SQL 2005 System Objects for getting information about Transaction Locks

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SQL 2005 System Objects for getting information about Transaction Locks

sys.dm_tran_locks:
Shows us all locks held on all resources for all transaction. We start from this view since we want to get information about locked resources.
sys.partitions:
Contains information about partitions in the database. We can join it to the sys.dm_tran_locks on the hobt_id only for resource_type values ‘HOBT’, ‘Page’, ‘RID’  and ‘Key’. With this join we get the object_id of our locked table.
sys.objects:
Contains data for all schema scoped database objects. We join it to sys.partitions to get the Name of the locked object which is usually a table name.
sys.dm_exec_sessions:
Shows data about all active sessions on SQL server. We join it to sys.dm_tran_locks to get user login information for each held lock.
sys.dm_tran_session_transactions:
Shows data for all transactions for a session. By joining in to sys.dm_exec_sessions we get a link to all active transactions in the session.
sys.dm_tran_active_transactions:
Shows data for all active transactions in SQL Server. By joining it to sys.dm_tran_session_transactions we only get information for the session we want.
sys.dm_exec_connections:
Shows data for all connections in SQL Server. By joining it to sys.dm_exec_sessions we get connection info for our session.
sys.dm_exec_sql_text:
Returns SQL statement that is associated with the SQL handle input parameter. By cross applying it to the sys.dm_exec_connections we get the last executed statement for the connection, which in our case is the statement that is holding locks.

01.SELECT L.request_session_id AS SPID,
02. DB_NAME(L.resource_database_id) AS DatabaseName,
03. O.Name AS LockedObjectName,
04. P.object_id AS LockedObjectId,
05. L.resource_type AS LockedResource,
06. L.request_mode AS LockType,
07. ST.text AS SqlStatementText,
08. ES.login_name AS LoginName,
09. ES.host_name AS HostName,
10. TST.is_user_transaction as IsUserTransaction,
11. AT.name as TransactionName,
12. CN.auth_scheme as AuthenticationMethod
13.FROM sys.dm_tran_locks L
14. JOIN sys.partitions P ON P.hobt_id = L.resource_associated_entity_id
15. JOIN sys.objects O ON O.object_id = P.object_id
16. JOIN sys.dm_exec_sessions ES ON ES.session_id = L.request_session_id
17. JOIN sys.dm_tran_session_transactions TST ON ES.session_id = TST.session_id
18. JOIN sys.dm_tran_active_transactions AT ON TST.transaction_id = AT.transaction_id
19. JOIN sys.dm_exec_connections CN ON CN.session_id = ES.session_id
20. CROSS APPLY sys.dm_exec_sql_text(CN.most_recent_sql_handle) AS ST
21.WHERE resource_database_id = db_id()
22. ORDER BY L.request_session_id

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