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oracle+查表物理块数,如何统计一段时间内发生在某个表上的物理读写的块数

發(fā)布時間：2023/12/4 编程问答 40 豆豆

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script from maclean

http://www.askmaclean.com/archiv ... t-grow-history.html

Script:查找表或索引增長的歷史信息

MARCH 22, 2012 BY MACLEAN LIU 4 COMMENTS

有同學(xué)在Oracle ALL STARS群中提問如何通過AWR來查找一段時間內(nèi)，數(shù)據(jù)庫段對象(堆表、索引)等的空間增長信息。

在Oracle 10g開始awr自動負(fù)載倉庫引入了dba_hist_seg_stat視圖，該視圖記錄了快照時間內(nèi)segment-level段級的歷史統(tǒng)計(jì)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.

我們可以通過以下SQL腳本來列出相關(guān)段對象在快照時間內(nèi)的使用空間的歷史變化信息：

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：