--запросы, страдающие от блокировки
SELECT TOP 10
       [Average Time Blocked] = (total_elapsed_time - total_worker_time) / qs.execution_count,
       [Total Time Blocked] = total_elapsed_time - total_worker_time,
       [Execution count] = qs.execution_count,
       [Individual Query] = SUBSTRING (qt.text,qs.statement_start_offset/2, 
         (CASE
            WHEN qs.statement_end_offset = -1 THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 
            ELSE qs.statement_end_offset
          END - qs.statement_start_offset)/2),
       [Parent Query] = qt.text,
       [DatabaseName] = DB_NAME(qt.dbid)
  FROM sys.dm_exec_query_stats qs
  CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
  ORDER BY [Average Time Blocked] DESC;