Oracle重建Undo表空間

一臺開發機的空間不夠了，想挪也沒地方挪，檢查了一下，UNDOTBS01.DBF文件比較大了，有8個多G，決定重建一下回收。 原來的UNDO表空間名字是UNDOTBS1，DB版本是10G

1.新建一個新的UNDO表空間

C:\Documents and Settings\Administrator>sqlplus "/as sysdba"


SQL*Plus: Release 10.2.0.1.0 - Production on 星期四 3月 28 14:59:37 2013


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鏈接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options

SQL> create undo tablespace undotbs2 datafile ‘E:\oracle\product\oradata\orcl\undotbs02.dbf’ size 10M

2.切換到新的UNDO

SQL> alter system set undo_tablespace=’UNDOTBS2′ scope=both;
System altered

3.檢查新的表空間

SQL> show parameter undo;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
undo_management                      string      AUTO
undo_retention                       integer     900
undo_tablespace                      string      UNDOTBS2
SQL>

4.老的表空間OFFLINE

SQL> alter tablespace undotbs2 offline;
Tablespace altered

5.刪除老的表空間並檢查

SQL> drop tablespace undotbs2 including contents and datafiles; 
Tablespace dropped
SQL> select tablespace_name,segment_name,status from dba_rollback_segs;

TABLESPACE_NAME                SEGMENT_NAME                   STATUS
------------------------------ ------------------------------ ---------
SYSTEM                         SYSTEM                         ONLINE
UNDOTBS2                       _SYSSMU19$                     ONLINE
UNDOTBS2                       _SYSSMU20$                     ONLINE
UNDOTBS2                       _SYSSMU21$                     ONLINE
UNDOTBS2                       _SYSSMU22$                     ONLINE
UNDOTBS2                       _SYSSMU23$                     ONLINE
UNDOTBS2                       _SYSSMU24$                     ONLINE
UNDOTBS2                       _SYSSMU25$                     ONLINE
UNDOTBS2                       _SYSSMU26$                     ONLINE
UNDOTBS2                       _SYSSMU27$                     ONLINE
UNDOTBS2                       _SYSSMU28$                     ONLINE

已選擇11行。

6.刪除物理文件UNDOTBS01.DBF 7.其它說明 刪除物理文件時一開始沒有OFFLINE表空間，結果提示程序在用，這臺機子非生產機，重啓服務可刪除，至此空間回收,僅以此記。