获取活动会话最多的sample_time
v$active_session_history视图去挖掘信息
set linesize 260 pagesize 1000
alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select * from (
select inst_id,sample_time,sample_id,count(*)
from gv$active_session_history
where sample_time between
to_date('&date1', 'yyyy-mm-dd hh24:mi:ss') and
to_date('&date2', 'yyyy-mm-dd hh24:mi:ss')
and inst_id in (select instance_number from v$instance)
group by inst_id,sample_time,sample_id
order by sample_time)
dba_hist_active_sess_history视图去挖掘信息
set linesize 260 pagesize 1000
alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
select * from (
select INSTANCE_NUMBER,sample_time,sample_id,count(*)
from dba_hist_active_sess_history
where sample_time between
to_date('&date1', 'yyyy-mm-dd hh24:mi:ss') and
to_date('&date2', 'yyyy-mm-dd hh24:mi:ss')
and instance_number in (select instance_number from v$instance)
group by INSTANCE_NUMBER ,sample_time,sample_id
order by sample_time)
