Top Waits by Object

SQL to Identify Objects Creating Cluster-wide bottlenecks (in the past 24 hours)
set linesize 140
set pagesize 50
col sample_time format a26
col event format a30
col object format a45
--col num_sql heading '# SQL' format 9,999
select
       ash.sql_id,
--       count(distinct ash.sql_id) Num_SQL,
       ash.event,
       ash.current_obj#,
       o.object_type,
       o.owner||'.'||o.object_name||'.'||o.subobject_name object,
       count(*)
  from gv$active_session_history ash,
       all_objects o
 where ash.current_obj# = o.object_id
   and ash.current_obj# != -1
   and ash.event is not null
   and ash.sample_time between  sysdate - 1 and sysdate
--   and ash.sample_time between  sysdate - 4 and sysdate - 3
--   and to_date ('24-SEP-2010 14:28:00','DD-MON-YYYY HH24:MI:SS') and to_date ('24-SEP-2010 14:29:59','DD-MON-YYYY HH24:MI:SS')
 group by
       ash.sql_id,
       ash.event,
       ash.current_obj#,
       o.object_type,
       o.owner||'.'||o.object_name||'.'||o.subobject_name
having count(*) > 20
 order by count(*) desc
/
exit
/