wait_time_ms,
    CAST(
        100.* SUM(os.wait_time_ms) OVER (PARTITION BY os.wait_type)
        / (1. * SUM(os.wait_time_ms) OVER () )
        AS NUMERIC(12,1)) as pct_wait_time,
    SUM(os.waiting_tasks_count) OVER (PARTITION BY os.wait_type) AS sum_waiting_tasks,
    CASE WHEN  SUM(os.waiting_tasks_count) OVER (PARTITION BY os.wait_type) > 0
    THEN
        CAST(
            SUM(os.wait_time_ms) OVER (PARTITION BY os.wait_type)
                / (1. * SUM(os.waiting_tasks_count) OVER (PARTITION BY os.wait_type))
            AS NUMERIC(12,1))
    ELSE 0 END AS avg_wait_time_ms,
    CURRENT_TIMESTAMP as sample_time
FROM sys.dm_os_wait_stats os
LEFT JOIN #ignorable_waits iw on
    os.wait_type=iw.wait_type
WHERE
    iw.wait_type is null
ORDER BY sum_wait_time_ms DESC;
GO

/*********************************
What are the higest waits *right now*?
*********************************/

/* Note: this is dependent on the #ignorable_waits table created earlier. */
if OBJECT_ID(‘tempdb..#wait_batches‘) is not null
    drop table #wait_batches;
if OBJECT_ID(‘tempdb..#wait_data‘) is not null
    drop table #wait_data;
GO

CREATE TABLE #wait_batches (
    batch_id int identity primary key,
    sample_time datetime not null
);
CREATE TABLE #wait_data
    ( batch_id INT NOT NULL ,
      wait_type NVARCHAR(256) NOT NULL ,
      wait_time_ms BIGINT NOT NULL ,
      waiting_tasks BIGINT NOT NULL
    );
CREATE CLUSTERED INDEX cx_wait_data on #wait_data(batch_id);
GO

/*
This temporary procedure records wait data to a temp table.
*/
if OBJECT_ID(‘tempdb..#get_wait_data‘) IS NOT NULL
    DROP procedure #get_wait_data;
GO
CREATE PROCEDURE #get_wait_data
    @intervals tinyint = 2,
    @delay char(12)=‘00:00:30.000‘ /* 30 seconds*/
AS
DECLARE @batch_id int,
    @current_interval tinyint,
    @msg nvarchar(max);

SET NOCOUNT ON;
SET @current_interval=1;

WHILE @current_interval <= @intervals
BEGIN
    INSERT #wait_batches(sample_time)
    SELECT CURRENT_TIMESTAMP;

    SELECT @batch_id=SCOPE_IDENTITY();

    INSERT #wait_data (batch_id, wait_type, wait_time_ms, waiting_tasks)
    SELECT
        @batch_id,
        os.wait_type,
        SUM(os.wait_time_ms) OVER (PARTITION BY os.wait_type) as sum_wait_time_ms,
        SUM(os.waiting_tasks_count) OVER (PARTITION BY os.wait_type) AS sum_waiting_tasks
    FROM sys.dm_os_wait_stats os
    LEFT JOIN #ignorable_waits iw on
        os.wait_type=iw.wait_type
    WHERE
        iw.wait_type is null
    ORDER BY sum_wait_time_ms DESC;

    set @msg= CONVERT(char(23),CURRENT_TIMESTAMP,121)+ N‘: Completed sample ‘
        + cast(@current_interval as nvarchar(4))
        + N‘ of ‘ + cast(@intervals as nvarchar(4)) +
        ‘.‘
    RAISERROR (@msg,0,1) WITH NOWAIT;

    SET @current_interval=@current_interval+1;

    if @current_interval <= @intervals
        WAITFOR DELAY @delay;
END
GO

/*
Let‘s take two samples 30 seconds apart
*/
exec #get_wait_data @intervals=2, @delay=‘00:00:30.000‘;
GO

