sqlserver-查阻塞

模拟阻塞：

打开两个窗口：

    窗口一：

 BEGIN TRANSACTION--开始事务
 update tblUser set [Password] = '' where id = 1
 --等待1分钟
 WAITFOR DELAY '00:1'; 

　窗口二：

 select * from tblUser where id = 1

查询阻塞：（当前被阻塞的进程id，不一定是它阻塞其他进程，有可能是它被其他进程阻塞）

 select
     request_session_id spid,
     OBJECT_NAME(resource_associated_entity_id) tableName
 from
     sys.dm_tran_locks
 where
     resource_type='OBJECT'

查看阻塞的语句：（根据上面查询出来的阻塞进程id）

 DBCC INPUTBUFFER (54)

杀死死锁进程：（根据上面查询出来的阻塞进程id）

 kill 55

知识点：WAITFOR DELAY

    WAITFOR是SQL Server中Transact-SQL提供的一个流程控制语句。它的作用就是等待特定时间，然后继续执行后续的语句。它包含一个参数DELAY，用来指定等待的时间。

    WAITFOR DELAY '0:0:4'--  表示延迟4秒，再继续执行。

 

进化版一：

查阻塞进程，及是谁在阻塞，还有阻塞的表：

 select t1.spid as '等待的进程id',
     OBJECT_NAME(t2.resource_associated_entity_id) as '等待进程-表' ,
     t1.blocked as '阻塞的进程id',
     OBJECT_NAME(t3.resource_associated_entity_id) as '阻塞进程-表',
     tt1.hostname as '阻塞进程-hostname',
     tt1.nt_domain as '阻塞进程-nt_domain',
     tt1.nt_username as '阻塞进程-nt_username',
     tt1.loginame as '阻塞进程-loginame'
 from (
 select 0 as spid ,blocked
 from (
     select * from master..sysprocesses where blocked > 0
 ) a
 where not exists (
     select * from (select * from master..sysprocesses where blocked > 0 ) b
     where a.blocked=spid
 )
 union
 select spid,blocked from master..sysprocesses where blocked > 0
 ) t1
 inner join master..sysprocesses tt1 on t1.blocked = tt1.spid
 left join sys.dm_tran_locks t2 on t1.spid = t2.request_session_id and t2.resource_type = 'OBJECT'
 left join sys.dm_tran_locks t3 on t1.blocked = t3.request_session_id and t3.resource_type = 'OBJECT'

进化版二：（最实用，上面的精简版）

查阻塞数据库的进程id，把这些进程kill掉就可以了；

 select t1.blocked as '阻塞的进程id',
     OBJECT_NAME(t2.resource_associated_entity_id) as '阻塞的表',
     t3.hostname as '阻塞进程-hostname',
     t3.nt_domain as '阻塞进程-nt_domain',
     t3.nt_username as '阻塞进程-nt_username',
     t3.loginame as '阻塞进程-loginame'
 from master..sysprocesses t1
 inner join sys.dm_tran_locks t2 on t1.blocked = t2.request_session_id and t2.resource_type = 'OBJECT'
 inner join master..sysprocesses t3 on t1.blocked = t3.spid
 where t1.blocked > 0

进化版三：（信息最全）

查看等待的进程、阻塞的进程执行的语句，账号，地址等信息；

 SELECT
    WT.session_id AS '等待的进程',
    DB_NAME(TL.resource_database_id) AS '数据库名',
    (select OBJECT_NAME(resource_associated_entity_id) --resource_associated_entity_id为Bigint类型，而Object_Name方法参数为int，有可能出现转换失败的情况
    from sys.dm_tran_locks
    where request_session_id = WT.blocking_session_id
    and resource_type = 'OBJECT') as '表名',
    WT.wait_duration_ms,
    TL.request_mode,
    (SELECT SUBSTRING(ST.text, (ER.statement_start_offset/2) + 1,
       ((CASE ER.statement_end_offset
          WHEN -1 THEN DATALENGTH(ST.text)
          ELSE ER.statement_end_offset
         END - ER.statement_start_offset)/2) + 1)
    FROM sys.dm_exec_requests AS ER
       CROSS APPLY sys.dm_exec_sql_text(ER.sql_handle) AS ST
    WHERE ER.session_id = TL.request_session_id)
       AS '等待执行的sql',
    WT.blocking_session_id as '阻塞的进程',
    WT.resource_description AS blocking_resource_description,
    CASE WHEN WT.blocking_session_id > 0 THEN
       (SELECT ST2.text FROM sys.sysprocesses AS SP
              CROSS APPLY sys.dm_exec_sql_text(SP.sql_handle) AS ST2
       WHERE SP.spid = WT.blocking_session_id)
       ELSE NULL
    END AS '阻塞进程执行的sql',
     SPP.hostname as '阻塞进程-hostname',
     SPP.nt_domain as '阻塞进程-nt_domain',
     SPP.nt_username as '阻塞进程-nt_username',
     SPP.loginame as '阻塞进程-loginame'
 FROM sys.dm_os_waiting_tasks AS WT
    JOIN sys.dm_tran_locks AS TL
    ON WT.resource_address = TL.lock_owner_address
    inner join sys.sysprocesses as SPP on WT.blocking_session_id = SPP.spid
 WHERE WT.wait_duration_ms > 5000--等待5s以上的
    AND WT.session_id > 50;

进化版四：

    一、查看阻塞进程及语句：exec sp_who_lock（在master数据库下）
    二、解决阻塞：exec p_killspid 'DBName'（在master数据库下）

 

创建存储过程，查当前阻塞：

 USE [master]
 GO
 /****** Object:  StoredProcedure [dbo].[sp_who_lock]    Script Date: 2018/4/14 22:26:36 ******/
 SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFIER ON
 GO
 create 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 

创建存储过程，解除阻塞：

 USE [master]
 GO
 /****** Object:  StoredProcedure [dbo].[p_killspid]    Script Date: 2018/4/14 22:18:31 ******/
 SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFIER ON
 GO

 create proc [dbo].[p_killspid]
 @dbname varchar(200)    --要关闭进程的数据库名
 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) --杀所有当前阻塞在数据库中的进程
         select spid=cast(blocked as varchar(20)) from master..sysprocesses where dbid=db_id(@dbname) and blocked > 0 --只杀阻塞其他进程的进程
     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

参考：

https://blog.csdn.net/snowfoxmonitor/article/details/7182948

https://blog.csdn.net/wulex/article/details/61916478

https://blog.csdn.net/zouxistudent/article/details/7029759

https://blog.csdn.net/a237428367/article/details/9004802

https://www.cnblogs.com/fuyuanming/p/5783421.html