archivelog_disk,
посмотри статистику изменения сегментов.
select trunc(begin_interval_time,'DD') hour,owner,object_name,object_type,sum(physical_writes_delta) hour_phisical_writes
from DBA_HIST_SEG_STAT a,DBA_HIST_SNAPSHOT s,DBA_HIST_SEG_STAT_OBJ o
where a.snap_id=s.snap_id and o.obj#=a.obj# and o.dataobj#=a.dataobj# and object_type!='UNDEFINED'
and begin_interval_time >sysdate-1-- between to_date('01.03.2014 00','DD.MM.YYYY HH24') and to_date('02.03.2014 23','DD.MM.YYYY HH24')
group by trunc(begin_interval_time,'DD') ,owner,object_name,object_type
having sum( physical_writes_delta)>10000
order by 1 desc,5 desc;