ORA-00376: file 65 cannot be read at this time
ORA-00376: file 63 cannot be read at this time
SQL> select file_id,tablespace_name,status from dba_data_files where file_id in(63,65);
FILE_ID TABLESPACE_NAME STATUS
---------- ------------------------------ ---------
65 UNDOTBS1 AVAILABLE
63 UNDOTBS1 AVAILABLE
SQL> select tablespace_name,status from dba_tablespaces where tablespace_name='UNDOTBS1';
TABLESPACE_NAME STATUS
------------------------------ ---------
UNDOTBS1 OFFLINE
alter tablespace UNDOTBS1 OFFLINE
Sat Jan 09 11:39:47 2008
Completed: alter tablespace UNDOTBS1 OFFLINE