有同学在Oracle ALL STARS群中提问 如何通过AWR来查找一段时间内，数据库段对象(堆表、索引)等的空间增长信息。   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.   我们可以通过以下SQL脚本来列出相关段对象在 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 9999999999select   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('01-JAN-2000','DD-MON-RRRR')and to_timestamp('02-FEB-2013','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
/

使用示例：

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsSQL> conn maclean/maclean
Connected.
SQL>
SQL>
SQL>
SQL> create table check_size tablespace users as select  * from dba_objects where rownum=0;Table created.SQL> exec dbms_workload_repository.create_snapshot;PL/SQL procedure successfully completed.SQL> insert into check_size select * from dba_objects;75536 rows created.SQL> insert into check_size select * from check_size;75536 rows created.SQL> /151072 rows created.SQL> commit;Commit complete.SQL> insert into check_size select * from check_size;302144 rows created.SQL> insert into check_size select * from check_size;604288 rows created.SQL> commit;Commit complete.SQL> alter system checkpoint;System altered.SQL> exec dbms_workload_repository.create_snapshot;PL/SQL procedure successfully completed.SQL> @seg_histOWNER            OBJECT_NAME                          START_DAY   BLOCK_INCREASE
---------------- ------------------------------------ ----------- --------------
DBSNMP           BSLN_STATISTICS                      2012-MAR-18            224
DBSNMP           BSLN_STATISTICS_PK1                  2012-MAR-18            192
MACLEAN          CHECK_SIZE                           2012-MAR-22          96176
SH               CUSTOMERS                            2012-MAR-17              0SQL> select data_object_id from dba_objects where object_name='CHECK_SIZE';DATA_OBJECT_ID
--------------78062SQL> select seg.snap_id,2         seg.ts#,3         seg.space_used_total,seg.space_allocated_total,seg.SPACE_ALLOCATED_DELTAfrom dba_hist_seg_stat segwhere seg.DATAOBJ#=78062/  4    5    6    7    8  SNAP_ID        TS# SPACE_USED_TOTAL SPACE_ALLOCATED_TOTAL SPACE_ALLOCATED_DELTA
---------- ---------- ---------------- --------------------- ---------------------354          4         30909079              36700160              36700160355          4        123645655             149946368             113246208SPACE_USED_DELTA    Delta value for space used
SPACE_ALLOCATED_DELTA   Delta value for space allocated