problem:

SQL> alter tablespace xxx begin backup;
alter tablespace xxx begin backup
*
ERROR at line 1:
ORA-01123: cannot start online backup; media recovery not enabled

SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 13
Current log sequence 15

solution::

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.

Total System Global Area 414298112 bytes
Fixed Size 1300296 bytes
Variable Size 335546552 bytes
Database Buffers 71303168 bytes
Redo Buffers 6148096 bytes
Database mounted.
SQL> alter database archivelog;

Database altered.

SQL> alter database open;

Database altered.

SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 13
Next log sequence to archive 15
Current log sequence 15
SQL> alter tablespace xxx begin backup;

Tablespace altered.

SQL> alter tablespace xxx end backup;

Tablespace altered.

备注：这个主要是系统还没启动归档模式，所以无法进行热备份。

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ITPub博客

ORA-01123

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