如何检查表是否在sql server中被锁定

Question

我有一个大型报告,我在sql server上运行.运行需要几分钟.我不希望用户点击两次运行.由于我在事务中包装整个过程,如何检查表是否被事务锁定？如果是这样,我想返回一条错误消息,说"生成报告,请在几分钟后重试".

如何实现这一目标？

Answer 1

您可以使用sys.dm_tran_locks视图,该视图返回有关当前活动的锁管理器资源的信息.

试试这个

 SELECT 
     SessionID = s.Session_id,
     resource_type,   
     DatabaseName = DB_NAME(resource_database_id),
     request_mode,
     request_type,
     login_time,
     host_name,
     program_name,
     client_interface_name,
     login_name,
     nt_domain,
     nt_user_name,
     s.status,
     last_request_start_time,
     last_request_end_time,
     s.logical_reads,
     s.reads,
     request_status,
     request_owner_type,
     objectid,
     dbid,
     a.number,
     a.encrypted ,
     a.blocking_session_id,
     a.text       
 FROM   
     sys.dm_tran_locks l
     JOIN sys.dm_exec_sessions s ON l.request_session_id = s.session_id
     LEFT JOIN   
     (
         SELECT  *
         FROM    sys.dm_exec_requests r
         CROSS APPLY sys.dm_exec_sql_text(sql_handle)
     ) a ON s.session_id = a.session_id
 WHERE  
     s.session_id > 50

Answer 2

更好的是,考虑sp_getapplock哪个是为此而设计的.或者使用SET LOCK_TIMEOUT

否则,你必须做一些sys.dm_tran_locks我只用于DBA的东西:不是用户定义的并发.

Answer 3

如果要验证是否在表上应用了锁定,请尝试以下查询.

SELECT resource_type, resource_associated_entity_id,
    request_status, request_mode,request_session_id,
    resource_description, o.object_id, o.name, o.type_desc 
FROM sys.dm_tran_locks l, sys.objects o
WHERE l.resource_associated_entity_id = o.object_id
    and resource_database_id = DB_ID()

Answer 4

sys.dm_tran_locks 包含会话的锁定信息

如果你想知道某个特定的表是否被锁定，可以使用以下查询

SELECT 
 * 
from 
 sys.dm_tran_locks 
where 
  resource_associated_entity_id = object_id('schemaname.tablename')

如果您有兴趣查找用户的登录名和正在运行的查询

SELECT
 DB_NAME(resource_database_id)
 , s.original_login_name
 , s.status
 , s.program_name
 , s.host_name
 , (select text from sys.dm_exec_sql_text(exrequests.sql_handle))
 ,*
from
  sys.dm_tran_locks dbl
     JOIN sys.dm_exec_sessions s ON dbl.request_session_id = s.session_id
  INNER JOIN  sys.dm_exec_requests exrequests on dbl.request_session_id = exrequests.session_id
where
 DB_NAME(dbl.resource_database_id) = 'dbname'

更多信息锁定查询

有关sys.dm_tran_locks的更多信息