用命令方式管理Oracle的undo数据

1.登录数据库并查看undo表空间大小

[oracle@db1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Mon Apr 28 18:11:48 2014

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

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

FILE_NAME                                                                MB
--------------------------------------------------------------------------------

/u01/app/oracle/oradata/orcl1/users01.dbf                               5

/u01/app/oracle/oradata/orcl1/undotbs01.dbf                           50

/u01/app/oracle/oradata/orcl1/sysaux01.dbf                            510

/u01/app/oracle/oradata/orcl1/system01.dbf                            740

2.更改表空间大小

SQL> alter database datafile '/u01/app/oracle/oradata/orcl1/undotbs01.dbf' resize 250M;

Database altered.
3.查看是否更改成功

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

FILE_NAME                                                                MB
--------------------------------------------------------------------------------

/u01/app/oracle/oradata/orcl1/users01.dbf                                5

/u01/app/oracle/oradata/orcl1/undotbs01.dbf                           250

/u01/app/oracle/oradata/orcl1/sysaux01.dbf                            510

/u01/app/oracle/oradata/orcl1/system01.dbf                            740