Thursday, February 20, 2014

AWR Top 5 Timed Foreground Events

I've noticed that people post how to get AWR Top 5 Timed Foreground Events other a range of snapshots using a SQL query from time to time. Since this is something I've done for years here is the version of the SQL I use in case somebody finds it useful:
select case wait_rank when 1 then inst_id end "Inst Num",
 case wait_rank when 1 then snap_id end "Snap Id",
 case wait_rank when 1 then begin_snap end "Begin Snap",
 case wait_rank when 1 then end_snap end "End Snap",
 event_name "Event",
 total_waits "Waits",
 time_waited "Time(s)",
 round((time_waited/total_waits)*1000) "Avg wait(ms)",
 round((time_waited/db_time)*100, 2) "% DB time",
 substr(wait_class, 1, 15) "Wait Class"
from (
select
  inst_id,
  snap_id, to_char(begin_snap, 'DD-MM-YY hh24:mi:ss') begin_snap,
  to_char(end_snap, 'hh24:mi:ss') end_snap,
  event_name,
  wait_class,
  total_waits,
  time_waited,
  dense_rank() over (partition by inst_id, snap_id order by time_waited desc)-1 wait_rank,
  max(time_waited) over (partition by inst_id, snap_id) db_time
from (
select
  s.instance_number inst_id,
  s.snap_id,
  s.begin_interval_time begin_snap,
  s.end_interval_time end_snap,
  event_name,
  wait_class,
  total_waits-lag(total_waits, 1, total_waits) over
   (partition by s.startup_time, s.instance_number, stats.event_name order by s.snap_id) total_waits,
  time_waited-lag(time_waited, 1, time_waited) over
   (partition by s.startup_time, s.instance_number, stats.event_name order by s.snap_id) time_waited,
  min(s.snap_id) over (partition by s.startup_time, s.instance_number, stats.event_name) min_snap_id
from (
 select dbid, instance_number, snap_id, event_name, wait_class, total_waits_fg total_waits, round(time_waited_micro_fg/1000000, 2) time_waited
  from dba_hist_system_event
  where wait_class not in ('Idle', 'System I/O')
 union all
 select dbid, instance_number, snap_id, stat_name event_name, null wait_class, null total_waits, round(value/1000000, 2) time_waited
  from dba_hist_sys_time_model
  where stat_name in ('DB CPU', 'DB time')
) stats, dba_hist_snapshot s
 where stats.instance_number=s.instance_number
  and stats.snap_id=s.snap_id
  and stats.dbid=s.dbid
  and s.dbid=3870213301
  and s.instance_number=1
  and stats.snap_id between 190 and 195
) where snap_id > min_snap_id and nvl(total_waits,1) > 0
) where event_name!='DB time' and wait_rank <= 5
order by inst_id, snap_id;

Inst Snap  Begin Snap        End Snap Event                            Waits    Time(s) Avg wait(ms)  % DB time Wait Class
---- ----- ----------------- -------- --------------------------- ---------- ---------- ------------ ---------- ---------------
   1   191 20-02-14 14:10:10 14:20:10 cell smart table scan           631829    9569.43           15      79.03 User I/O
                                      DB CPU                                    1202.09                    9.93 
                                      direct path read temp            66074    1006.82           15       8.32 User I/O
                                      PX Deq: Slave Session Stats      11730     429.91           37       3.55 Other
                                      latch: shared pool               28134     162.47            6       1.34 Concurrency
   1   192 20-02-14 14:20:10 14:30:11 cell smart table scan          1391832    4620.11            3      67.39 User I/O
                                      DB CPU                                    1017.78                   14.85 
                                      direct path read temp            76329     977.95           13      14.26 User I/O
                                      PX Deq: Slave Session Stats      25043     401.53           16       5.86 Other
                                      latch free                       38836      214.1            6       3.12 Other
   1   193 20-02-14 14:30:11 14:40:14 cell smart table scan          2448539   11075.29            5       79.3 User I/O
                                      DB CPU                                    1529.93                   10.95 
                                      PX Deq: Slave Session Stats      44242    1520.01           34      10.88 Other
                                      direct path read temp            77583     985.65           13       7.06 User I/O
                                      latch free                       67518     376.52            6        2.7 Other
   1   194 20-02-14 14:40:14 14:50:15 direct path read temp            99224      857.3            9      71.63 User I/O
                                      DB CPU                                     328.78                   27.47 
                                      name-service call wait              91        5.4           59       0.45 Other
                                      PX Deq: Slave Session Stats         83       0.17            2       0.01 Other
                                      direct path write                  194       0.12            1       0.01 User I/O
   1   195 20-02-14 14:50:15 15:00:18 DB CPU                                    1188.84                   98.15 
                                      log switch/archive                   1      10.01        10010       0.83 Other
                                      direct path read temp              775       3.96            5       0.33 User I/O
                                      cell smart table scan             1393        1.1            1       0.09 User I/O
                                      cell single block physical         148        0.9            6       0.07 User I/O
                                      read                                                                      
 
 
25 rows selected
 

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