在SQLSERVER中查寻被阻塞和正在被阻塞的SQL

在SQLSERVER中查找被阻塞和正在被阻塞的SQL
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