VJOracle/Wait_Event_analysis.txt at master · subratcall/VJOracle · GitHub

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--Waits by the hour of the day
set pages 999
set lines 80

break on snap_time skip 2

col snap_time     heading 'Snap|Time'   format a20
col file_name     heading 'File|Name'   format a40
col object_type   heading 'Object|Type' format a10
col object_name   heading 'Object|Name' format a20
col wait_count    heading 'Wait|Count'  format 999,999
col time          heading 'Time'        format 999,999

select
   to_char(begin_interval_time,'yyyy-mm-dd hh24:mi') snap_time,
--   file_name,
   object_type,
   object_name,
   wait_count,
   time
from
   dba_hist_waitstat          wait,
   dba_hist_snapshot            snap,
   dba_hist_active_sess_history   ash,
   dba_data_files              df,
   dba_objects                  obj
where
   wait.snap_id = snap.snap_id
and
   wait.snap_id = ash.snap_id
and
   df.file_id = ash.current_file#
and
   obj.object_id = ash.current_obj#
and
   wait_count > 50
order by
   to_char(begin_interval_time,'yyyy-mm-dd hh24:mi'),
   file_name
;

--sessions have to wait for resources that decrease response time
select
   TO_CHAR(h.sample_time,'HH24') "Hour",
   Sum(h.wait_time/100)          "Total Wait Time (Sec)"
from
   v$active_session_history      h,
   v$event_name                 n
where
   h.session_state   = 'ON CPU'
and
   h.session_type = 'FOREGROUND'
and
   h.event_id = n.EVENT_ID
and
   n.wait_class <> 'Idle'
group by
   TO_CHAR(h.sample_time,'HH24');


   select
   TO_CHAR(h.sample_time,'Day') "Hour",
   sum(h.wait_time/100) "Total Wait Time (Sec)"
from
   v$active_session_history      h,
   v$event_name                  n
where
   h.session_state   = 'ON CPU'
and
   h.session_type = 'FOREGROUND'
and
   h.event_id = n.EVENT_ID
and
   n.wait_class <> 'Idle'
group by
   TO_CHAR(h.sample_time,'Day');


--total wait times by the day of the week
select
   TO_CHAR(h.sample_time,'Day') "Hour",
   sum(h.wait_time/100) "Total Wait Time (Sec)"
from
   v$active_session_history      h,
   v$event_name                  n
where
   h.session_state   = 'ON CPU'
and
   h.session_type = 'FOREGROUND'
and
   h.event_id = n.EVENT_ID
and
   n.wait_class <> 'Idle'
group by
   TO_CHAR(h.sample_time,'Day');


--   wait events that had high wait time from 12AM to 1PM
select
   h.event              "Wait Event",
   SUM(h.wait_time/100) "Wait Time (Sec)"
from
   v$active_session_history       h,
   v$event_name                 n
where
   h.session_state   = 'ON CPU'
and
   h.session_type = 'FOREGROUND'
and
   h.event_id = n.EVENT_ID
and
   to_char(h.sample_time,'HH24') = '12'
and
   n.wait_class <> 'Idle'
group by
   h.event
order by
  2 DESC;