SQL Server find out what is blocking what, or find a dead lock

Use this query, but you must be serveradmin to run it:

SELECT  db.name DBName,
  tl.request_session_id,
  wt.blocking_session_id,
  OBJECT_NAME(p.OBJECT_ID) BlockedObjectName,
  tl.resource_type,
  h1.TEXT AS RequestingText,
  h2.TEXT AS BlockingTest,
  tl.request_mode
FROM sys.dm_tran_locks AS tl
  INNER JOIN sys.databases db ON db.database_id = tl.resource_database_id
  INNER JOIN sys.dm_os_waiting_tasks AS wt ON tl.lock_owner_address = wt.resource_address
  INNER JOIN sys.partitions AS p ON p.hobt_id = tl.resource_associated_entity_id
  INNER JOIN sys.dm_exec_connections ec1 ON ec1.session_id = tl.request_session_id
  INNER JOIN sys.dm_exec_connections ec2 ON ec2.session_id = wt.blocking_session_id
  CROSS APPLY sys.dm_exec_sql_text(ec1.most_recent_sql_handle) AS h1
  CROSS APPLY sys.dm_exec_sql_text(ec2.most_recent_sql_handle) AS h2;