場景如下：

[root@localhost ~]# df -h

Filesystem 容量 已用 可用 已用% 掛載點

/dev/sda2 28G 26G 585M 98% /

/dev/sda1 190M 12M 169M 7% /boot

none 2.0G 0 2.0G 0% /dev/shm

/dev/sdb3 99G 93M 94G 1% /u02

1. 根目錄滿了，

2. /u02相對來說還有更大的空間，

3. 現在要把根目錄占用空間大的datafile，遷移到空間大的/u02上去

步驟如下：

1. 把數據文件遷移到/u02對應的目錄

[oracle@localhost hsbop]$ mv /u01/app/oracle/oradata/orcl/acptdat.dbf /u02/oradata/hsbop/acptdat.dbf

[oracle@localhost hsbop]$ mv /u01/app/oracle/oradata/orcl/acptidx.dbf /u02/oradata/hsbop/acptidx.dbf

[oracle@localhost hsbop]$ mv /u01/app/oracle/oradata/orcl/archdat.dbf /u02/oradata/hsbop/archdat.dbf

[oracle@localhost hsbop]$ mv /u01/app/oracle/oradata/orcl/archidx.dbf /u02/oradata/hsbop/archidx.dbf

2. 數據庫啟動到mount狀態

SQL> startup mount

ORACLE instance started.

Total System Global Area 536870912 bytes

Fixed Size 1220408 bytes

Variable Size 171966664 bytes

Database Buffers 356515840 bytes

Redo Buffers 7168000 bytes

Database mounted.

3. 進行數據文件的rename

SQL> alter database rename file ‘/u01/app/oracle/oradata/orcl/acptdat.dbf‘ to ‘/u02/oradata/hsbop/acptdat.dbf‘;

Database altered.

SQL> alter database rename file ‘/u01/app/oracle/oradata/orcl/acptidx.dbf‘ to ‘/u02/oradata/hsbop/acptidx.dbf‘;

Database altered.

SQL> alter database rename file ‘/u01/app/oracle/oradata/orcl/archdat.dbf‘ to ‘/u02/oradata/hsbop/archdat.dbf‘;

Database altered.

SQL> alter database rename file ‘/u01/app/oracle/oradata/orcl/archidx.dbf‘ to ‘/u02/oradata/hsbop/archidx.dbf‘;

Database altered.

4. 打開數據庫

SQL> alter database open;

Database altered.

###### 如果mv的時候 xshell斷開了，又重新mv了一下，會導致數據文件不完整，

###### 測試環境可以玩一下，通過把數據文件構造到和控制文件記錄的一致來騙過oracle，這個時候其實數據已經丟失了一部分

SQL> alter database open;

alter database open

*

ERROR at line 1:

ORA-01122: database file 19 failed verification check

ORA-01110: data file 19: ‘/u02/oradata/hsbop/ykhdat.dbf‘

ORA-01200: actual file size of 21087 is smaller than correct size of 64000

blocks

SQL> select 64000-21087 cnt from dual;

CNT

----------

42913

SQL> !dd if=/dev/zero of=/u02/oradata/hsbop/ykhdat.dbf bs=8192 count=42913 seek=21088

42913+0 records in

42913+0 records out

SQL> alter database open;

Database altered.

Oracle遷移數據文件