单选题Which statement is true regarding the Archiver （ARCn） process，archived log files，and recovery？ （）A A database backup, combined with archived redo log files, guarantees that all committed data can be recovered to the point of failure. B During recovery 

第1题：

Which statement is true regarding the Archiver （ARCn） process，archived log files，and recovery？ （）

• A、A database backup, combined with archived redo log files, guarantees that all committed data can be recovered to the point of failure. 
• B、During recovery the ARCn background process copies its redo entries identified for recovery by the control file to the data files. 
• C、After each write to an archived log, the mandatory background process ARCn writes its log sequence number and the first and last SCN number within the log sequence to the control file. 
• D、At database recover time, and archived redo log is uniquely identified for recovery use by its redo thread number and destination ID number retrieved from the control file.

第2题：

You are in the middle of a transaction updating a very important table. The machine on which a database wasrunning reboots because of power outage. This caused a database instance failure. Which statement is true inthis situation（）

• A、The online redo log files and archived redo log files are required to accomplish the recovery.
• B、The uncommitted transaction will be committed at the next startup of the database instance.
• C、The uncommitted transaction is rolled back automatically at the next opening of the database.
• D、The DBA has to perform the recovery on the database to recover the uncommitted transaction

第3题：

Which two statements are true about checkpointing（）

• A、The checkpoint frequency decreases with the smaller redo log file size.
• B、It ensures that all committed data is written to the data files during normal shutdown.
• C、The frequent full checkpoint in a database can cause the overall degradation of the database performance.
• D、It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the online redo log files.

第4题：

You configured the Flash Recovery Area （FRA） for your database. The database instance is runningin ARCHIVELOG mode. The default location for the archived redo log files is the Flash Recovery Area.  Which two files are removed automaticallyif the space is required in the FRA as per the retention policy（）

• A、flashback log files
• B、backups that have become obsolete
• C、copies of the data files and control files
• D、archived redo log files that have multiple copies in a different archive location and not backed up

第5题：

While performing the backup of the flash recovery area, you notice that one of the archived redo log files is missing. You have multiple destinations for archived redo log files. What implications does it have on the backup of the flash recovery area?（）

• A、The backup fails because one of the archived redo log files is missing. 
• B、The backup succeeds but it would be without the missing archived log. 
• C、During backup, you are prompted for the alternative destination for the missing archived redo log file. 
• D、The backup succeeds because it fails over to one of the alternative archived redo log destinations. 

第6题：

Identify two situations in which you can use Data Recovery Advisor for recovery. （）(Choose two.)

• A、The user has dropped an important table that needs to be recovered.
• B、The database files are corrupted when the database is open.
• C、You are not able to start up the database instance because the required database files are missing.
• D、The archived log files are missing for which backup is not available.

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第13题：

Which  statements are true about checkpointing（）

• A、The checkpoint frequency decreases with the smaller redo log file size.
• B、It ensures that all committed data is written to the data files during normal shutdown.
• C、The frequent full checkpoint in a database can cause the overall degradation of the database performance.
• D、It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the onlineredo log files

第14题：

You performed an incomplete recovery and opened the database with the RESETLOGS option. The LOG_ARCHIVE_FORMAT parameter is set to ’ora_%t_%s_%r.log’.  Which statement regarding the archived redo log files， created in an earlier incarnation of the database，is true？（）

• A、 The archived redo log files will be overwritten.
• B、 The archived redo log files are deleted automatically.
• C、 The archived redo log files should be moved to some other location.
• D、 The archived redo log files are still maintained because the file names are unique.

第15题：

Identify two situations in which you can use Data Recovery Advisor for recovery.（） 

• A、 The user has dropped an important table that needs to be recovered.
• B、 The database files are corrupted when the database is open.
• C、 You are not able to start up the database instance because the required database files are missing.
• D、 The archived log files are missing for which backup is not available.

第16题：

The instance abnormally terminates because of a power outage. Which statement is true about redolog files during instance recovery（）

• A、Inactive and current redo log files are required to accomplish recovery.
• B、Online and archived redo log files are required to accomplish instance recovery.
• C、All redo log entries after the last checkpoint are applied from redo log files to data files.
• D、All redo log entries recorded in the current redo log file until the checkpoint position are applied to datafiles.

第17题：

Your boss at Supportcenter.cn wants you to clarify Oracle 10g. Which statement regarding the usage of redo log files during instance recovery is true？ （）

• A、Transactions are rolled back using redo log files.
• B、Transactions are rolled forward using redo log files.
• C、Transactions are rolled back using redo log files and archived log files.
• D、Transactions are rolled forward using redo log files and rolled back using redo log files.

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