SQL> shutdown abort;
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 3340451840 bytes
Fixed Size 2232960 bytes
Variable Size 2432699776 bytes
Database Buffers 889192448 bytes
Redo Buffers 16326656 bytes
Database mounted.
SQL> alter database datafile '/u01/oracle/oradata/yoon/undotbs_01.dbf' offline drop;
Database altered.
SQL> alter database open;
Database altered.
SQL> create undo tablespace undotbs1 datafile '/u01/oracle/oradata/yoon/undotbs01.dbf' size 1g;
Tablespace created.
SQL> alter system set undo_tablespace='undotbs1' scope=spfile;
System altered.
SQL> drop tablespace undotbs01 including contents and datafiles;
Tablespace dropped.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> create pfile from spfile;
File created.
SQL> startup
ORACLE instance started.
Total System Global Area 3340451840 bytes
Fixed Size 2232960 bytes
Variable Size 2432699776 bytes
Database Buffers 889192448 bytes
Redo Buffers 16326656 bytes
Database mounted.
Database opened.
转