在Oracle 10g开始awr自动负载仓库引入了dba_hist_seg_stat视图，该视图记录了快照时间内segment-level段级的历史统计信息：DBA_HIST_SEG_STAT displays historical information about segment-level statistics. This view captures the top segments based on a set of criteria and captures information from V$SEGSTAT. The total value is the value of the statistics since instance startup. The delta value is the value of the statistics from the BEGIN_INTERVAL_TIME to the END_INTERVAL_TIME in the DBA_HIST_SNAPSHOT view.
抓AWR快照. 默认是开启的.然后查
SYS@ora11g> select SNAP_ID,ts.name,round(TABLESPACE_SIZE blocksize/1048576) TABLESPACE_SIZE_mb,round(TABLESPACE_USEDSIZEblocksize/1048576) TABLESPACE_USED_maxSIZE,RTIME from DBA_HIST_TBSPC_SPACE_USAGE tsu,ts$ ts where tsu.TABLESPACE_ID = ts.ts# and ts.name='USERS' order by SNAP_ID,ts.name;

SNAP_ID NAME TABLESPACE_SIZE_MB TABLESPACE_USED_MAXSIZE RTIME
---------- ------------ ------------------ ----------------------- -------------------------

 1 USERS             5             4 12/28/2015 11:15:142 USERS             5             4 12/28/2015 12:00:203 USERS            14            12 12/28/2015 13:00:224 USERS            14            12 12/28/2015 13:00:235 USERS            38            36 12/28/2015 13:01:096 USERS               133               131 12/28/2015 13:01:287 USERS               530               504 12/28/2015 13:07:188 USERS              1018               992 12/28/2015 13:11:46

8 rows selected.

SYS@ora11g>

select ss.SNAP_ID,to_char(ss.BEGIN_INTERVAL_TIME,'YYYY-MM-DD HH24:MI:SS') BEGIN_INTERVAL_TIME,hsso.TABLESPACE_NAME,hsso.object_name,hsso.object_type,round(hss.SPACE_ALLOCATED_TOTAL/1048576) SPACE_TOTAL_size_mb,round(hss.SPACE_ALLOCATED_DELTA/1048576) SPACE_ALLOCATED_DELTA_size_mb
from dba_hist_snapshot ss,DBA_HIST_SEG_STAT_OBJ hsso,DBA_HIST_SEG_STAT hss
where

     ss.SNAP_ID = hss.SNAP_ID
andhss.OBJ#=hsso.obj#
andhsso.ts#=hss.ts#
andhsso.TABLESPACE_NAME='USERS'
andhsso.object_name='O1'

order by snap_id
SYS@ora11g> /

SNAP_ID BEGIN_INTERVAL_TIME TABLESPACE_NAME OBJECT_NAME OBJECT_TYPE SPACE_TOTAL_SIZE_MB SPACE_ALLOCATED_DELTA_SIZE_MB
---------- ------------------- --------------- ------------------------------ --------------- ------------------- -----------------------------

 3 2015-12-28 12:00:20 USERS           O1                  TABLE                8                  84 2015-12-28 13:00:22 USERS           O1                  TABLE                8                  05 2015-12-28 13:00:23 USERS           O1                  TABLE                   32                 246 2015-12-28 13:01:09 USERS           O1                  TABLE                  127                 957 2015-12-28 13:01:27 USERS           O1                  TABLE                  500                3738 2015-12-28 13:07:18 USERS           O1                  TABLE                  988                488

6 rows selected.

SYS@ora11g>

用快照ID和时间对应.来定位每次抓取时的空间使用量.
可以是表空间级别,也可以是segment级别