单选题Flashback Database relies on which technologies to recover to a point in time？（）AFlashback Data ArchiveBFlashback logs in the flash recovery areaCFlashbUndo tablespaceDRMAN command lineENone of the above

第1题：

Flashback Database relies on which technologies to recover to a point in time？（）  

• A、 Flashback Data Archive
• B、 Flashback logs in the flash recovery area
• C、 FlashbUndo tablespace
• D、 RMAN command line
• E、 None of the above

第2题：

You have joined a new organization as a Database Administrator. The Security Administrator in your organization has kept human errors， such as erroneously dropping users， tables， and important data， to a minimum by carefully granting only the necessary privileges to each user. As a result of several ongoing transactions within your database， you discover that the flashback logs are rapidly increasing in the flash recovery area. To avoid out-of-space errors， you decide to delete the flashback logs from the flash recovery area. How can you delete the flashback logs from the database if your database is up and running？（）

• A、 Shut down the database using the SHUTDOWN command. Mount the database using the STARTUP MOUNT EXCLUSIVE command and disable Flashback Database using the ALTER DATABASE FLASHBACK OFF statement.
• B、 Change the parameter setting in the SPFILE for the DB_RECOVERY_FILE_DEST parameter using the ALTER SYSTEM SET DB_RECOVERY_FILE_DEST=’’ SCOPE=BOTH statement while the database is up and running.
• C、 Shut down the database using the SHUTDOWN command. Mount the database using the STARTUP MOUNT EXCLUSIVE command. Change the parameter setting in the SPFILE for the DB_RECOVERY_FILE_DEST parameter using the ALTER SYSTEM SET DB_RECOVERY_FILE_DEST=’’ SCOPE=BOTH statement. Disable Flashback Database using the ALTER DATABASE FLASHBACK OFF statement.
• D、 Change the parameter setting in the SPFILE for the DB_RECOVERY_FILE_DEST parameter using the ALTER SYSTEM SET DB_RECOVERY_FILE_DEST=’’ SCOPE=BOTH statement. Shut down the database using the SHUTDOWN command. Mount the database using the STARTUP MOUNT EXCLUSIVE command and disable Flashback Database using the ALTER DATABASE FLASHBACK OFF statement.

第3题：

You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEES table. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area.  Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（）

• A、perform point-in-time recovery
• B、perform a Flashback Table operation to restore the table to the state it was in two days ago
• C、perform a Flashback Database operation to restore the database to the state it was in two days ago
• D、perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery

第4题：

What does the DB_FLASHBACK_RETENTION_TARGET parameter configure？（）  

• A、 An upper limit on how far you can flash back the database，depending on the information in the redo logs
• B、 An upper limit on how far you can flash back the database，depending on the information in the undo tablespace
• C、 The amount of time for which the flashback data is to be kept in the flash recovery area， provided that there is enough space
• D、 The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace，provided that there is enough space

第5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

第6题：

You performed a backup of the flash recovery area by using the following command for the first time： RMAN> BACKUP RECOVERY AREA;  Which files in the flash recovery area are backed up？（）

• A、flashback logs
• B、current control file
• C、control file autobackups
• D、incremental backup sets

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第13题：

You are working in an online transaction processing (OLTP) environment. You use the FLASHBACKTABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command, the system change number (SCN) was 663571. After flashing back the CUSTOMERS table, you realize that the table is not in the correct state. Now, you need to reverse the effects of the FLASHBACK TABLE command. Which is the fastest and the most efficient option to reverse the effects of the FLASHBACK TABLE command?（）

• A、Restore the backup control file and open the database with RESETLOGS option.
• B、Perform point-in-time recovery because flashback cannot be performed again on this table
• C、Execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571
• D、Execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571

第14题：

You disabled the Flashback Database feature by using the following command：  SQL> ALTER DATABASE FLASHBACK OFF；  What would be the effect of this command on the existing flashback logs？（）

• A、 Flashback logs are not deleted.
• B、 Flashback logs are deleted automatically.
• C、 Flashback logs are deleted only if you are using Recovery Manager （RMAN）
• D、 Flashback logs are deleted only if you are using Oracle Manager Files （OFM）
• E、 Flashback logs are deleted only if you are using Automatic Storage Management （ASM）

第15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.

第16题：

Which three statements are true about Flashback Database?（）

• A、Flashback logs are written sequentially, and are archived.
• B、Flashback Database uses a restored control file to recover a database.
• C、The Oracle database automatically creates, deletes, and resides flashback logs in the Fast Recovery Area.
• D、Flashback Database can recover a database to the state that it was in before a reset logs operation.
• E、Flashback Database can recover a data file that was dropped during the span of time of the flashback.
• F、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.

第17题：

You work as a database administrator at Certkiller .com. You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEEStable. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area. Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（）

• A、 perform point-in-time recovery
• B、 perform a Flashback Table operation to restore the table to the state it was in two days ago
• C、 perform a Flashback Database operation to restore the database to the state it was in two days ago
• D、 perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery

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