SQL DBA - Look at current expensive or blocked requests

SELECT r.session_id ,

r.[status] ,

r.wait_type ,

r.scheduler_id ,

SUBSTRING(qt.[text], r.statement_start_offset / 2,

( CASE WHEN r.statement_end_offset = -1

THEN LEN(CONVERT(NVARCHAR(MAX), qt.[text])) * 2

ELSE r.statement_end_offset

END - r.statement_start_offset ) / 2) AS [statement_executing] ,

DB_NAME(qt.[dbid]) AS [DatabaseName] ,

OBJECT_NAME(qt.objectid) AS [ObjectName] ,

r.cpu_time ,

r.total_elapsed_time ,

r.reads ,

r.writes ,

r.logical_reads ,

r.plan_handle

FROM sys.dm_exec_requests AS r

CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS qt

WHERE r.session_id > 50

ORDER BY r.scheduler_id ,

r.[status] ,

r.session_id ;