单项选择题
Identify the memory component from which memory may be allocated for：（）
1. Session memory for the shared server
2. Buffers for I/O slaves
3. Oracle Database Recovery Manager （RMAN） backup and restore operations
A.Large Pool
B.Redo Log Buffer
C.Database Buffer Cache
D.Program Global Area （PGA）
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Inyourdatabaseinstance，theusersessionsareconnectedtothedatabaseserverfromtheremotemachines.Youwanttoachievethefollowingfortheseusers： 1.Theuseraccountmustbelockedafterfourunsuccessfulloginattempts. 2.Theusermustbepromptedtochangethepasswordatregularintervals. 3.Theusermaynothavemorethanthreesimultaneoussessions. 4.Theusersessionmustautomaticallybeloggedoffifmorethan10minuteselapsedtimeused. Howwouldyouaccomplishtheabove（）
A.By assigning profiles for the users
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C.By granting a secure application role to the users
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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
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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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