Sql Server 查看当前正在执行的Sql 语句

时间：2022-03-14 15:37

查看Sql Server 当前正在执行的Sql 语句，可以使用 sys.sysprocesses 或 sys.dm_exec_requests，由于sys.sysprocesses是为了向后兼容而保留的，所以，推荐使用DMV：sys.dm_exec_requests

一，使用sys.sysprocesses

Contains information about processes that are running on an instance of SQL Server. These processes can be client processes or system processes. To access sysprocesses, you must be in the master database context, or you must use the master.dbo.sysprocesses three-part name.

select p.spid,p.kpid,p.blocked,p.waittime,p.lastwaittype,
    p.waitresource,p.dbid,p.uid,p.cpu,p.physical_io,p.memusage,
    p.open_tran,p.status,p.hostname,p.program_name,
    p.cmd,p.nt_domain,p.nt_username,p.loginame,
    p.stmt_start,p.stmt_end,p.request_id,
    s.objectid,s.text as SqlStatement
from sys.sysprocesses p with(NOLOCK) 
outer apply sys.dm_exec_sql_text(p.sql_handle) s
where p.spid>50  
    and p.lastwaittype<>‘MISCELLANEOUS‘ 
    and p.status<>‘sleeping‘
    and p.spid<>@@spid
order by p.physical_io desc

@@SPID 表示当前的spid

一般来说，SPID<=50是system session，SPID>50的是User Session

LastWaitType 为‘MISCELLANEOUS‘ 时，it is not used for any valid wait. It is simply the default wait in a list and isn‘t used to indicate any real waiting.

关于LastWaitType ，请查看 http://blogs.msdn.com/b/psssql/archive/2009/11/03/the-sql-server-wait-type-repository.aspx

sql_handle 字段表示的查询的handle，当使用sys.dm_exec_sql_text函数获取Sql Statement时，Sql Server会对某些包含常量的查询语句“Auto-parameterized”，获取的Sql statement如下，

(@P1 int,@P2 int,@P3 datetime2(7),@P4 datetime2(7))
WITH CategoryIDs      AS 
(SELECT B.CategoryID,
  .....

stmt_start和stmt_end 这两个字段用于标识“Auto-parameterized”增加的语句的开始和结尾。

二，推荐使用DMV：sys.dm_exec_requests，

select    r.session_id,r.blocking_session_id,
        r.request_id,r.start_time,r.status,r.command,
        st.dbid,st.objectid,st.text as SqlStatement, 
        SUBSTRING (st.text, 
                    r.statement_start_offset/2,
                    (CASE WHEN r.statement_end_offset = -1 
                            THEN LEN(CONVERT(NVARCHAR(MAX), st.text)) * 2
                        ELSE r.statement_end_offset END 
                        - r.statement_start_offset)/2
                    ) as IndividualQueryStatement,
        r.database_id,r.user_id,r.connection_id,
        r.wait_type,r.wait_time,r.last_wait_type,r.wait_resource,r.open_transaction_count,
        r.percent_complete,r.estimated_completion_time,
        r.cpu_time,r.total_elapsed_time,r.reads,r.writes,r.logical_reads,
        r.transaction_isolation_level,r.lock_timeout,r.deadlock_priority,r.row_count,
        r.granted_query_memory,p.query_plan
from sys.dm_exec_requests r
outer APPLY sys.dm_exec_sql_text(r.sql_handle) as st
outer apply sys.dm_exec_query_plan(r.plan_handle) as p
where r.last_wait_type<>‘MISCELLANEOUS‘
    and r.session_id>50

三，使用DMV：sys.dm_exec_requests查看数据库block的状态

DMV：sys.dm_exec_requests 提供两个非常重要的字段是session_id，blocking_session_id

blocking_session_id

ID of the session that is blocking the request. If this column is NULL, the request is not blocked, or the session information of the blocking session is not available (or cannot be identified).

-2 = The blocking resource is owned by an orphaned distributed transaction.

-3 = The blocking resource is owned by a deferred recovery transaction.

-4 = Session ID of the blocking latch owner could not be determined at this time because of internal latch state transitions.

SELECT  R.session_id AS BlockedSessionID ,
        S.session_id AS BlockingSessionID ,
        Q1.text AS BlockedSession_TSQL ,
        Q2.text AS BlockingSession_TSQL ,
        C1.most_recent_sql_handle AS BlockedSession_SQLHandle ,
        C2.most_recent_sql_handle AS BlockingSession_SQLHandle ,
        S.original_login_name AS BlockingSession_LoginName ,
        S.program_name AS BlockingSession_ApplicationName ,
        S.host_name AS BlockingSession_HostName
FROM  sys.dm_exec_requests AS R
INNER JOIN sys.dm_exec_sessions AS S ON R.blocking_session_id = S.session_id
INNER JOIN sys.dm_exec_connections AS C1 ON R.session_id = C1.most_recent_session_id
INNER JOIN sys.dm_exec_connections AS C2 ON S.session_id = C2.most_recent_session_id
CROSS APPLY sys.dm_exec_sql_text(C1.most_recent_sql_handle) AS Q1
CROSS APPLY sys.dm_exec_sql_text(C2.most_recent_sql_handle) AS Q2

Appendix

如果已经知道SPID，可以使用dbcc inputbuffer(spid)来获取spid执行的sql语句。

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