查询SQL数据库死锁

使用sqlserver作为数据库的应用系统,都避免不了有时候会产生死锁， 死锁出现以后，维护人员或者开发人员大多只会通过sp_who来查找死锁的进程，然后用sp_kill杀掉。利用sp_who_lock这个存储过程，可以很方便的知道哪个进程出现了死锁，出现死锁的问题在哪里.

创建sp_who_lock存储过程

CREATE procedure sp_who_lock
as
begin
   declare @spid int
   declare @blk int
   declare @count int
   declare @index int
   declare @lock tinyint
   set @lock=0
   create table #temp_who_lock
 (
  id int identity(1,1),
  spid int,
  blk int
 )
 if @@error<>0 return @@error
 insert into #temp_who_lock(spid,blk)
 select 0 ,blocked
 from (select * from master..sysprocesses where blocked>0)a
 where not exists(select * from  master..sysprocesses where a.blocked =spid and blocked>0)
 union select spid,blocked from  master..sysprocesses where blocked>0
 if @@error<>0 return @@error
 select @count=count(*),@index=1 from #temp_who_lock
 if @@error<>0 return @@error
 if @count=0
 begin
  select ‘没有阻塞和死锁信息‘
  return 0
 end
 while @index<=@count
 begin
  if exists(select 1 from #temp_who_lock a where id>@index and exists(select 1 from #temp_who_lock where id<=@index and a.blk=spid))
  begin
   set @lock=1
   select @spid=spid,@blk=blk from #temp_who_lock where id=@index
   select ‘引起数据库死锁的是: ‘+ CAST(@spid AS VARCHAR(10)) + ‘进程号,其执行的SQL语法如下‘
   select  @spid, @blk
   dbcc inputbuffer(@spid)
   dbcc inputbuffer(@blk)
  end
  set @index=@index+1
 end
 if @lock=0
 begin
  set @index=1
  while @index<=@count
  begin
   select @spid=spid,@blk=blk from #temp_who_lock where id=@index
   if @spid=0
    select ‘引起阻塞的是:‘+cast(@blk 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(@blk AS VARCHAR(10)) +‘阻塞,其当前进程执行的SQL语法如下‘
   dbcc inputbuffer(@spid)
   dbcc inputbuffer(@blk)
   set @index=@index+1
  end
 end
 drop table #temp_who_lock
 return 0
end            

GO