SQL Server – Monitor Blocking

Here’s how to write blocking messages out to the SQL Errorlog. It won’t look pretty but has everything you should need.

/*
Set up a trace to monitor blocking on a server.

*/

-- Trace locks into the Errolog file
DBCC TRACEON(1222, -1);
-- Check the status
DBCC TRACESTATUS (1222, -1)
-- and turn it off
DBCC TRACEOFF (1222,-1)

Here is a link which tells how to set up the SQL Profiler to monitor deadlocks using a Deadlock Graph. Choose “Save Deadlock XML Separately” in the new tab and “Each deadlock XML graph in a distinct file” as options and give it a path and filename. This way you can capture and read each lock easily, later.

Find any current locking … blocking for a particular database. I haven’t tried this.

/*

http://stackoverflow.com/questions/12422986/sql-query-to-get-the-deadlocks-in-sql-server-2008

*/

SELECT L.request_session_id AS SPID,
 DB_NAME(L.resource_database_id) AS DatabaseName,
 O.Name AS LockedObjectName,
 P.object_id AS LockedObjectId,
 L.resource_type AS LockedResource,
 L.request_mode AS LockType,
 ST.text AS SqlStatementText,
 ES.login_name AS LoginName,
 ES.host_name AS HostName,
 TST.is_user_transaction AS IsUserTransaction,
 AT.name AS TransactionName,
 CN.auth_scheme AS AuthenticationMethod
FROM sys.dm_tran_locks L
JOIN sys.partitions P
ON P.hobt_id = L.resource_associated_entity_id
JOIN sys.objects O
ON O.object_id = P.object_id
JOIN sys.dm_exec_sessions ES
ON ES.session_id = L.request_session_id
JOIN sys.dm_tran_session_transactions TST
ON ES.session_id = TST.session_id
JOIN sys.dm_tran_active_transactions AT
ON TST.transaction_id = AT.transaction_id
JOIN sys.dm_exec_connections CN
ON CN.session_id = ES.session_id
CROSS APPLY sys.dm_exec_sql_text(CN.most_recent_sql_handle) AS ST
WHERE resource_database_id = DB_ID()
ORDER BY L.request_session_id