/*
   ASH graph from v$active_session_history no filter by DBID nor time 
   don't use dba_hist_active_sess_history ,


   Output looks like

   TO_CHAR( AAS PCT1 FIRST           PCT2 SECOND          GRAPH
   -------- --- ---- --------------- ---- --------------- -------------------------------------------
   15 15:00   7   46 db file sequent   19 CPU             +++++++ooooooooooooo4ooooooooooo------
   15 16:00   6   53 db file sequent   31 CPU             +++++++++ooooooooooo4oooooooo---
   15 17:00   7   48 db file sequent   41 CPU             +++++++++++++++ooooo4oooooooooooooooo-
   15 18:00   5   55 CPU               37 db file sequent ++++++++++++++oooooo4oooooo-
   15 19:00   1   64 CPU               21 db file sequent ++o                 4
   15 20:00   1   63 CPU               19 read by other s ++++o-              4
   15 21:00   2   31 db file sequent   24 CPU             ++ooo----           4
   15 22:00   3   35 CPU               24 db file scatter +++++ooooooo---     4
   15 23:00   6   29 log file sync     25 db file sequent ++++ooooooooo-------4-------------
   16 00:00   7   52 db file sequent   27 CPU             ++++++++++oooooooooo4ooooooooooooooo--
   16 01:00   4   57 CPU               36 db file sequent +++++++++++oooooooo 4
   16 02:00   6   38 db file sequent   21 CPU             ++++++oooooooooooo--4---------
   16 03:00   3   69 db file sequent   20 CPU             +++ooooooooooo      4
   16 04:00   0   45 db file sequent   28 CPU             o                   4
   16 05:00   1   58 db file sequent   24 CPU             +ooo                4
   16 06:00   1   41 db file sequent   39 CPU             +oo                 4


    The "graph" on the right shows the load over time each line is an hour by default. 
    The "+" represent CPU, "o" represent I/O and "-" represent a wait.
    The columns "FIRST" and "SECOND" represent the top two things happening on the database. 

*/


Def v_secs=3600 --  bucket size
Def v_days=1 --  total time analyze
Def v_bars=5 -- size of one AAS in characters
Def v_graph=80

col aveact format 999.99
col graph format a30
col fpct format 9.99
col spct format 9.99
col tpct format 9.99
col aas1 format 9.99
col aas2 format 9.99


select to_char(start_time,'DD HH24:MI:SS'),
       samples,
       --total,
       --waits,
       --cpu,
       round(fpct * (total/&v_secs),2) aas1,
       decode(fpct,null,null,first) first,
       round(spct * (total/&v_secs),2) aas2,
       decode(spct,null,null,second) second,
        substr(substr(rpad('+',round((cpu*&v_bars)/&v_secs),'+') ||
        rpad('-',round((waits*&v_bars)/&v_secs),'-')  ||
        rpad(' ',p.value * &v_bars,' '),0,(p.value * &v_bars)) ||
        p.value  ||
        substr(rpad('+',round((cpu*&v_bars)/&v_secs),'+') ||
        rpad('-',round((waits*&v_bars)/&v_secs),'-')  ||
        rpad(' ',p.value * &v_bars,' '),(p.value * &v_bars),10) ,0,30)
        graph
     --  spct,
     --  decode(spct,null,null,second) second,
     --  tpct,
     --  decode(tpct,null,null,third) third
from (
select start_time
     , max(samples) samples
     , sum(top.total) total
     , round(max(decode(top.seq,1,pct,null)),2) fpct
     , substr(max(decode(top.seq,1,decode(top.event,'ON CPU','CPU',event),null)),0,15) first
     , round(max(decode(top.seq,2,pct,null)),2) spct
     , substr(max(decode(top.seq,2,decode(top.event,'ON CPU','CPU',event),null)),0,15) second
     , round(max(decode(top.seq,3,pct,null)),2) tpct
     , substr(max(decode(top.seq,3,decode(top.event,'ON CPU','CPU',event),null)),0,10) third
     , sum(waits) waits
     , sum(cpu) cpu
from (
  select
       to_date(tday||' '||tmod*&v_secs,'YYMMDD SSSSS') start_time
     , event
     , total
     , row_number() over ( partition by id order by total desc ) seq
     , ratio_to_report( sum(total)) over ( partition by id ) pct
     , max(samples) samples
     , sum(decode(event,'ON CPU',total,0))    cpu
     , sum(decode(event,'ON CPU',0,total))    waits
  from (
   select
         to_char(sample_time,'YYMMDD')                      tday
       , trunc(to_char(sample_time,'SSSSS')/&v_secs)          tmod
       , to_char(sample_time,'YYMMDD')||trunc(to_char(sample_time,'SSSSS')/&v_secs) id
       , decode(ash.session_state,'ON CPU','ON CPU',ash.event)     event
       , sum(decode(session_state,'ON CPU',1,decode(session_type,'BACKGROUND',0,1))) total
       , (max(sample_id)-min(sample_id)+1)                    samples
     from
        v$active_session_history ash
     group by  trunc(to_char(sample_time,'SSSSS')/&v_secs)
            ,  to_char(sample_time,'YYMMDD')
            ,  decode(ash.session_state,'ON CPU','ON CPU',ash.event)
  )  chunks
  group by id, tday, tmod, event, total
) top
group by start_time
) aveact,
  v$parameter p
where p.name='cpu_count'
order by start_time
/