如何估算oracle 数据库，数据库对象历史增长情况
-----最近七天数据库的增长情况，这个只是一个估算值。
select sum(space_used_total)/1024/1024/1024 "last 7 days db increase - G"
from
dba_hist_seg_stat s,
dba_hist_seg_stat_obj o,
dba_hist_snapshot sn
where
s.obj# = o.obj#
and
sn.snap_id = s.snap_id
and begin_interval_time > sysdate-8
order by
begin_interval_time
/
以下再补充两个类似的脚本脚本来之网上：
scripts:查看数据库历史增长情况
查看数据库历史增长情况
此处是通过计算数据库所有表空间的历史增长情况来计算数据库历史情况。
--不含undo和temp
with tmp as
(select rtime,
sum(tablespace_usedsize_kb) tablespace_usedsize_kb,
sum(tablespace_size_kb) tablespace_size_kb
from (select rtime,
e.tablespace_id,
(e.tablespace_usedsize) * (f.block_size) / 1024 tablespace_usedsize_kb,
(e.tablespace_size) * (f.block_size) / 1024 tablespace_size_kb
from dba_hist_tbspc_space_usage e,
dba_tablespaces f,
v$tablespace g
where e.tablespace_id = g.TS#
and f.tablespace_name = g.NAME
and f.contents not in (‘TEMPORARY‘,‘UNDO‘))
group by rtime)
select tmp.rtime,
tablespace_usedsize_kb,
tablespace_size_kb,
(tablespace_usedsize_kb -
LAG(tablespace_usedsize_kb, 1, NULL) OVER(ORDER BY tmp.rtime)) AS DIFF_KB
from tmp,
(select max(rtime) rtime
from tmp
group by substr(rtime, 1, 10)) t2
where t2.rtime = tmp.rtime;
--含undo和temp
with tmp as
(select min(rtime) rtime,
sum(tablespace_usedsize_kb) tablespace_usedsize_kb,
sum(tablespace_size_kb) tablespace_size_kb
from (select rtime,
e.tablespace_id,
(e.tablespace_usedsize) * (f.block_size) / 1024 tablespace_usedsize_kb,
(e.tablespace_size) * (f.block_size) / 1024 tablespace_size_kb
from dba_hist_tbspc_space_usage e,
dba_tablespaces f,
v$tablespace g
where e.tablespace_id = g.TS#
and f.tablespace_name = g.NAME)
group by rtime)
select tmp.rtime,
tablespace_usedsize_kb,
tablespace_size_kb,
(tablespace_usedsize_kb -
LAG(tablespace_usedsize_kb, 1, NULL) OVER(ORDER BY tmp.rtime)) AS DIFF_KB
from tmp,
(select min(rtime) rtime
from tmp
group by substr(rtime, 1, 10)) t2 where t2.rtime = tmp.rtime
##############################################################
SQL脚本:列出相关段对象在 快照时间内的使用空间的历史变化信息：
column owner format a16
column object_name format a36
column start_day format a11
column block_increase format 9999999999
select obj.owner, obj.object_name,
to_char(sn.BEGIN_INTERVAL_TIME,‘RRRR-MON-DD‘) start_day,
sum(a.db_block_changes_delta) block_increase
from dba_hist_seg_stat a,
dba_hist_snapshot sn,
dba_objects obj
where sn.snap_id = a.snap_id
and obj.object_id = a.obj#
and obj.owner not in (‘SYS‘,‘SYSTEM‘)
and end_interval_time between to_timestamp(‘17-FEB-2014‘,‘DD-MON-RRRR‘)
and to_timestamp(‘25-FEB-2014‘,‘DD-MON-RRRR‘)
group by obj.owner, obj.object_name,
to_char(sn.BEGIN_INTERVAL_TIME,‘RRRR-MON-DD‘)
order by obj.owner, obj.object_name ;