What could be the reason for this error?

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?

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 database is in NOARCHIVELOG mode.

B.
Thetablespace is already in backup mode.

C.
The MTTR Advisor is disabled.

D.
The Flash Recovery Area is not configured.



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