多选题Which three statements are true about Flashback Database?（）AFlashback logs are written sequentially, and are archived.BFlashback Database uses a restored control file to recover a database.CThe Oracle database automatically creates, deletes, and reside

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多选题

Which three statements are true about Flashback Database?（）

Flashback logs are written sequentially, and are archived.

Flashback Database uses a restored control file to recover a database.

The Oracle database automatically creates, deletes, and resides flashback logs in the Fast Recovery Area.

Flashback Database can recover a database to the state that it was in before a reset logs operation.

Flashback Database can recover a data file that was dropped during the span of time of the flashback.

Flashback logs are used to restore to the blocks' before images, and then the redo data may be used to roll forward to the desired flashback time.

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第1题：

You want to flash back a test database by five hours.You issue this command:SQL > FLASHBACK DATABASE TO TIMESTAMP (SYSDATE － 5／24);Which two statements are true about this flashback scenario?()

A. The database must have multiplexed redo logs for the flashback to succeed.

B. The database must be MOUNTED for the flashback to succeed.

C. The database must use block change tracking for the flashback to succeed.

D. The database must be opened in restricted mode for the flashback to succeed.

E. The database must be opened with the RESETLOGS option after the flashback is complete.

F. The database must be opened in read-only mode to check if the database has been flashed back to the correct SCN.

参考答案：E, F

第2题：

Which three statements are true about using flashback database in a multitenant container database(CDB)?（）

A、The root container can be flashed back without flashing back the pluggable databases (PDBs).
B、To enable flashback database, the CDB must be mounted.
C、Individual PDBs can be flashed back without flashing back the entire cdb.
D、The DB_FLASHBACK RETENTION_TARGET parameter must be set to enable flashback of the cdb.
E、A CDB can be flashed back specifying the desired target point in time or an SCN, but not a restore point.

正确答案:B,C,D

第3题：

Which three actions are required to configure the Flashback Database? ()

A. set Flash Recovery Area

B. enable Flashback logging

C. create FLASHBACK tablespace

D. start the database in the ARCHIVELOG mode

E. start the database in the NOARCHIVELOG mode

参考答案：A, B, D

第4题：

You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command： SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE ？5/24）； Which two statements are true？（）

A、 SYSDATE should not be used with TIMESTAMP.
B、 The database must have multiplexed redo log files.
C、 The database must be in the MOUNT state to execute the command.
D、 The database must be opened with the RESETLOGS option after the flashback operation.
E、 The entire database needs to be restored from the most recent backup before the flashback operation.

正确答案:C,D

第5题：

You are managing an Oracle Database 11g database. The database is open， and you plan to perform Recovery Manager （RMAN） backups. Which three statements are true about these backups（）

A、The backups would be consistent.
B、The backups would be inconsistent.
C、The backups would be possible only if the database is running in ARCHIVELOG mode.
D、The backups would be possible only if the database is running in NOARCHIVELOG mode.
E、The backups need to be restored and the database has to be recovered in case of a media failure

正确答案:B,C,E

第6题：

You are working on an Oracle Database 10g database. You enabled the Flashback Database feature. Which two statements regarding flashback logs are true？（）

A、 Flashback logs are not archived.
B、 Flashback logs are maintained in redo log files.
C、 Flashback logs are maintained in the Flash Recovery Area.
D、 Flashback logs are used to maintain Flashback Database related errors.
E、 Flashback logs need to be cleared manually after you disable Flashback Database.

正确答案:A,C

第7题：

You plan to execute the following command to perform a Flashback Database operation in your database： SQL> FLASHBACK DATABASE TO TIMESTAMP （SYSDATE -5/24）； Which two statements are true about this？（）

A、 The database must have multiplexed redo log files
B、 The database must be in the MOUNT state to execute the command
C、 The database must be in the NOMOUNT state to execute the command
D、 The database must be opened in RESTRICTED mode before this operation
E、 The database must be opened with the RESETLOGS option after the flashback operation

正确答案:B,E

第8题：

Which three statements are true about windows? ()(Choose three.)

A. Only one window can be open at any given time

B. Consumer groups are associated with windows

C. Windows work with job classes to control resource allocation

D. The database service name must be provided during windows creation

E. Windows can automatically start job or change resource allocation among jobs for various time periods.

参考答案：A, C, E

第9题：

These are the details about V$FLASHBACK_DATABASE_STAT： SQL> DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STAT view are true？（）

A、BEGIN_TIME is the time at which Flashback logging is enabled.
B、END_TIME is the time at which the query is executed on the view.
C、REDO_DATA is the number of bytes of redo data written during the interval.
D、This view contains information about flashback data pertaining to the last 24 hours.
E、FLASHBACK_DATA is the amount of flashback data generated since the database was opened.

正确答案:C,D

第10题：

These are the details about V$FLASHBACK_DATABASE_STAT： SQL> DESC v$FLASHBACK_DATABASE_STAT Name Null？ Type ------------- -------- -------------- BEGIN_TIME DATE END_TIME DATE FLASHBACK_DATA NUMBER DB_DATA NUMBER REDO_DATA NUMBER ESTIMATED_FLASHBACK_SIZE NUMBER Which two statements regarding the V$FLASHBACK_DATABASE_STATview aretrue？（）

A、 BEGIN_TIME is the time at which Flashback logging is enabled.
B、 END_TIME is the time at which the query is executed on the view.
C、 REDO_DATA is the number of bytes of redo data written during the interval.
D、 This view contains information about flashback data pertaining to the last 24 hours.
E、 FLASHBACK_DATA is the amount of flashback data generated since the database was opened.

正确答案:C,D

Which three statements are true about Flashback Database?（）

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