SUSPENDED: 這意味着請求當前不是活動的,因爲它正在等待資源。該資源可以是讀取頁面的I/O,WAITit可以在網絡上進行通信,或者正在等待鎖定或鎖定。一旦等待的任務完成,它就會激活。例如,如果查詢發佈了一個I/O請求來讀取完整表tblStudents的數據,那麼這個任務將被暫停,直到I/O完成。一旦I/O完成(表tblStudents的數據在內存中可用),查詢將進入RUNNABLE隊列。
因此,如果它正在等待,請檢查wait_type列以瞭解它正在等待並根據wait_time進行故障排除。
我開發了以下程序,可以幫助我解決這個問題,它包含WAIT_TYPE。
use master
go
CREATE PROCEDURE [dbo].[sp_radhe]
AS
BEGIN
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT es.session_id AS session_id
,COALESCE(es.original_login_name, '') AS login_name
,COALESCE(es.host_name,'') AS hostname
,COALESCE(es.last_request_end_time,es.last_request_start_time) AS last_batch
,es.status
,COALESCE(er.blocking_session_id,0) AS blocked_by
,COALESCE(er.wait_type,'MISCELLANEOUS') AS waittype
,COALESCE(er.wait_time,0) AS waittime
,COALESCE(er.last_wait_type,'MISCELLANEOUS') AS lastwaittype
,COALESCE(er.wait_resource,'') AS waitresource
,coalesce(db_name(er.database_id),'No Info') as dbid
,COALESCE(er.command,'AWAITING COMMAND') AS cmd
,sql_text=st.text
,transaction_isolation =
CASE es.transaction_isolation_level
WHEN 0 THEN 'Unspecified'
WHEN 1 THEN 'Read Uncommitted'
WHEN 2 THEN 'Read Committed'
WHEN 3 THEN 'Repeatable'
WHEN 4 THEN 'Serializable'
WHEN 5 THEN 'Snapshot'
END
,COALESCE(es.cpu_time,0)
+ COALESCE(er.cpu_time,0) AS cpu
,COALESCE(es.reads,0)
+ COALESCE(es.writes,0)
+ COALESCE(er.reads,0)
+ COALESCE(er.writes,0) AS physical_io
,COALESCE(er.open_transaction_count,-1) AS open_tran
,COALESCE(es.program_name,'') AS program_name
,es.login_time
FROM sys.dm_exec_sessions es
LEFT OUTER JOIN sys.dm_exec_connections ec ON es.session_id = ec.session_id
LEFT OUTER JOIN sys.dm_exec_requests er ON es.session_id = er.session_id
LEFT OUTER JOIN sys.server_principals sp ON es.security_id = sp.sid
LEFT OUTER JOIN sys.dm_os_tasks ota ON es.session_id = ota.session_id
LEFT OUTER JOIN sys.dm_os_threads oth ON ota.worker_address = oth.worker_address
CROSS APPLY sys.dm_exec_sql_text(er.sql_handle) AS st
where es.is_user_process = 1
and es.session_id <> @@spid
ORDER BY es.session_id
end
下面的這個查詢還可以顯示基本信息,通過顯示spid正在等待哪個資源來暫停spid。
SELECT wt.session_id,
ot.task_state,
wt.wait_type,
wt.wait_duration_ms,
wt.blocking_session_id,
wt.resource_description,
es.[host_name],
es.[program_name]
FROM sys.dm_os_waiting_tasks wt
INNER JOIN sys.dm_os_tasks ot ON ot.task_address = wt.waiting_task_address
INNER JOIN sys.dm_exec_sessions es ON es.session_id = wt.session_id
WHERE es.is_user_process = 1
請參考下面的圖片爲例:
感謝您的SQL代碼段非常有用! – 99Sono