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

题目

以下（）进程负责将Redo Log buffer里的数据写入Online redo log files。

  • A、CKPT
  • B、ARCn
  • C、LGWR
  • D、DBWn
相似考题

1. 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

2.The Log Writer （LGWR） process reads information from the （）and writes it to the online logs.A、large poolB、shared poolC、data buffer cacheD、redo log bufferE、data dictionary cache

3. 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 filesB、Increase the size of redo log bufferC、Increase the number of redo log filesD、Place the redo log files on a separate diskE、Decrease the number of redo log groups to twoF、Increate the number Log Writer （LGWR） process

4. 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.

更多“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”相关问题

  • 第1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2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3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,D,E

  • 第4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5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6题：

    In which scenario is a Database Administrator NOT required to perform an incomplete recovery？（）

    • A、 when all the online redo log groups are multiplexed and one of the members of a group is missing
    • B、 when all the online redo log groups are not multiplexed and one log group is missing
    • C、 when all the control files are missing
    • D、 when some important tables are deleted from the database and purged from the Recycle Bin

    正确答案:A

  • 第7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： C
    解析： 暂无解析

  • 第8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9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10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11题：

    多选题
    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,D
    解析： 暂无解析

  • 第12题：

    单选题
    You are maintaining your OLTP database in Oracle10g. While observing the performance of the database， you find that the log switch occurs more than once for every 20 minutes， affecting the database performance. Which factor is responsible for frequent log switches？（）
    A

    the value of the UNDO_RETENTION initialization parameter

    B

    the value of the optimal redo log file size provided by the Redo Logfile Size Advisor

    C

    the online redo log files size

    D

    the number of redo log members in a group


    正确答案： A
    解析： 暂无解析

  • 第13题：

    You are maintaining your OLTP database in Oracle10g. While observing the performance of the database， you find that the log switch occurs more than once for every 20 minutes， affecting the database performance. Which factor is responsible for frequent log switches？（）  

    • A、the value of the UNDO_RETENTION initialization parameter
    • B、the value of the optimal redo log file size provided by the Redo Logfile Size Advisor
    • C、the online redo log files size
    • D、the number of redo log members in a group

    正确答案:C

  • 第14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15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16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

  • 第17题：

    Your database is in NOARCHIVELOG mode. The database has three online redo log groups， and each group contains three online redo log members. The online redo log members are stored across three hard disks， E， F， and G， respectively. Hard disk G crashed while the LGWR background process was writing redo information to the online redo log files. What effect will this crash have on the database？（）

    • A、 The database will operate normally without generating any redo.
    • B、 The database will hang， and you must shut down and restart the instance.
    • C、 The database will crash， and you must recover the database from the point of failure.
    • D、 The database will operate normally and will generate minimal redo for the tables created with the NOLOGGING clause.

    正确答案:D

  • 第18题：

    The online redo log group configuration for your database is as follows： What will happen if the online redo log file ’ora02/oradata/redo02b.log’is corrupted while working on the database？（） 

    • A、 The database will hang.
    • B、 The database will be crashed.
    • C、 The database will be shut down.
    • D、 The LGWR process writes redo log entries to the other redo log member of the Group2 group

    正确答案:D

  • 第19题：

    单选题
    The online redo log group configuration for your database is as follows： What will happen if the online redo log file ’ora02/oradata/redo02b.log’is corrupted while working on the database？（）
    A

     The database will hang.

    B

     The database will be crashed.

    C

     The database will be shut down.

    D

     The LGWR process writes redo log entries to the other redo log member of the Group2 group


    正确答案： A
    解析： 暂无解析

  • 第20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21题：

    单选题
    The performance of your database is affected by the presence of two log members in each online redo log group and the placement of redo log members of a group on the same disk. You decide to place the redo log members of a group on separate disks. Which view will you query to find the name and location of all the online redo log members？（）
    A

     V$LOG

    B

     V$LOGFILE

    C

     DBA_LOG_GROUPS

    D

     V$LOG_HISTORY


    正确答案： A
    解析： 暂无解析

  • 第22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23题：

    单选题
    In which scenario is a Database Administrator NOT required to perform an incomplete recovery？（）
    A

     when all the online redo log groups are multiplexed and one of the members of a group is missing

    B

     when all the online redo log groups are not multiplexed and one log group is missing

    C

     when all the control files are missing

    D

     when some important tables are deleted from the database and purged from the Recycle Bin


    正确答案： A
    解析： 暂无解析

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