查找堵塞

 --查找堵塞源
 SELECT * FROM master.sys.sysprocesses  WHERE SPID>50 and blocked!=0   order by waittime desc 


 --堵塞源的堵塞类型
 SELECT 
 CASE  WHEN waittime!=0X0000 AND open_tran>=0 AND status='runnable' THEN N'运行时间太长' 
 WHEN waittime=0X0000 AND open_tran>0 AND status='sleeping' THEN N'sleeping进程事物未提交' 
 WHEN waittime in(0x0800,0x0063) AND open_tran>=0 AND status='runnable' THEN N'没有及时取走结果集' 
 WHEN waittime=0X0000 AND open_tran>0 AND status='rollback' THEN N'超时或主动回滚' 
 WHEN waittime>=0X0000 AND open_tran>=0 AND status='runnable' THEN N'死锁以堵塞体现' 
 END  AS Reason,
 b.text SQL
 FROM master.sys.sysprocesses a
 CROSS APPLY sys.dm_exec_sql_text(a.sql_handle) b 
 WHERE SPID=63