Generate AWR report during peak CPU usage time

Question: I want to generate an AWR report during the period of peak CPU usage.  How can I have a script to generate an AWR report during periods of peak CPU usage.

Answer:  The following script will find the period of peak CPU usage and generate the syntax to create an AWR report for that snapshot period.

ading off
set feedback off
spool runme.sql

select 'spool awr_rpt.txt' from dual;

with
 sum_awr 
as 
(
select 
   snapshot                                            c1,
   to_char(snaptime, 'yyyy-mm-dd hh24')                c2, 
   to_number(round(busydelta / (busydelta + idledelta) * 100, 2)) c3
from (
   select 
      s.snap_id snapshot,
      s.begin_interval_time snaptime,
      os1.value - lag(os1.value) over (order by s.snap_id) busydelta,
      os2.value - lag(os2.value) over (order by s.snap_id) idledelta
   from 
  See code depot for full script 
      dba_hist_snapshot s, 
      dba_hist_osstat os1, 
      dba_hist_osstat os2
   where
      s.snap_id = os1.snap_id 
   and 
      s.snap_id = os2.snap_id
   and 
      s.instance_number = os1.instance_number 
   and 
      s.instance_number = os2.instance_number
   and 
      s.dbid = os1.dbid and s.dbid = os2.dbid
   and 
      s.instance_number = (select instance_number from v$instance)
   and 
      s.dbid = (select dbid from v$database)
   and 
      os1.stat_name = 'BUSY_TIME'
   and 
      os2.stat_name = 'IDLE_TIME'
)),
dbid
as
See code depot for full script 
   (select dbid my_id from v$database)
select 
   'SELECT output FROM TABLE'
   ||' (dbms_workload_repository.awr_report_text ('
   ||my_id||',1,'||c1||','||to_number(c1+1)||'));'
from 
   sum_awr,
   dbid
where
  c3 = (select max(c3) from sum_awr)
;

select 'spool off' from dual;

spool off

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