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_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.