Oracle UNDO Tablespace size & Table Size-优快云博客

本文详细介绍了在Oracle数据库中如何管理和调整UNDO表空间，包括查询当前UNDO设置，手动更改UNDO管理模式，以及如何通过SQL命令重新配置UNDO表空间。

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Table Space Query

select SEGMENT_NAME,bytes/1024/1024,a.* from dba_segments a

UNDO Table Space Size Full

数据库重启
SQL> shutdown abort
ORACLE 例程已经关闭。

SQL> quit
从 Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options 断
开

只有退出sqlplus环境，才能更改回滚段数据文件，删除回滚数据文件，模拟回滚段丢失

C:\Documents and Settings\Administrator>sqlplus "/as sysdba"
SQL*Plus: Release 10.2.0.4.0 - Production on 星期四 9月 9 22:23:50 2010
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
已连接到空闲例程。
SQL> startup
ORACLE 例程已经启动。
Total System Global Area  574619648 bytes
Fixed Size                1297944 bytes
Variable Size          234881512 bytes
Database Buffers       331350016 bytes
Redo Buffers             7090176 bytes
数据库装载完毕。

SQL> show parameter undo
NAME                               TYPE       VALUE
------------------------------------ ----------- ------------------------------
undo_management                   string    AUTO
undo_retention                      integer    900
undo_tablespace                   string    UNDOTBS1
SQL> alter system set undo_tablespace='undotbs4' scope=spfile;

http://www.itpub.net/thread-1346904-1-1.html

undo_management 设置与查询

3.问题处理
如果将UNDO置于自动管理模式下呢？这与undo_management参数（该参数的Oracle官方文档参考信息请访问：http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams221.htm#CHDBHHJC）有关，该参数默认是MANUAL，需要手工将其调整为AUTO。
SQL> show parameter undo_management

NAME                                 TYPE        VALUE
------------------------------------ ----------- ---------------
undo_management                      string      MANUAL

SQL> alter system set undo_management=AUTO scope=spfile;

System altered.

SQL> startup force nomount;
ORACLE instance started.

Total System Global Area 314572800 bytes
Fixed Size                  1219184 bytes
Variable Size              96470416 bytes
Database Buffers          213909504 bytes
Redo Buffers                2973696 bytes
SQL> show parameter undo_management

NAME                                 TYPE        VALUE
------------------------------------ ----------- ---------------
undo_management                      string      AUTO