SQL_数据库堵塞问题

1.查询被锁进程

SELECT spid 被锁进程ID, 
	blocked 锁进程ID,
	status 被锁状态, 
	login_time 登录时间, 
	SUBSTRING(SUSER_SNAME(sid),1,30) 被锁进程登陆帐号, 
	SUBSTRING(hostname,1,12) 被锁进程用户机器名称, 
	SUBSTRING(DB_NAME(dbid),1,13) 被锁进程数据名称, 
	cmd 被锁进程命令, 
	waittype 被锁进程等待类型
FROM master.sys.sysprocesses  
WHERE SPID>50 and blocked!=0 AND spid<>blocked   
order by waittime desc 

2.查询堵塞源类型

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,
	DB_NAME(a.dbid) as DB,
	program_name,
	hostname,
	loginame
FROM master.sys.sysprocesses a CROSS APPLY sys.dm_exec_sql_text(a.sql_handle) b 
WHERE SPID=450
--这里的where条件中的SPID就是被锁进程ID。另外需要记录锁进程的SQL语句，之后优化这个SQL语句。
--KILL 450     就是直接杀死这个进程，解决锁的问题 

3.查询回话信息

select s.session_id,s.status,s.login_time,s.host_name,
	s.program_name,s.host_process_id,s.client_version,
	s.client_interface_name,s.login_name,s.last_request_start_time,
	s.last_request_end_time,c.connect_time,c.net_transport,
	c.net_packet_size,c.client_net_address,r.request_id,r.start_time,
	r.status,r.command,r.database_id,r.user_id,r.blocking_session_id,
	r.wait_type,r.wait_time,r.last_wait_type,r.wait_resource,
	r.open_transaction_count,r.transaction_id,r.percent_complete,
	r.cpu_time,r.reads,r.writes,r.granted_query_memory
from sys.dm_exec_requests r
right outer join sys.dm_exec_sessions s on r.session_id=s.session_id
right outer join sys.dm_exec_connections  c on s.session_id=c.session_id
where s.is_user_process=1