Question

当我们遇到性能问题时，我正在使用sys.dm_tran_locks视图来检查数据库的哪些区域有锁定。

使用此视图....

如果resource_type是数据库，我可以使用DB_NAME函数找出具有锁定的数据库。
如果是对象，我通常可以加入sys.tables来检查它是什么表。

但是，如果resource_type是页面或键，有没有办法将其追溯到其父表，以便我可以很好地了解哪些表是锁定的？

Answer 1

这是（Example query）resource_associated_entity_id列的内容。

SELECT dm_tran_locks.request_session_id,
       dm_tran_locks.resource_database_id,
       DB_NAME(dm_tran_locks.resource_database_id) AS dbname,
       CASE
           WHEN resource_type = 'OBJECT'
               THEN OBJECT_NAME(dm_tran_locks.resource_associated_entity_id)
           ELSE OBJECT_NAME(partitions.OBJECT_ID)
       END AS ObjectName,
       partitions.index_id,
       indexes.name AS index_name,
       dm_tran_locks.resource_type,
       dm_tran_locks.resource_description,
       dm_tran_locks.resource_associated_entity_id,
       dm_tran_locks.request_mode,
       dm_tran_locks.request_status
FROM sys.dm_tran_locks
LEFT JOIN sys.partitions ON partitions.hobt_id = dm_tran_locks.resource_associated_entity_id
LEFT JOIN sys.indexes ON indexes.OBJECT_ID = partitions.OBJECT_ID AND indexes.index_id = partitions.index_id
WHERE resource_associated_entity_id > 0
  AND resource_database_id = DB_ID()
ORDER BY request_session_id, resource_associated_entity_id

Answer 2

您必须找到与该资源关联的object_id，并且可能涉及加入另一个表。例如，

SELECT *, OBJECT_NAME(p.object_id) 
FROM sys.dm_tran_locks l    
JOIN sys.partitions p 
ON l.resource_associated_entity_id = p.hobt_id 
WHERE resource_type = 'KEY'

在联机丛书中查找sys.dm_tran_locks，以确定每个资源的连接表应该是什么。

如何找出页锁所属的表

2 个答案: