单选题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 requi

第1题：

The instance abnormally terminates because of a power outage.  Which statement is true about redo log filesduring 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 data files

第2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3题：

第4题：

You have configured the flash recovery area to store online redo log files， control files， archived redo logs and RMAN backups. Which of the following files can you successfully delete from the flash recovery area if you want to reclaim the space within it？（）

• A、 multiplexed control files
• B、 RMAN obsolete backups
• C、 multiplexed online redo log files
• D、 archived redo logs that have not been copied to tape

第5题：

The database is configured in ARCHIVELOG mode and regular complete database backups are taken. The loss of which two types of files may require a recovery with the RESETLOGS option？（）

• A、 Control files
• B、 Password files
• C、 Inactive online redo log file
• D、 Archived log files required to perform recovery
• E、 Newly created tablespace which is not backed up

第6题：

You configured the Flash Recovery Area （FRA） for your database. The database instance is running inARCHIVELOG mode. The default location for the archived redo log files is the Flash Recovery Area.  Which twofiles are removed automatically if the space is required in the FRA as per the retention policy（）

• A、Flashback log files
• B、Backups that have become obsolete
• C、User managed backups 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7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8题：

第9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10题：

Which three statements are true about the stages of database startup？（）

• A、Data files and redo log files can be renamed at the MOUNT stage.
• B、Control files are read at the OPEN stage for the location of data files.
• C、Control files are required to bring the database to the NOMOUNT stage.
• D、Data files and redo log files are made available to users at the OPEN stage.
• E、Data files and online redo log files are checked for consistency while opening the database