单选题You work as a database administrator for Certkiller .com. Redo log files are not multiplexed in your database. Redo log blocks are corrupted in group 2， and archiving has stopped. All the redo logs are filled and database activity is halted. Database w

第1题：

In your database， online redo log files are multiplexed and one of the members in a group is lost due to media failure？ How would you recover the lost redo log member？（）

• A、 import the database from the last export
• B、 restore all the members in the group from the last backup
• C、 drop the lost member from the database and then add a new member to the group
• D、 restore all the database files from the backup and then perform a complete recovery
• E、 restore all the database files from the backup and then perform an incomplete recovery

第2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3题：

Redo log files are not multiplexed in your database. Redo log blocks are corrupted in group 2， and archiving has stopped. All the redo logs are filled and database activity is halted. Database writer has written everything to disk. Which command would you execute to proceed further？（）

• A、RECOVER LOGFILE BLOCK GROUP 2；
• B、ALTER DATABASE DROP LOGFILE GROUP 2；
• C、ALTER DATABASE CLEAR LOGFILE GROUP 2；
• D、ALTER DATABASE RECOVER LOGFILE GROUP 2；
• E、ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 2；

第4题：

A redo log file is corrupted while the database is open； as a consequence， database operations are stopped because archiving cannot continue. What would you do to solve the problem？（）

• A、 clear the redo log group
• B、 perform redo log file import
• C、 perform an incomplete recovery
• D、 perform a redo log recovery using Recovery Manager （RMAN）
• E、 shut down the database and open the database in the NOARCHIVELOG mode

第5题：

You work as a database administrator for Certkiller .com. Users in the Certkiller PROD database complain about the slow response when accessing the database. In the Active Session Waiting： Configuration page you find that the majority of the wait time is for the redo log buffer.Further investigation using the Run Queue graph and operating system tools reveals that the redo log files are on the same disks， and that the disk I/O for the redo log files is the reason for the performance degradation.  Which two actions would you take to gain performance？（）

• A、Increase the size of redo log files
• B、Increase the size of redo log buffer
• C、Increase the number of redo log files
• D、Place the redo log files on a separate disk
• E、Decrease the number of redo log groups to two
• F、Increate the number Log Writer （LGWR） process

第6题：

You are using Oracle Database 10g. You performed an  incomplete recovery of your database and opened the database with the RESETLOGS option.  What is the effect of opening the database with the RESETLOGS option？（）

• A、This operation resets the SCN for the database.
• B、This operation creates a new incarnation of the database.
• C、This operation moves all the redo log files to a different location.
• D、This operation deletes the old redo log files and creates new redo log files.
• E、This operation updates all current datafiles and online redo logs and all subsequent archived redo logs with a new RESETLOGS SCN and time stamp.

第7题：

You configured the Flash Recovery Area for your database. The database instance has been started inARCHIVELOG mode and the LOG_ARCHIVE_DEST_1 parameter is not set. What will be the implications onthe archiving and the location of archive redo log files（）

• A、Archiving will be disabled because the destination for the redo log files is missing.
• B、The database instance will shut down and the error details will be logged in the alert log file.
• C、Archiving will be enabled and the destination for the archived redo log file will be set to the Flash RecoveryArea implicitly.
• D、Archiving will be enabled and the location for the archive redo log file will be created in the default location$ORACLE_HOME/log.

第8题：

Redo log files are multiplexed in your database. The disk in which you have one of the redo log members is highly fragmented. In the process of defragmentation you lose the redo log member， which is not a member of the current group. How would you recover from the loss of the redo log member？（）

• A、SMON would automatically restore the lost file.
• B、You would need to restore the whole database from the last backup.
• C、You would need to restore the file from the last full database backup.
• D、You would need to use flashback technology to restore the lost redo log member.
• E、You would need to use Recovery Manager （RMAN） to restore the lost redo log member.
• F、You would need to restore the missing log file by copying one of the remaining files from the same group.

第9题：

You work as a database administrator for Certkiller .com. Your database is in NOARCHIVELOG mode. The database has been configured with three redo logs groups， and there have been five log switches. You lost one non-system-critical data file from your database.  Which method would you use to recover the data file？（）

• A、Restore all the data files and open the database
• B、Create the data file and performtablespacerecovery
• C、No need to restore any file， just recover the database
• D、Restore only the system data file and recover the database
• E、Restore only lost date file and performtablespacerecovery

第10题：

You are working on a database， where you have three redo log groups. When the database is down for a backup， an operating system （OS） user deletes all the redo log files in a group. What will happen when you open your database？（）

• A、 The instance starts， the database is mounted， but efforts to open the database fail， and an error about the missing redo log group is displayed.
• B、 Before the instance starts， you receive an error about the missing redo log files of a group.
• C、 The instance starts and the database opens with an error message written to the alert log file.
• D、 The instance starts and the database opens because two redo log groups still exist.
• E、 The instance starts and the database opens， but every attempt to write to redo log files fails with an error.