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

题目

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.
相似考题

1.The Oracle Database 11g database is running in the ARCHIVELOG mode. The archived redo log files are stored on three locations. The Flash Recovery Area is one of the locations. The details are given below:Which statement is true regarding what this command accomplishes?（）A. All archived redo log files backed up at least twice to tape are deleted.B. All archived redo log files backed up at least once to tape are eligible for deletion.C. All archived redo log files backed up at least twice to tape are deleted from the flash recovery area.D. All archived redo log files in local archiving destinations and the flash recovery area backed up at least twice to tape are eligible for deletion.

2.以下（）进程负责将Redo Log buffer里的数据写入Online redo log files。A、CKPTB、ARCnC、LGWRD、DBWn

3. 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.

4.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.

更多“Redo log files ”相关问题

  • 第1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.

    正确答案:B,C

  • 第2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

    正确答案:B

  • 第3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. 

    正确答案:D

  • 第4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.

    正确答案:B,E

  • 第5题：

    单选题
    Your boss at Certkiller .com 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.


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    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.


    正确答案： C
    解析： 暂无解析

  • 第7题：

    多选题
    You work as a database administrator for Supportcenter.cn. Users in the SupportCenter 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


    正确答案： F,D
    解析： 暂无解析

  • 第8题：

    单选题
    Which type of database file is spread across all disks in a disk group？（）
    A

     All types of files are spread across all disks in the disk group.

    B

     Datafiles

    C

     Redo log files

    D

     Archived redo log files

    E

     Control files


    正确答案： B
    解析： 暂无解析

  • 第9题：

    多选题
    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.


    正确答案： B,E
    解析： 暂无解析

  • 第10题：

    单选题
    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


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    You configured the Flash Recovery Area for your database. The database instance has been startedin ARCHIVELOG mode and the LOG_ARCHIVE_DEST_1 parameter is not set.  What will be the implications on the 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 FlashRecovery Area implicitly.

    D

    Archiving will be enabled and the location for the archive redo log file will be created in the defaultlocation $ORACLE_HOME/log.


    正确答案： A
    解析： 暂无解析

  • 第12题：

    Which type of database file is spread across all disks in a disk group？（）

    • A、 All types of files are spread across all disks in the disk group.
    • B、 Datafiles
    • C、 Redo log files
    • D、 Archived redo log files
    • E、 Control files

    正确答案:A

  • 第13题：

    You have the following online redo log configuration：    Group       Member   1     ’/disk1/oradata/redo01a.log’   2     ’/disk2/oradata/redo02a.log’   3     ’/disk3/oradata/redo03a.log’   You decide to multiplex the online redo log groups for recovery of redo log files in case of any disaster. Which two statements will you NOT issue to multiplex the online redo log files？（）

    • A、 ALTER DATABASE ADD LOGFILE MEMBER ’/disk1/oradata/redo01b.log’ TO GROUP 1；
    • B、 ALTER DATABASE ADD LOGFILE MEMBER ’/disk2/oradata/redo01b.log’ TO GROUP 1；
    • C、 ALTER DATABASE ADD LOGFILE MEMBER ’/disk1/oradata/redo02b.log’ TO GROUP 2；
    • D、 ALTER DATABASE ADD LOGFILE MEMBER ’/disk2/oradata/redo02b.log’ TO GROUP 2；
    • E、 ALTER DATABASE ADD LOGFILE MEMBER ’/disk1/oradata/redo3b.log’ TO GROUP 3；
    • F、 ALTER DATABASE ADD LOGFILE MEMBER ’/disk2/oradata/redo3b.log’ TO GROUP3；

    正确答案:A,C

  • 第14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.

    正确答案:A

  • 第15题：

    单选题
    The Oracle Database 11g database is running in the ARCHIVELOG mode. The archived redo log files are stored on three locations. The Flash Recovery Area is one of the locations. The details are given below：   LOG_ARCHIVE_DEST_1 = ’LOCATION = /disk1/archive’ LOG_ARCHIVE_DEST_2 = ’SERVICE = stdb1’ DB_RECOVERY_FILE_DEST = ’/u01/oradata’   Examine the following RMAN command issued to set the deletion policy for archived log files：   RMAN> CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 2 TIMES TO sbt； Which statement is true regarding what this command accomplishes？（）
    A

     All archived redo log files backed up at least twice to tape are deleted.

    B

     All archived redo log files backed up at least once to tape are eligible for deletion.

    C

     All archived redo log files backed up at least twice to tape are deleted from the flash recovery area.

    D

     All archived redo log files in local archiving destinations and the flash recovery area backed up at least twice to tape are eligible for deletion.


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    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.


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    Which components are needed for successful and most efficient recovery.（）
    A

     The backup RB3 and the current online redo log files

    B

     the backup RB2 and the archived redo log files after the log sequence number 15622

    C

     Backup R81 and the archived redo log hies after the log sequence number 12871

    D

     The backup RB3 and the archived redo log files after the log sequence number 16721


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    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


    正确答案： D
    解析： 暂无解析

  • 第19题：

    多选题
    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


    正确答案： A,B
    解析： 暂无解析

  • 第20题：

    单选题
    Examine the command：   ALTER DATABASE ADD SUPPLEMENTAL LOG DATA （PRIMARY KEY） COLUMNS；   What does the command accomplish？（）
    A

    Creates an additional copy of the database online redo log files. 

    B

    Stores the primary key column values of each row involved in a DML operation in the online redo log files. 

    C

    Stores the primary key column values of each row involved in a DML operation in the supplemental log files. 

    D

    Stores the old and new primary key column values of each row involved in a DML operation only when the primary key is modified in the online redo log files.


    正确答案： B
    解析： 暂无解析

  • 第21题：

    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 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.


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    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.


    正确答案： B
    解析： 暂无解析

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