@plusenv

column event format a25 trunc

column program format a10

column module format a20 trunc

column object_name format a30

column ms format 999

column sql_text format a60

column lock_type format a4

column pct format 99.9

WITH ash_query AS (

SELECT event

,program

,h.module

,h.action

,object_name

,SUM(time_waited)/1000 ms

,COUNT( * ) waits

,sql_text

,RANK() OVER (ORDER BY SUM(time_waited) DESC) AS time_rank

,ROUND(SUM(time_waited) * 100 / SUM(SUM(time_waited)) OVER (), 2) pct

FROM v$active_session_history h

,dba_objects o

,v$sql s

WHERE h.event LIKE '%latch%'

or h.event like '%mutex%'

and h.current_obj# = o.object_id

and h.sql_id = s.sql_id

GROUP BY event

,program

,h.module

,h.action

,object_name

,sql_text

)

SELECT event,module, object_name, ms,pct,

sql_text

FROM ash_query

WHERE time_rank <= 10

ORDER BY time_rank;