如何检查表上持有哪些锁

Question

我们如何检查查询批次对哪些行应用了哪些数据库锁？

任何工具可以实时突出表行级锁定？

数据库：SQL Server 2005

Answer 1

您可以通过运行以下命令找到阻塞 sql 和等待 sql：

SELECT
    t1.resource_type ,
    DB_NAME( resource_database_id) AS dat_name ,
    t1.resource_associated_entity_id,
    t1.request_mode,
    t1.request_session_id,
    t2.wait_duration_ms,
    ( SELECT TEXT FROM sys.dm_exec_requests r CROSS apply sys.dm_exec_sql_text ( r.sql_handle ) WHERE r.session_id = t1.request_session_id ) AS wait_sql,
    t2.blocking_session_id,
    ( SELECT TEXT FROM sys.sysprocesses p CROSS apply sys.dm_exec_sql_text ( p.sql_handle ) WHERE p.spid = t2.blocking_session_id ) AS blocking_sql 
FROM
    sys.dm_tran_locks t1,
    sys.dm_os_waiting_tasks t2 
WHERE
    t1.lock_owner_address = t2.resource_address

Answer 2

您可以通过以下脚本找到详细信息。

-- List all Locks of the Current Database 
SELECT TL.resource_type AS ResType 
      ,TL.resource_description AS ResDescr 
      ,TL.request_mode AS ReqMode 
      ,TL.request_type AS ReqType 
      ,TL.request_status AS ReqStatus 
      ,TL.request_owner_type AS ReqOwnerType 
      ,TAT.[name] AS TransName 
      ,TAT.transaction_begin_time AS TransBegin 
      ,DATEDIFF(ss, TAT.transaction_begin_time, GETDATE()) AS TransDura 
      ,ES.session_id AS S_Id 
      ,ES.login_name AS LoginName 
      ,COALESCE(OBJ.name, PAROBJ.name) AS ObjectName 
      ,PARIDX.name AS IndexName 
      ,ES.host_name AS HostName 
      ,ES.program_name AS ProgramName 
FROM sys.dm_tran_locks AS TL 
     INNER JOIN sys.dm_exec_sessions AS ES 
         ON TL.request_session_id = ES.session_id 
     LEFT JOIN sys.dm_tran_active_transactions AS TAT 
         ON TL.request_owner_id = TAT.transaction_id 
            AND TL.request_owner_type = 'TRANSACTION' 
     LEFT JOIN sys.objects AS OBJ 
         ON TL.resource_associated_entity_id = OBJ.object_id 
            AND TL.resource_type = 'OBJECT' 
     LEFT JOIN sys.partitions AS PAR 
         ON TL.resource_associated_entity_id = PAR.hobt_id 
            AND TL.resource_type IN ('PAGE', 'KEY', 'RID', 'HOBT') 
     LEFT JOIN sys.objects AS PAROBJ 
         ON PAR.object_id = PAROBJ.object_id 
     LEFT JOIN sys.indexes AS PARIDX 
         ON PAR.object_id = PARIDX.object_id 
            AND PAR.index_id = PARIDX.index_id 
WHERE TL.resource_database_id  = DB_ID() 
      AND ES.session_id <> @@Spid -- Exclude "my" session 
      -- optional filter  
      AND TL.request_mode <> 'S' -- Exclude simple shared locks 
ORDER BY TL.resource_type 
        ,TL.request_mode 
        ,TL.request_type 
        ,TL.request_status 
        ,ObjectName 
        ,ES.login_name;



--TSQL commands
SELECT 
       db_name(rsc_dbid) AS 'DATABASE_NAME',
       case rsc_type when 1 then 'null'
                             when 2 then 'DATABASE' 
                             WHEN 3 THEN 'FILE'
                             WHEN 4 THEN 'INDEX'
                             WHEN 5 THEN 'TABLE'
                             WHEN 6 THEN 'PAGE'
                             WHEN 7 THEN 'KEY'
                             WHEN 8 THEN 'EXTEND'
                             WHEN 9 THEN 'RID ( ROW ID)'
                             WHEN 10 THEN 'APPLICATION' end  AS 'REQUEST_TYPE',

       CASE req_ownertype WHEN 1 THEN 'TRANSACTION'
                                     WHEN 2 THEN 'CURSOR'
                                     WHEN 3 THEN 'SESSION'
                                     WHEN 4 THEN 'ExSESSION' END AS 'REQUEST_OWNERTYPE',