/*
What were we waiting on?
This query compares the most recent two samples.
*/
with max_batch as (
    select top 1 batch_id, sample_time
    from #wait_batches
    order by batch_id desc
)
SELECT
    b.sample_time as [Second Sample Time],
    datediff(ss,wb1.sample_time, b.sample_time) as [Sample Duration in Seconds],
    wd1.wait_type,
    cast((wd2.wait_time_ms-wd1.wait_time_ms)/1000. as numeric(12,1)) as [Wait Time (Seconds)],
    (wd2.waiting_tasks-wd1.waiting_tasks) AS [Number of Waits],
    CASE WHEN (wd2.waiting_tasks-wd1.waiting_tasks) > 0
    THEN
        cast((wd2.wait_time_ms-wd1.wait_time_ms)/
            (1.0*(wd2.waiting_tasks-wd1.waiting_tasks)) as numeric(12,1))
    ELSE 0 END AS [Avg ms Per Wait]
FROM  max_batch b
JOIN #wait_data wd2 on
    wd2.batch_id=b.batch_id
JOIN #wait_data wd1 on
    wd1.wait_type=wd2.wait_type AND
    wd2.batch_id - 1 = wd1.batch_id
join #wait_batches wb1 on
    wd1.batch_id=wb1.batch_id
WHERE (wd2.waiting_tasks-wd1.waiting_tasks) > 0
ORDER BY [Wait Time (Seconds)] DESC;
GO

查看当前数据库中正在执行的 SQL 在等待什么

SELECT SUBSTRING(st.TEXT, (qs.statement_start_offset / 2) + 1, (
            (
                (
                    CASE qs.statement_end_offset
                        WHEN - 1
                            THEN DATALENGTH(st.[text])
                        ELSE qs.statement_end_offset
                        END
                    ) - qs.statement_start_offset
                ) / 2
            ) + 1) AS [sql]
    ,DB_NAME(er.database_id) AS [db_name]
    ,es.login_name
    ,ec.client_net_address
    ,er.command AS request_command
    ,er.start_time AS request_start_time
    ,wt.wait_duration_ms AS waiting_duration
    ,wt.wait_type AS waiting_type
    ,ot.task_state
    ,ec.connection_id
    ,ec.session_id
    ,es.[status] AS session_status
    ,CASE es.transaction_isolation_level
        WHEN 0
            THEN ‘Unspecified‘
        WHEN 1
            THEN ‘Read Uncomitted‘
        WHEN 2
            THEN ‘Read Committed‘
        WHEN 3
            THEN ‘Repeatable‘
        WHEN 4
            THEN ‘Serializable‘
        WHEN 5
            THEN ‘Snapshot‘
        END AS transaction_isolation_level
    ,er.request_id
    ,er.[status] AS request_status
    ,USER_NAME(er.[user_id]) AS [request_user]
    ,er.wait_type AS request_blocked_type
    ,er.wait_time AS request_blocked_time
    ,ec.connect_time
    ,es.login_time
    ,er.cpu_time
    ,os.cpu_id
    ,os.scheduler_id
    ,th.os_thread_id
    ,er.task_address
    ,ot.worker_address
    ,th.thread_address
    ,CASE 
        WHEN er.[sql_handle] IS NULL
            THEN ec.most_recent_sql_handle
        ELSE er.[sql_handle]
        END AS [sql_handle]
FROM sys.dm_exec_connections AS ec
INNER JOIN sys.dm_exec_sessions AS es ON es.session_id = ec.session_id
LEFT OUTER JOIN sys.dm_exec_requests AS er ON er.connection_id = ec.connection_id
INNER JOIN sys.dm_os_tasks ot ON er.task_address = ot.task_address
    OR er.task_address = ot.parent_task_address
LEFT OUTER JOIN sys.dm_os_workers AS ow ON ow.worker_address = ot.worker_address
LEFT OUTER JOIN sys.dm_os_threads AS th ON th.thread_address = ow.thread_address
LEFT OUTER JOIN sys.dm_os_schedulers AS os ON os.scheduler_id = ot.scheduler_id
LEFT OUTER JOIN sys.dm_os_waiting_tasks AS wt ON wt.waiting_task_address = ot.task_address
LEFT OUTER JOIN sys.dm_exec_query_stats AS qs ON qs.[sql_handle] = (
        CASE 
            WHEN er.[sql_handle] IS NULL
                THEN ec.most_recent_sql_handle
            ELSE er.[sql_handle]
            END
        )
CROSS APPLY sys.dm_exec_sql_text(CASE 
            WHEN er.[sql_handle] IS NULL
                THEN ec.most_recent_sql_handle
            ELSE er.[sql_handle]
            END) AS st
WHERE er.database_id = DB_ID()
    AND er.request_id IS NOT NULL
    AND wt.wait_duration_ms > 0
    AND st.[text] NOT LIKE ‘%statement_start_offset%‘
ORDER BY wt.wait_duration_ms DESC;

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