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Script:查找表或索引增长的历史信息

MARCH 22, 2012 BY MACLEAN LIU 4 COMMENTS

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 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('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

/

修改可得：

select   obj.owner, obj.object_name,

to_char(sn.BEGIN_INTERVAL_TIME,'RRRR-MON-DD') start_day,

sum(a.PHYSICAL_READS_DELTA) block_read

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

/