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如何判断数据库的死锁
use master
go
declare @spid int,@bl int
DECLARE s_cur CURSOR FOR
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
OPEN s_cur
FETCH NEXT FROM s_cur INTO @spid,@bl
WHILE @@FETCH_STATUS = 0
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 )
FETCH NEXT FROM s_cur INTO @spid,@bl
end
CLOSE s_cur
DEALLOCATE s_cur
exec sp_lock
--检查一个连接当前所持有的锁
select request_session_id,resource_type, resource_associated_entity_id,
request_status, request_mode,
resource_description
FROM sys.dm_tran_locks
--当然我们也可以结合其他的动态管理视图,直接查出某个数据库上面的锁是在哪些表格,以及在哪些索引上面。例如(图9-3):
use AdventureWorks
go
SELECT request_session_id,resource_type, resource_associated_entity_id,
request_status, request_mode,
resource_description, p.object_id,object_name(p.object_id) as object_name, p.*
FROM sys.dm_tran_locks left join sys.partitions p
on sys.dm_tran_locks.resource_associated_entity_id = p.hobt_id
WHERE resource_database_id = db_id('AdventureWorks')
order by request_session_id, resource_type, resource_associated_entity_id
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sp_who_lock]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) drop procedure [dbo].[sp_who_lock] GO use master go create procedure 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 @spidspid = spid,@blbl = 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