一、破壞死鎖的四個必要條件

二、如果發生死鎖，通過SQL語句關閉當前發生死鎖的數據庫進程

USE master --不能用 KILL 來取消您自己的進程。

GO
/****** Object:? StoredProcedure [dbo].[p_Centaline_Who_Lock]??? Script Date: 03/23/2016 11:54:38 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_killspid]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[p_killspid]
GO

create proc p_killspid
@dbname varchar(200)??? --要關閉進程的數據庫名
as?
??? declare @sql? nvarchar(500)?
??? declare @spid nvarchar(20)

??? declare #tb cursor for
??????? select spid=cast(spid as varchar(20)) from master..sysprocesses where dbid=db_id(@dbname)
??? open #tb
??? fetch next from #tb into @spid
??? while @@fetch_status=0
??? begin?
??????? exec('kill '+@spid)
??????? fetch next from #tb into @spid
??? end?
??? close #tb
??? deallocate #tb
go

?

調用

exec p_killspid? '需要關閉進程的數據庫名'? 當強制關閉進程后，死鎖也就沒有了

?

?

二、查看當前數據庫下鎖的情況

CREATE Table #Who(

??? spid int,

??? ecid int,

??? [status] nvarchar(50),

??? loginname nvarchar(50),

??? hostname nvarchar(50),

??? blk int,

??? dbname nvarchar(50),

??? cmd nvarchar(50)

??? --request_ID int

??? );

?

CREATE Table #Lock(

??? spid int,

??? dpid int,

??? [objid] int,

??? indld int,

??? [Type] nvarchar(20),

??? [Resource] nvarchar(50),

??? Mode nvarchar(10),

??? [Status] nvarchar(10)

);

?

INSERT INTO #Who

??? EXEC sp_who active? --看哪個引起的阻塞，blk

INSERT INTO #Lock

??? EXEC sp_lock? --看鎖住了那個資源id，objid

?

DECLARE @DBName nvarchar(20);

SET @DBName='KF-BJAgencyAtt'

?

SELECT #Who.* FROM #Who WHERE dbname=@DBName

SELECT #Lock.* FROM #Lock

??? JOIN #Who

??????? ON #Who.spid=#Lock.spid

??????????? AND dbname=@DBName;

?

--最后發送到SQL Server的語句

DECLARE crsr Cursor FOR

??? SELECT blk FROM #Who WHERE dbname=@DBName AND blk<>0;

DECLARE @blk int;

open crsr;

FETCH NEXT FROM crsr INTO @blk;

WHILE (@@FETCH_STATUS = 0)

BEGIN

??? dbcc inputbuffer(@blk);

??? FETCH NEXT FROM crsr INTO @blk;

END

close crsr;

DEALLOCATE crsr;

?

--鎖定的資源

SELECT #Who.spid,hostname,objid,[type],mode,object_name(objid) as objName FROM #Lock

??? JOIN #Who

??????? ON #Who.spid=#Lock.spid

??????????? AND dbname=@DBName

??? WHERE objid<>0;

??? --SELECT * FROM?? #Lock

DROP Table #Who;

DROP Table #Lock;

查看死鎖實例

BEGIN tran
??????? UPDATE B SET age=age+1
??????? WaitFor Delay '00:00:05';
??????? SELECT * FROM A?????--執行完之后有結果

在新建一個查詢，執行下面sql語句

BEGIN tran
????????? UPDATE a SET dd=dd+1

????????? WaitFor Delay '00:00:05';
????????? SELECT * FROM B

????? ROLLBACK tran?? --當執行的時候會一直執行下去

查看出現死鎖語句

??
?

轉載于:https://www.cnblogs.com/starts/p/5311936.html

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