单选题You are analyzing the components of the redo log mechanisms in your Oracle database. Which of the following purposes does the CKPT process serve?（）A Writes buffers to disk B Writes current redo log number to datafile headers C Writes redo log informati

题目
单选题
You are analyzing the components of the redo log mechanisms in your Oracle database. Which of the following purposes does the CKPT process serve?（）
A

Writes buffers to disk 

B

Writes current redo log number to datafile headers 

C

Writes redo log information to disk 

D

Reads information into memory for users

相似考题

1.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.

2.You are analyzing the components of the redo log mechanisms in your Oracle database. Which of the following purposes does the CKPT process serve?（）A、Writes buffers to disk B、Writes current redo log number to datafile headers C、Writes redo log information to disk D、Reads information into memory for users

3.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

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“单选题You are analyzing the components of the redo log mechanisms in your Oracle database. Which of the following purposes does the CKPT process serve?（）A Writes buffers to disk B Writes current redo log number to datafile headers C Writes redo log informati”相关问题

  • 第1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2题：

    You are adding redo logs to the Oracle database. Creating a new redo log adds information to which of the following Oracle resources? （）

    • A、Shared pool 
    • B、Control file 
    • C、SGA 
    • D、PGA

    正确答案:B

  • 第3题：

    In your production database， you have observed that the database server performance degrades whenever there is a switch between the log groups. On further investigation， you find that the database is running in ARCHIVELOG mode and the archived log files are being written to the same disk that is used to store the redo log members.  Which two actions would you take to improve the performance of the database server？ （）

    • A、increase the size of the redo log buffer
    • B、increase the number of redo log groups
    • C、increase the number of log writer processes
    • D、increase the number of ARCn processes
    • E、change the appropriate LOG_ARCHIVE_DEST_n parameter to place the archived log files in a separate location

    正确答案:B,E

  • 第4题：

    Which two statements about the background process of the database writer are true（）

    • A、It is possible to have multiple database writers in an Oracle instance.
    • B、It writes dirty buffers， if any， to data files whenever a checkpoint occurs.
    • C、It writes dirty buffers， if any， to data files whenever a transaction commits.
    • D、It writes dirty buffers， if any， to data files before the log writer （LGWR） writes

    正确答案:A,B

  • 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：

    Your database is in ARCHIVELOG mode. You have two online redo log groups each of which contains one redo member. When you attempt to start the database， you receive the following errors：   ORA-00313： open failed for members of log group 1 of thread 1   ORA-00312： online log 1 thread 1： ’D:///REDO01.LOG’   You discover that the online redo log file of the current redo group is corrupted.  Which statement should you use to resolve this issue？（）

    • A、 SQL>ALTER DATABASE DROP LOGFILE GROUP 1；
    • B、 SQL>ALTER DATABASE CLEAR LOGFILE GROUP 1；
    • C、 SQL>ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1；
    • D、 SQL>ALTER DATABASE DROP LOGFILE MEMBER ’D:///REDO01.LOG’；

    正确答案:C

  • 第7题：

    多选题
    In your production database， you have observed that the database server performance degrades whenever there is a switch between the log groups. On further investigation， you find that the database is running in ARCHIVELOG mode and the archived log files are being written to the same disk that is used to store the redo log members.  Which two actions would you take to improve the performance of the database server？ （）
    A

    increase the size of the redo log buffer

    B

    increase the number of redo log groups

    C

    increase the number of log writer processes

    D

    increase the number of ARCn processes

    E

    change the appropriate LOG_ARCHIVE_DEST_n parameter to place the archived log files in a separate location


    正确答案： B,E
    解析： 暂无解析

  • 第8题：

    单选题
    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.


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    You are adding redo logs to the Oracle database. Creating a new redo log adds information to which of the following Oracle resources? （）
    A

    Shared pool 

    B

    Control file 

    C

    SGA 

    D

    PGA


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Because of hardware failure， you decided to drop a redo log member from the database. Which condition should be met to drop a redo log file？（）
    A

     The redo log file should belong to an active group.

    B

     The redo log file should belong to an inactive group.

    C

     The redo log file should belong to the current group.

    D

     The redo log file can be dropped only if all the transactions are stopped.

    E

     Before a redo log file is dropped， it should be deleted from the operating system （OS）.


    正确答案： A
    解析： 暂无解析

  • 第11题：

    多选题
    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： C,B
    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：

    Because of hardware failure， you decided to drop a redo log member from the database. Which condition should be met to drop a redo log file？（）

    • A、 The redo log file should belong to an active group.
    • B、 The redo log file should belong to an inactive group.
    • C、 The redo log file should belong to the current group.
    • D、 The redo log file can be dropped only if all the transactions are stopped.
    • E、 Before a redo log file is dropped， it should be deleted from the operating system （OS）.

    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：

    Which background process reads the redo log buffer and writes it to a file？（）

    • A、ARCn
    • B、DBWn
    • C、CKPT
    • D、LGWR
    • E、PMON
    • F、SMON

    正确答案:D

  • 第17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18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 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21题：

    单选题
    You are analyzing the components of the redo log mechanisms in your Oracle database. Which of the following purposes does the CKPT process serve?（）
    A

    Writes buffers to disk 

    B

    Writes current redo log number to datafile headers 

    C

    Writes redo log information to disk 

    D

    Reads information into memory for users


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Which background process reads the redo log buffer and writes it to a file？（）
    A

    ARCn

    B

    DBWn

    C

    CKPT

    D

    LGWR

    E

    PMON

    F

    SMON


    正确答案： F
    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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