单项选择题

Note the following points describing various utilities ……

Note the following points describing various utilities in Oracle Database 1g：1. It enables the high-speed transfer of data from one database to another.
2. It provides a complete solution for the backup， restoration， and recovery needs of the entire database.3. It enables the loading of data from an external file into an Oracle database.4. It provides a tape backup management for the Oracle ecosystem.
Which point describes Oracle Secure Backup（）

A.1
B.2
C.3
D.4
E.1， 2， and 4
F.1， 2， 3， and 4

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单项选择题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（）

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