数据库查询超级慢，数据库死锁的查看与解决

今天帮同事解决问题，页面报“等待的操作过时”，设置断点发现数据库查询语句处异常（提示：已超过了锁请求超时时段。），检查了数据库一通，发现连接数据库也连接不上了，搜了一圈找到解决办法。留着备用啦

首先查出死锁，可用sql语句
SELECT blocking_session_id '阻塞进程的ID', wait_duration_ms '等待时间(毫秒)', session_id '(会话ID)' FROM sys.dm_os_waiting_tasks

或者创建以下存储过程，查询出来

USE [master]
GO
/****** Object:  StoredProcedure [dbo].[sp_who_lock]    Script Date: 01/03/2017 10:58:03 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER procedure [dbo].[sp_who_lock]

as

begin

declare @spid int,@bl int,

 @intTransactionCountOnEntry  int,

        @intRowcount    int,

        @intCountProperties   int,

        @intCounter    int



 create table #tmp_lock_who (

 id int identity(1,1),

 spid smallint,

 bl smallint)

 

 IF @@ERROR<>0 RETURN @@ERROR

 

 insert into #tmp_lock_who(spid,bl) select  0 ,blocked

   from (select * from sysprocesses where  blocked>0 ) a 

   where not exists(select * from (select * from sysprocesses where  blocked>0 ) b 

   where a.blocked=spid)

   union select spid,blocked from sysprocesses where  blocked>0



 IF @@ERROR<>0 RETURN @@ERROR 

  

-- 找到临时表的记录数
 select  @intCountProperties = Count(*),@intCounter = 1

 from #tmp_lock_who

 

 IF @@ERROR<>0 RETURN @@ERROR 

 

 if @intCountProperties=0

  select '现在没有阻塞和死锁信息' as message



-- 循环开始
while @intCounter <= @intCountProperties

begin

-- 取第一条记录
  select  @spid = spid,@bl = bl

  from #tmp_lock_who where Id = @intCounter 

 begin

  if @spid =0 

            select '引起数据库死锁的是: '+ CAST(@bl AS VARCHAR(10)) + '进程号,其执行的SQL语法如下'

 else

            select '进程号SPID：'+ CAST(@spid AS VARCHAR(10))+ '被' + '进程号SPID：'+ CAST(@bl AS VARCHAR(10)) +'阻塞,其当前进程执行的SQL语法如下'

 DBCC INPUTBUFFER (@bl )

 end 



-- 循环指针下移
 set @intCounter = @intCounter + 1

end



drop table #tmp_lock_who



return 0

end

通过以上便可查出死锁进程ID，执行 kill 死锁进程ID  即可（kill 63）