多选题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？（）AThe database must have multiplexed redo log file

第1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.

第2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

第3题：

In which two cases would you perform only consistent backup？（）

• A、You are working on a database where downtime is not tolerated.
• B、You are working on a database where downtime can be tolerated.
• C、You are working on a database that operates in ARCHIVELOG mode.
• D、You are working on a database that operates in NOARCHIVELOG mode.
• E、You are working on a database where all the tablespaces are locally managed.
• F、You are working on a database where control files and redo log files are multiplexed.
• G、You are working on a database where control files and redo log files are not multiplexed.

第4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5题：

You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）

• A、 The time when the last flashback operation in your database was performed.
• B、 The time when the first flashback operation in your database was performed.
• C、 A list of flashback operations performed in your database using SCN and time.
• D、 The approximate time and the lowest system change number （SCN） to which you can flash back your database.

第6题：

You executed the following query in your database：  FROM V$FLASHBACK_DATABASE_LOG;  What would you determine from the output？（）

• A、the time when the last flashback operation in your database was performed
• B、the time when the first flashback operation in your database was performed
• C、a list of flashback operations performed in your database using SCN and time
• D、the approximate time and the lowest system change number （SCN） to which you can flash back your database

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第13题：

Which two statements are true regarding the database in ARCHIVELOG mode？（）

• A、You have to shut down the database to perform the backups.
• B、Archiving information is written to the data files and redo log files.
• C、You can perform complete database backups without closing the database.
• D、Online redo log files have to be multiplexed before putting the database in ARCHIVELOG mode.
• E、All the previous database backups become invalid after you configure the database to ARCHIVELOG mode.

第14题：

After performing a clean shut down of the database instance for maintenance， you mount the database andthen execute a command to open the database：SQL> ALTER DATABASE OPEN； Which two statements are true（）

• A、The online redo log files and online data files are opened.
• B、All the online data file headers are checked for consistency.
• C、Instance recovery is performed before opening the database.
• D、The path and existence of all the log file members are checked

第15题：

After performing a clean shut down of the database instance for maintenance， you mount thedatabase and then execute a command to open the database： SQL> ALTER DATABASE OPEN；  Which two statements are true（）

• A、The online redo log files and online data files are opened.
• B、All the online data file headers are checked for consistency.
• C、Instance recovery is performed before opening the database.
• D、The path and existence of all the log file members are checked

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 are managing a single instance Oracle 10g database that utilizes the following parameters：  Which of the following set of commands must you execute to enable Flashback Database？（）

• A、  STARTUP MOUNT EXCLUSIVE  ALTER DATABASE FLASHBACK ON；  ALTER DATABASE OPEN；
• B、  STARTUP MOUNT  ALTER DATABASE FLASHBACK ON；  ALTER DATABASE OPEN RESETLOGS；
• C、  STARTUP MOUNT EXCLUSIVE  ATLER DATABASE ARCHIVELOG；  ALTER DATABASE FLASHBACK ON；  ALTER DATABASE OPEN RESETLOGS；
• D、  STARTUP MOUNT  ALTER DATABASE ARCHIVELOG；  ALTER DATABASE FLASHBACK ON；  ALTER DATABASE OPEN；

第18题：

You have lost all your database control files. To recover them， you are going to use the results of the alter database backup controlfile to trace command. Your datafiles and your online redo logs are all intact.  Which of the following is true regarding your recovery？（）  

• A、 You will need to open the database with the resetlogs command.
• B、 All you need to do is execute the trace file from SQL*Plus and it will perform the recovery for you.
• C、 You will use the resetlogs version of the create controlfile command.
• D、 You will use the noresetlogs version of the create controlfile command.
• E、 You will use the trace file to create a backup control file， and then you will recover the database with the recover database using backup controlfile command

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