碰到空间不够使怎办？DBF转移也是一个办法。
本实验成功了，但有一个疑问：systaux tablespace offline不确定是否造成其它数据无法访问。
https://blog.csdn.net/xionglang7/article/details/8284152，参考这里，但后面还有没做实验了。
实验开始：
SQL> alter tablespace system offline;
alter tablespace system offline
*
ERROR at line 1:
ORA-01541: system tablespace cannot be brought offline; shut down if necessary
看来system无法在线操作，不拿system下手了。
SQL> alter tablespace sysaux offline;
Tablespace altered.
SQL> alter tablespace sysaux rename datafile '/opt/oracle/oradata/ORCL/sysaux01.dbf' to
'/home/oracle/sysaux01.dbf';
alter tablespace sysaux rename datafile '/opt/oracle/oradata/ORCL/sysaux01.dbf' to
'/home/oracle/sysaux01.dbf'
*
ERROR at line 1:
ORA-01525: error in renaming data files
ORA-01141: error renaming data file 3 - new file '/home/oracle/sysaux01.dbf'
not found
ORA-01110: data file 3: '/opt/oracle/oradata/ORCL/sysaux01.dbf'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 7
看起来，目标端，必须先有东西啊。回到根目录下，su - oracle
[oracle@ora116 ~]$ cp /opt/oracle/oradata/ORCL/sysaux01.dbf /home/oracle/sysaux01.dbf;
因为tablespace已经offline了，所以应该不会造成数据不一致。
SQL> alter tablespace sysaux rename datafile '/opt/oracle/oradata/ORCL/sysaux01.dbf' to
'/home/oracle/sysaux01.dbf';
Tablespace altered. 居然可以啊，兴奋中
SQL> alter tablespace sysaux online;
Tablespace altered.
重启看看是否正常？
SQL> shutdown immediate;
ORA-01097: cannot shutdown while in a transaction - commit or rollback first
SQL> commit;
Commit complete.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup;
ORACLE instance started.
Total System Global Area 1258291200 bytes
Fixed Size 8792296 bytes
Variable Size 822085400 bytes
Database Buffers 419430400 bytes
Redo Buffers 7983104 bytes
Database mounted.
Database opened.
成功啦！把原来的/opt/oracle/oradata/ORCL/sysaux01.dbf删除，再重启，还是正常！喝酒去了