单选题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（）AThe MTTR Advisor is disabled.BThe database is in NOARCHIVELOG mode.CThe tablespace is already in backup mode.DThe Flash Recovery Area is not configured.
单选题
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.
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