查询DB time：
SELECT INSTANCE_NUMBER, SAMPLE_TIME, DELTA DB_TIME
FROM (SELECT T1.SNAP_ID,
T1.INSTANCE_NUMBER,
TO_CHAR(T2.END_INTERVAL_TIME, 'YYYYMMDD HH24:MI:SS') AS SAMPLE_TIME,
T1.STAT_NAME,
T1.VALUE - LAG(T1.VALUE, 1) OVER(ORDER BY T1.SNAP_ID ASC) AS DELTA
FROM DBA_HIST_SYS_TIME_MODEL T1, DBA_HIST_SNAPSHOT T2
WHERE T1.INSTANCE_NUMBER = T2.INSTANCE_NUMBER
AND T1.INSTANCE_NUMBER = 1
AND T1.SNAP_ID = T2.SNAP_ID
AND T1.STAT_NAME = 'DB time'
AND T2.END_INTERVAL_TIME > SYSDATE - 30)
WHERE DELTA > 0
ORDER BY SNAP_ID ASC
IOPS:
SELECT snap_id,
intervalseconds,
t_begin,
t_end,
round(sum(delta) / intervalseconds) as iops
FROM (select t1.snap_id,
t1.instance_number,
extract(day from intervala) * 86400 +
extract(hour from intervala) * 3600 +
extract(minute from intervala) * 60 +
extract(second from intervala) as intervalseconds,
to_char(t2.begin_interval_time, 'YYYY-MM-DD HH24:MI:SS') AS T_BEGIN,
TO_CHAR(T2.END_INTERVAL_TIME, 'YYYY-MM-DD HH24:MI:SS') AS T_END,
T1.stat_NAME,
T1.value - LAG(T1.VALUE, 1) OVER(PARTITION BY T1.INSTANCE_nUMBER, t1.stat_name ORDER BY T1.SNAP_ID ASC) AS DELTA
from dba_hist_sysstat t1,
(select snap_id,
begin_interval_time,
end_interval_time,
instance_number,
(end_interval_time - begin_interval_time) as intervala
from dba_hist_snapshot
where instance_number = 1) t2
where t1.snap_id = t2.snap_id
and t1.STAT_NAME in
('physical read total IO requests',
'physical write total IO requests')
--and t1.instance_number = t2.instance_number
--and t1.instance_number = 3
and t2.begin_interval_time > sysdate - 30)
WHERE DELTA > 0
group by snap_id, intervalseconds, t_begin, t_end
order by snap_id asc;
log file sync:
with t as
(select s.snap_id,
s.instance_number,
s.end_interval_time,
total_waits - lag(total_waits, 1) over(partition by s.instance_number order by s.snap_id) waits,
(time_waited_micro - lag(time_waited_micro, 1)
over(partition by s.instance_number order by s.snap_id)) / 1000 twt
from dba_hist_system_event ev, dba_hist_snapshot s
where ev.instance_number = s.instance_number
and ev.instance_number = 1
and ev.snap_id = s.snap_id
and event_name = 'log file sync'
and s.end_interval_time > sysdate - 30)
select instance_number,
to_char(end_interval_time, 'YYYYMMDD HH24:MI') as sample_TIME,
sum(twt) waittime,
sum(waits) waitcount,
round(sum(twt) / sum(waits), 2) logfilesyncavgms
from t
where instance_number = 1
and waits > 0
group by to_char(end_interval_time, 'YYYYMMDD HH24:MI'), instance_number
order by 2, instance_number;