I need to empty V$DBA_HIST_SEG_STAT view. I thought bouncing the instnace

Question

I need to empty V$DBA_HIST_SEG_STAT view. I thought bouncing the instnace would do that but unfornately not.
Does any one know how I would put all statistics to zero in this view and / or how to empty this view V$DBA_HIST_SEG_STAT.
Thanks.
Rav.

Answer 1

user12175804 wrote:
Yes, kind of , and this is the query that led me to inquire if emptying that table was possible.
with tmp_snap_obj_id as
select x.snap_id
, x.obj#
from (
select sn.snap_id
, s.obj#
, row_number() over (partition by s.obj# order by sn.end_interval_time desc) r
from dba_hist_seg_stat s
inner join dba_hist_snapshot sn on sn.snap_id = s.snap_id
) x
where x.r = 1
--select * from tmp_snap_obj_id
select
'.OBJECT_NAME' object_name
, 'START_TIME' start_time
, 'END_TIME' end_time
, 'Duration (Days Hours:Min:Sec)' Duration
, 'TOTAL_READS' total_reads
, 'TOTAL_WRITES' total_writes
from dual
union all
select
o.object_name
, TO_CHAR(sn.startup_time) start_time
, TO_CHAR(sn.end_interval_time) end_time
, TO_CHAR(sn.end_interval_time - sn.startup_time) "Duration (Days Hours:Min:Sec)"
, TO_CHAR(s.physical_reads_total) total_reads
, TO_CHAR(s.physical_writes_total) total_writes
from dba_hist_seg_stat s
inner join dba_hist_seg_stat_obj o on o.obj# = s.obj#
inner join dba_hist_snapshot sn on sn.snap_id = s.snap_id
inner join tmp_snap_obj_id z on z.snap_id = s.snap_id and z.obj# = s.obj#
where o.owner = 'SCARDBA'
and o.object_type = 'TABLE'
and o.object_name not like 'MLOG$%'
and o.object_name not like 'PLAN_TABLE%'
order by 1
So, I learnt something I did not know. Learning something new everyday and I like that. And I like Oracle in great deal as well.
Well, you got two more things to learn I believe. One, dba_hist_seg_stat is a view not a table. Second, touching any system tables for any kind of dmls, ddls would immediately make your db go unsupported and if something wrong happens after doing so, no one would be able to help you in it including OSS.
HTH
Aman....