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Oracle 回滾段空間回收步驟

是誰"偷偷的"用了那么多空間呢(本來有幾十個G的Free磁盤空間的)?
檢查數據庫表空間占用空間情況:

SQL> select tablespace_name,sum(bytes)/1024/1024/1024 GB

2 from dba_data_files group by tablespace_name

3 union all

4 select tablespace_name,sum(bytes)/1024/1024/1024 GB

5 from dba_temp_files group by tablespace_name order by GB;

TABLESPACE_NAME GB

------------------------------ ----------

USERS .004882813

UNDOTBS2 .09765625

SYSTEM .478515625

SYSAUX .634765625

WAPCM_TS_VISIT_DETAIL .9765625

HY_DS_DEFAULT 1

MINT_TS_DEFAULT 1

MMS_TS_DATA2 1.375

MMS_IDX_SJH 2

MMS_TS_DEFAULT 2

IVRCN_TS_DATA 2

TABLESPACE_NAME GB

------------------------------ ----------

MMS_TS_DATA1 2

CM_TS_DEFAULT 5

TEMP 20.5498047

UNDOTBS1 27.1582031

15 rows selected.

不幸的發現，UNDO表空間已經擴展至27G，而TEMP表空間也擴展至20G，這2個表空間加起來占用了47G的磁盤空間,導致了空間不足。
顯然曾經有大事務占用了大量的UNDO表空間和Temp表空間，Oracle的AUM(Auto Undo Management)從出生以來就經常出現只擴展,不收縮(shrink)的情況(通常我們可以設置足夠的UNDO表空間大小,然后取消其自動擴展屬性).
現在我們可以采用如下步驟回收UNDO空間:

1.確認文件

SQL> select file_name,bytes/1024/1024 from dba_data_files

2 where tablespace_name like 'UNDOTBS1';

FILE_NAME

--------------------------------------------------------------------------------

BYTES/1024/1024

---------------

+ORADG/danaly/datafile/undotbs1.265.600173875

27810

2.檢查UNDO Segment狀態

SQL> select usn,xacts,rssize/1024/1024/1024,hwmsize/1024/1024/1024,shrinks

2 from v$rollstat order by rssize;

USN XACTS RSSIZE/1024/1024/1024 HWMSIZE/1024/1024/1024 SHRINKS

---------- ---------- --------------------- ---------------------- ----------

0 0 .000358582 .000358582 0

2 0 .071517944 .071517944 0

3 0 .13722229 .13722229 0

9 0 .236984253 .236984253 0

10 0 .625144958 .625144958 0

5 1 1.22946167 1.22946167 0

8 0 1.27175903 1.27175903 0

4 1 1.27895355 1.27895355 0

7 0 1.56770325 1.56770325 0

1 0 2.02474976 2.02474976 0

6 0 2.9671936 2.9671936 0

11 rows selected.

3.創建新的UNDO表空間

SQL> create undo tablespace undotbs2;

Tablespace created.

4.切換UNDO表空間為新的UNDO表空間

SQL> alter system set undo_tablespace=undotbs2 scope=both;

System altered.

此處使用spfile需要注意，以前曾經記錄過這樣一個案例:Oracle診斷案例-Spfile案例一則
5.等待原UNDO表空間所有UNDO SEGMENT OFFLINE

SQL> select usn,xacts,status,rssize/1024/1024/1024,hwmsize/1024/1024/1024,shrinks

2 from v$rollstat order by rssize;

USN XACTS STATUS RSSIZE/1024/1024/1024 HWMSIZE/1024/1024/1024 SHRINKS

---------- ---------- --------------- --------------------- ---------------------- ----------

14 0 ONLINE .000114441 .000114441 0

19 0 ONLINE .000114441 .000114441 0

11 0 ONLINE .000114441 .000114441 0

12 0 ONLINE .000114441 .000114441 0

13 0 ONLINE .000114441 .000114441 0

20 0 ONLINE .000114441 .000114441 0

15 1 ONLINE .000114441 .000114441 0

16 0 ONLINE .000114441 .000114441 0

17 0 ONLINE .000114441 .000114441 0

18 0 ONLINE .000114441 .000114441 0

0 0 ONLINE .000358582 .000358582 0

USN XACTS STATUS RSSIZE/1024/1024/1024 HWMSIZE/1024/1024/1024 SHRINKS

---------- ---------- --------------- --------------------- ---------------------- ----------

6 0 PENDING OFFLINE 2.9671936 2.9671936 0

12 rows selected.

再看:

11:32:11 SQL> /

USN XACTS STATUS RSSIZE/1024/1024/1024 HWMSIZE/1024/1024/1024 SHRINKS

---------- ---------- --------------- --------------------- ---------------------- ----------

15 1 ONLINE .000114441 .000114441 0

11 0 ONLINE .000114441 .000114441 0

12 0 ONLINE .000114441 .000114441 0

13 0 ONLINE .000114441 .000114441 0

14 0 ONLINE .000114441 .000114441 0

20 0 ONLINE .000114441 .000114441 0

16 0 ONLINE .000114441 .000114441 0

17 0 ONLINE .000114441 .000114441 0

18 0 ONLINE .000114441 .000114441 0

19 0 ONLINE .000114441 .000114441 0

0 0 ONLINE .000358582 .000358582 0

11 rows selected.

Elapsed: 00:00:00.00

6.刪除原UNDO表空間

11:34:00 SQL> drop tablespace undotbs1 including contents;

Tablespace dropped.

Elapsed: 00:00:03.13

7.檢查空間情況
由于我使用的ASM管理,可以使用10gR2提供的信工具asmcmd來察看空間占用情況.

[oracle@danaly ~]$ export ORACLE_SID=+ASM

[oracle@danaly ~]$ asmcmd

ASMCMD> du

Used_MB Mirror_used_MB

21625 21625

ASMCMD> exit

空間已經釋放。

posted on 2007-12-27 00:50 john 閱讀(2252) 評論(1) 編輯收藏所屬分類: Oracle Technology


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# re: Oracle 回滾段空間回收步驟 2007-12-27 09:17 jeasonzhao

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