sqlserver檢測死鎖

 

--檢測死鎖

--如果發生死鎖了，我們怎么去檢測具體發生死鎖的是哪條SQL語句或存儲過程？

--這時我們可以使用以下存儲過程來檢測，就可以查出引起死鎖的進程和SQL語句。SQL Server自帶的系統存儲過程sp_who和sp_lock也可以用來查找阻塞和死鎖, 但沒有這里介紹的方法好用。


 

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 
  
-- 找到臨時表的記錄數
 select  @intCountProperties = Count(*),@intCounter = 1
 from #tmp_lock_who
 
 IF @@ERROR<>0 RETURN @@ERROR 
 
 if @intCountProperties=0
  select '現在沒有阻塞和死鎖信息' as message

-- 循環開始
while @intCounter <= @intCountProperties
begin
-- 取第一條記錄
  select  @spid = spid,@bl = bl
  from #tmp_lock_who where Id = @intCounter 
 begin
  if @spid =0 
            select '引起數據庫死鎖的是: '+ CAST(@bl AS VARCHAR(10)) + '進程號,其執行的SQL語法如下'
 else
            select '進程號SPID：'+ CAST(@spid AS VARCHAR(10))+ '被' + '進程號SPID：'+ CAST(@bl AS VARCHAR(10)) +'阻塞,其當前進程執行的SQL語法如下'
 DBCC INPUTBUFFER (@bl )
 end 

-- 循環指針下移
 set @intCounter = @intCounter + 1
end

drop table #tmp_lock_who

return 0
end


 

--殺死鎖和進程

--如何去手動的殺死進程和鎖？最簡單的辦法，重新啟動服務。但是這里要介紹一個存儲過程，通過顯式的調用，可以殺死進程和鎖。

use master
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

--用法  
exec p_killspid  'newdbpy'


 

--查看鎖信息

--如何查看系統中所有鎖的詳細信息？在企業管理管理器中，我們可以看到一些進程和鎖的信息，這里介紹另外一種方法。

--查看鎖信息
create table #t(req_spid int,obj_name sysname)

declare @s nvarchar(4000)
    ,@rid int,@dbname sysname,@id int,@objname sysname

declare tb cursor for 
    select distinct req_spid,dbname=db_name(rsc_dbid),rsc_objid
    from master..syslockinfo where rsc_type in(4,5)
open tb
fetch next from tb into @rid,@dbname,@id
while @@fetch_status=0
begin
    set @s='select @objname=name from ['+@dbname+']..sysobjects where id=@id'
    exec sp_executesql @s,N'@objname sysname out,@id int',@objname out,@id
    insert into #t values(@rid,@objname)
    fetch next from tb into @rid,@dbname,@id
end
close tb
deallocate tb

select 進程id=a.req_spid
    ,數據庫=db_name(rsc_dbid)
    ,類型=case rsc_type when 1 then 'NULL 資源（未使用）'
        when 2 then '數據庫'
        when 3 then '文件'
        when 4 then '索引'
        when 5 then '表'
        when 6 then '頁'
        when 7 then '鍵'
        when 8 then '擴展盤區'
        when 9 then 'RID（行 ID)'
        when 10 then '應用程序'
    end
    ,對象id=rsc_objid
    ,對象名=b.obj_name
    ,rsc_indid
 from master..syslockinfo a left join #t b on a.req_spid=b.req_spid

go
drop table #t