       OBJECT_NAME(rsc_objid ,rsc_dbid) AS 'OBJECT_NAME', 
       PROCESS.HOSTNAME , 
       PROCESS.program_name , 
       PROCESS.nt_domain , 
       PROCESS.nt_username , 
       PROCESS.program_name ,
       SQLTEXT.text 
FROM sys.syslockinfo LOCK JOIN 
     sys.sysprocesses PROCESS
  ON LOCK.req_spid = PROCESS.spid
CROSS APPLY sys.dm_exec_sql_text(PROCESS.SQL_HANDLE) SQLTEXT
where 1=1
and db_name(rsc_dbid) = db_name()



--Lock on a specific object
SELECT * 
FROM sys.dm_tran_locks
WHERE resource_database_id = DB_ID()
AND resource_associated_entity_id = object_id('Specific Table');

Answer 3

我使用动态管理视图 (DMV) 来捕获锁以及被锁定项目的 object_id 或 partition_id。

（必须切换到要观察的数据库才能获取 object_id）

SELECT 
     TL.resource_type,
     TL.resource_database_id,
     TL.resource_associated_entity_id,
     TL.request_mode,
     TL.request_session_id,
     WT.blocking_session_id,
     O.name AS [object name],
     O.type_desc AS [object descr],
     P.partition_id AS [partition id],
     P.rows AS [partition/page rows],
     AU.type_desc AS [index descr],
     AU.container_id AS [index/page container_id]
FROM sys.dm_tran_locks AS TL
INNER JOIN sys.dm_os_waiting_tasks AS WT 
 ON TL.lock_owner_address = WT.resource_address
LEFT OUTER JOIN sys.objects AS O 
 ON O.object_id = TL.resource_associated_entity_id
LEFT OUTER JOIN sys.partitions AS P 
 ON P.hobt_id = TL.resource_associated_entity_id
LEFT OUTER JOIN sys.allocation_units AS AU 
 ON AU.allocation_unit_id = TL.resource_associated_entity_id;

Answer 4

您可以通过以下查询找到当前表上的锁。

USE yourdatabase;
GO

SELECT * FROM sys.dm_tran_locks
  WHERE resource_database_id = DB_ID()
  AND resource_associated_entity_id = OBJECT_ID(N'dbo.yourtablename');

见sys.dm_tran_locks

如果存在相同request_owner_type的多个实例，则使用request_owner_id列来区分每个实例。对于分布式事务，request_owner_type 和 request_owner_guid 列将显示不同的实体信息。

例如，会话 S1 拥有 Table1 上的共享锁；在会话 S1 下运行的事务 T1 也拥有 Table1 上的共享锁。在这种情况下，sys.dm_tran_locks 返回的 resource_description 列将显示同一资源的两个实例。 request_owner_type 列将一个实例显示为会话，另一个实例显示为事务。此外，resource_owner_id 列将具有不同的值。

Answer 5

这并不能准确地向您显示哪些行被锁定，但这可能对您有所帮助。

您可以通过运行以下命令检查哪些语句被阻止：

select cmd,* from sys.sysprocesses
where blocked > 0

它还会告诉您每个块正在等待什么。所以你可以一直追踪，看看哪个语句导致了第一个块，然后导致了其他块。

编辑添加来自@MikeBlandford的评论：

blocked 列表示阻塞进程的 spid。你可以运行 kill {spid} 来修复它。

Answer 6

要添加到其他响应，sp_lock 也可用于转储所有正在运行的进程的完整锁定信息。输出可能是压倒性的，但如果您想确切地知道锁定了什么，运行它是很有价值的。我通常将它与sp_who2 一起使用，以快速解决锁定问题。

有多种不同版本的“更友好”sp_lock 过程在线可用，具体取决于相关 SQL Server 的版本。

在您的情况下，对于 SQL Server 2005，sp_lock 仍然可用，但已弃用，因此现在建议对此类事情使用 sys.dm_tran_locks 视图。您可以找到一个如何“滚动自己”的 sp_lock 函数 here 的示例。

Answer 7

您还可以使用内置的sp_who2 存储过程来获取 SQL Server 实例上的当前阻塞和阻塞进程。通常，您会在 SQL Profiler 实例旁边运行它以查找阻塞进程并查看 spid 在 profiler 中发出的最新命令。