第十六章——处理锁、阻塞和死锁（2）——侦测阻塞和阻塞查询

--1)查询被阻塞和正在阻塞的查询：
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