SQL Server锁定罪魁祸首查询？

Question

我从http://sqlserverdb.blogspot.com/2011/06/find-all-system-and-user-defined-error.html找到了这个:

SELECT
    t.resource_type,
    t.resource_database_id,
    t.resource_associated_entity_id,
    t.request_mode,
    t.request_session_id,
    w.blocking_session_id
    FROM sys.dm_tran_locks as t
    INNER JOIN sys.dm_os_waiting_tasks AS w
    ON t.lock_owner_address =w.resource_address

从那里我试图推导出来自w.blocking_session_id的实际SQL语句,但我似乎无法找到合适的位.有谁能指出我的线索？

我在一个SSMS(SQL2008)查询窗口中使用它:

begin transaction
update MyTable with (tablockx)
set MyTableColumn = MyTableColumn
where 1 = 0

在另一个新窗口中我执行了这个:

select * from MyTable

并且SSMS显示它"等待"永远执行查询,因此它是块受害者.但我想知道问题代码实际上是谁.

谢谢.

Answer 1

根据您提供的示例查询,以下完整示例显示了使用sys.dm_os_waiting_tasksDMV而不是DMV 的阻塞SQL sys.dm_tran_locks:

SELECT DISTINCT
  TheBlockingSQL.text AS [The blocking SQL]
FROM sys.dm_exec_connections AS Conns
  INNER JOIN sys.dm_exec_requests AS BlockedReqs
ON Conns.session_id = BlockedReqs.blocking_session_id
  INNER JOIN sys.dm_os_waiting_tasks AS w
ON BlockedReqs.session_id = w.session_id
  CROSS APPLY sys.dm_exec_sql_text(Conns.most_recent_sql_handle) AS TheBlockingSQL

这是输出的屏幕截图: