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 

题目
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.

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.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.

3.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.

4. 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

参考答案和解析
正确答案： A
解析： 暂无解析
更多“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 ”相关问题

  • 第1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

    正确答案:C

  • 第2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

    正确答案:B,D

  • 第3题：

    You are maintaining your database in Oracle10g. You are not using the recovery catalog to maintain the backup information of your database. Which file can be used as a repository to store information regarding the RMAN backup？（）

    • A、 online redo log files
    • B、 alert log files
    • C、 control file
    • D、 datafiles associated with the SYSTEM tablespace

    正确答案:C

  • 第4题：

    Your boss at Certkiller .com wants you to clarify Oracle 10g. Which two statements regarding the LOGGING clause of the CREATE TABLESPACE... statement are correcte？（）

    • A、This clause is not valid for a temporary or undotablespace.
    • B、If thetablespaceis in the NOLOGGING mode， no operation on thetablespacewill generate redo.
    • C、Thetablespacewill be IntheNOLOGGING mode by default， if not specified while creating atablespace.
    • D、Thetablespace-level logging attribute can be overridden by logging specification at the table， index， materialized view， materialized view log， and partition levels.

    正确答案:A,D

  • 第5题：

    Which statement about recovering from the loss of a redo log group is true?（）

    • A、If the lost redo log group is ACTIVE, you should first attempt to clear the log file.
    • B、If the lost redo log group is CURRENT, you must clear the log file.
    • C、If the lost redo log group is ACTIVE, you must restore, perform cancel-based incomplete recovery, and open the database using the RESETLOGS option.
    • D、If the lost redo log group is CURRENT, you must restore, perform cancel-based incomplete recovery, and open the database using the RESETLOGS option.

    正确答案:D

  • 第6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.

    正确答案:B

  • 第7题：

    单选题
    Which statement about recovering from the loss of a redo log group is true？（）
    A

     If the lost redo log group is ACTIVE， you should first attempt to clear the log file.

    B

     If the lost redo log group is CURRENT， you must clear the log file.

    C

     If the lost redo log group is ACTIVE， you must restore，perform cancel-based incomplete recovery，and open the database using the RESETLOGS option.

    D

     If the lost redo log group is CURRENT， you must restore，perform cancel-based incomplete recovery，and open the database using the RESETLOGS option.


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    ou are in the middle of a transaction updating a very important table. The machine on which adatabase was running reboots because of power outage. This caused a database instance failure.  Which statement is true in this 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.


    正确答案： C
    解析： 暂无解析

  • 第9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10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11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12题：

    单选题
    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


    正确答案： C
    解析： 暂无解析

  • 第13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.

    正确答案:D

  • 第15题：

    In the parameter file of your production database， the FAST_START_MTTR_TARGET parameter is set to 300 to optimize instance recovery. While observing the performance of the database during instance recovery， you find that the redo log files are not sized properly to support this activity. Which two sources could you use to determine the optimal size of the redo log files？（）

    • A、the V$LOG view
    • B、the V$DBFILE view
    • C、the V$LOGFILE view
    • D、the V$INSTANCE_RECOVERY view
    • E、Oracle Enterprise Manager Database Control

    正确答案:D,E

  • 第16题：

    Your boss at Certkiller .com wants you to clarify Oracle 10g. Which two steps are performed the first time any UPDATE statement is issued after the instance is started？（）

    • A、Creating the parse tree of the statement
    • B、Writing the modified data blocks to the data files
    • C、Writing the modified data to the archived redo log files
    • D、Updating the control file to indicate the most recent checkpoint
    • E、Updating the data file header to indicate the most recent checkpoint
    • F、Reading the blocks to database buffer cache if they are not already there

    正确答案:C,D

  • 第17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:C

  • 第18题：

    Which three statements are true about database recovery operations？（）

    • A、Damaged or lost data files are restored from backups.
    • B、Redo log file entries are used to roll forward the database.
    • C、Undo segments are used to roll back any uncommitted transactions.
    • D、Transactions that were active when the failure occurred are restarted.
    • E、Transactions that were active when the failure occurred are automatically committed during the recover procedure.

    正确答案:A,B,C

  • 第19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20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21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： C,D
    解析： 暂无解析

  • 第22题：

    单选题
    You are maintaining your database in Oracle10g. You are not using the recovery catalog to maintain the backup information of your database. Which file can be used as a repository to store information regarding the RMAN backup？（）
    A

     online redo log files

    B

     alert log files

    C

     control file

    D

     datafiles associated with the SYSTEM tablespace


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    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.


    正确答案： C
    解析： 暂无解析

  • 第24题：

    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 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.


    正确答案： A
    解析： 暂无解析

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