BI SQL # 167 : SQL Server DBA Scripts : List all Locks of the Current Database

Hi Folks,

In this article we are going to cover How to List all Locks of the Current Database.

In this post we are going to discuss following points:

• Problem Statement of SQL Script:
• Description of SQL Script:
• SQL Script Output Column
• SQL Script Code
• User Level to execute

Problem Statement of SQL Script:

Find List of all Locks of the Current Database.

Description of SQL Script:

This Transact-SQL script list all locks with details currently existing in the selected database. With this script you can check exclusive locked object watching lock escalation during long running DML statements, e.g. from key to page to object lock watch what happens when you run a DBCC command like Index Defrag or Shrink Database which index is used to validate a (foreign key) constraint.

SQL Script Output Column

SQL Script Code

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;

User Level to execute

200

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