You executed the following command to perform a backup of the USERS tablespace： SQL> ALTER TABLESPACE users BEGIN BACKUP； ALTER TABLESPACE users BEGIN BACKUP * ERROR at line 1： ORA-01123： cannot start online backup； media recovery not enabled What could be the reason for this error（）<br>A:The MTTR Advisor is disabled.<br>B:The database is in NOARCHIVELOG mode.<br>C:The tablespace is already in backup mode.<br>D:The Flash Recovery Area is not configured.

You executed the following command to perform a backup of the USERS tablespace： SQL> ALTER TABLESPACE users BEGIN BACKUP； ALTER TABLESPACE users BEGIN BACKUP * ERROR at line 1： ORA-01123： cannot start online backup； media recovery not enabled What could be the reason for this error（）
A:The MTTR Advisor is disabled.
B:The database is in NOARCHIVELOG mode.
C:The tablespace is already in backup mode.
D:The Flash Recovery Area is not configured.

出自：Oracle认证

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