如题，最近在一个开发库上存在硬盘空间紧张的问题，新添加了一块盘，准备把所有的数据文件挪到新盘上。
首先列出需要移动的数据文件，数据文件隶属于表空间，我们从表空间用途可以如下分门别类：
控制文件
System表空间
undo表空间
temporary表空间
redo日志文件
user_data表空间

SQL> select tablespace_name from dba_tablespaces;

TABLESPACE_NAME
------------------------------
SYSTEM
UNDOTBS1
SYSAUX
TEMP
USERS
GTLIONS
GTLIONSTMP

SQL> select file_name,file_id,tablespace_name from dba_data_Files;
FILE_NAME                          FILE_ID TABLESPACE_NAME
-------------------------------------------------- ---------- ------------------------------
/u01/Oracle/10g/oradata/gt10g/users01.dbf            4 USERS
/u01/oracle/10g/oradata/gt10g/sysaux01.dbf            3 SYSAUX
/u01/oracle/10g/oradata/gt10g/undotbs01.dbf            2 UNDOTBS1
/u01/oracle/10g/oradata/gt10g/system01.dbf            1 SYSTEM
/u01/oracle/10g/oradata/gt10g/gtlions01.ora            5 GTLIONS

SQL> select file_name,file_id,tablespace_name from dba_temp_Files;

FILE_NAME                          FILE_ID TABLESPACE_NAME
-------------------------------------------------- ---------- ------------------------------
/u01/oracle/10g/oradata/gt10g/temp01.dbf            1 TEMP
/u01/oracle/10g/oradata/gt10g/gtlionstmp01.ora            2 GTLIONSTMP

SQL> select name from v$controlfile;

NAME
------------------------------------------------------------------------------------------------------------------------------------------------------
/u01/oracle/10g/oradata/gt10g/control01.ctl
/u01/oracle/10g/oradata/gt10g/control02.ctl
/u01/oracle/10g/oradata/gt10g/control03.ctl

SQL> select member from v$logfile;

MEMBER
------------------------------------------------------------------------------------------------------------------------------------------------------
/u01/oracle/10g/oradata/gt10g/redo03.log
/u01/oracle/10g/oradata/gt10g/redo02.log
/u01/oracle/10g/oradata/gt10g/redo01.log

针对undo表空间，我们可以在打开数据的状态下直接操作：
SQL> create undo tablespace undotbs2 datafile '/u01/oracle/10g/oradata/gt10gnew/undotbs01.dbf' size 20m autoextend on;

Tablespace created.

SQL> show parameter undo_tablespace;

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
undo_tablespace              string     UNDOTBS1
SQL> alter system set undo_tablespace='undotbs2';

System altered.

SQL> show parameter undo_tablespace;

NAME                     TYPE     VALUE
------------------------------------ ----------- ------------------------------
undo_tablespace              string     undotbs2
SQL> drop tablespace undotbs1;

Tablespace dropped.

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