单选题On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30am. Which option must you use to check whether a flashback operation can recover the database to the specified time?（）A Check the alert log fileB

题目
单选题
On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30am. Which option must you use to check whether a flashback operation can recover the database to the specified time?（）
A

Check the alert log file

B

Query the V$FLASHBACK_DATABASE_LOG view

C

Query the V$RECOVERY_FILE_DEST_SIZE view

D

Query the V$FLASHBACK_DATABASE_STAT view

E

Check the value assigned for the UNDO_RETENTION parameter

相似考题

1.On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30 am. Which option must you use to check whether a flashback operation can recover the database to the specified time? （）A. Check the alert log fileB. Query the V$FLASHBACK_DATABASE_LOG viewC. Query the V$RECOVERY_FILE_DEST_SIZE viewD.Query the V$FLASHBACK_DATABASE_STAT viewE. Check the value assigned for the UNDO_RETENTION parameter

2.You want to flash back a test database by five hours.You issue this command:SQL > FLASHBACK DATABASE TO TIMESTAMP (SYSDATE － 5／24);Which two statements are true about this flashback scenario?()A. The database must have multiplexed redo logs for the flashback to succeed.B. The database must be MOUNTED for the flashback to succeed.C. The database must use block change tracking for the flashback to succeed.D. The database must be opened in restricted mode for the flashback to succeed.E. The database must be opened with the RESETLOGS option after the flashback is complete.F. The database must be opened in read-only mode to check if the database has been flashed back to the correct SCN.

3.User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA, which commands must you execute to enable SCOTT to flash back the transactions?（）A、ALTER DATABASE FLASHBACK ON;B、GRANT SELECT any transaction TO scott;C、GRANT EXECUTE ON dbms_flashback TO scott;D、ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;E、ALTER TABLESPACE undots1 RETENTION GUARANTEE;F、ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY) COLUMNS;

4.You plan to execute the following command to perform a Flashback Database operation in your database:SQL> FLASHBACK DATABASE TO TIMESTAMP (SYSDATE －5／24);Which two statements are true about this?()A. The database must have multiplexed redo log filesB. The database must be in the MOUNT state to execute the commandC. The database must be in the NOMOUNT state to execute the commandD. The database must be opened in RESTRICTED mode before this operationE. The database must be opened with the RESETLOGS option after the flashback operation

更多“单选题On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30am. Which option must you use to check whether a flashback operation can recover the database to the specified time?（）A Check the alert log fileB ”相关问题

  • 第1题：

    You want to use the Flashback Transaction Query feature to identify all the changes made to your database within a specific time period. What is a prerequisite for using the Flashback Transaction Query feature？（）

    • A、 You must use automatic undo management in the database.
    • B、 You must configure OMF in your database.
    • C、 You must configure ASM for storing the datafiles.
    • D、 You must multiplex the online redo log file.

    正确答案:A

  • 第2题：

    Your database is open and running in ARCHIVELOG mode. You take RMAN full backups every Sunday night. On Monday morning， while querying the user1.employees table， you receive the following error message：  01578： ORACLE data block corrupted （file # 5， block # 51） ORA-01110： data file 5：  ’/u01/app/oracle/oradata/orcl/example01.dbf’  You need to rectify the corruption while ensuring the following： The data file should remain online.  The mean time to recover （MTTR） should be minimal.  You are not using a backup control file， and all the archived logs are accessible.   Which option would you choose？（）

    • A、flash back the corrupted blocks
    • B、use the DBMS_REPAIR package
    • C、use the RMAN TSPITR command
    • D、use the RMAN BLOCKRECOVER command
    • E、use the RESTORE DATABASE and RECOVER DATABASE commands
    • F、investigate the time at which the corruption occurred and perform a point-in-time recovery

    正确答案:D

  • 第3题：

    You plan to execute the following command to perform a Flashback Database operation in your database：   SQL> FLASHBACK DATABASE TO TIMESTAMP （SYSDATE -5/24）；   Which two statements are true about this？（）

    • A、 The database must have multiplexed redo log files
    • B、 The database must be in the MOUNT state to execute the command
    • C、 The database must be in the NOMOUNT state to execute the command
    • D、 The database must be opened in RESTRICTED mode before this operation
    • E、 The database must be opened with the RESETLOGS option after the flashback operation

    正确答案:B,E

  • 第4题：

    On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30 am. Which option must you use to check whether a flashback operation can recover the database to the specified time? （）

    • A、Check the alert log file
    • B、Query the V$FLASHBACK_DATABASE_LOG view
    • C、Query the V$RECOVERY_FILE_DEST_SIZE view
    • D、Query the V$FLASHBACK_DATABASE_STAT view
    • E、Check the value assigned for the UNDO_RETENTION parameter

    正确答案:B

  • 第5题：

    You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）

    • A、 The time when the last flashback operation in your database was performed.
    • B、 The time when the first flashback operation in your database was performed.
    • C、 A list of flashback operations performed in your database using SCN and time.
    • D、 The approximate time and the lowest system change number （SCN） to which you can flash back your database.

    正确答案:D

  • 第6题：

    Your database operates in ARCHIVELOG mode and all the tablespaces are online. Due to a user error， you decided to perform an incomplete recovery.  Which two tasks would you be required to perform in the recovery process？ （）

    • A、open the database with the RESETLOGS option
    • B、open the database with the RESTRICTED option
    • C、recover all the data files to the same system change number （SCN）
    • D、recover to the required SCN only that data file in which the error occurred

    正确答案:A,C

  • 第7题：

    You executed the following query in your database：  FROM V$FLASHBACK_DATABASE_LOG;  What would you determine from the output？（）

    • A、the time when the last flashback operation in your database was performed
    • B、the time when the first flashback operation in your database was performed
    • C、a list of flashback operations performed in your database using SCN and time
    • D、the approximate time and the lowest system change number （SCN） to which you can flash back your database

    正确答案:D

  • 第8题：

    单选题
    You work as a database administrator at Certkiller .com. Your database is open and running in ARCHIVELOGmode. You take RMANfull backups every Sunday night. On Monday morning， while querying the user1.employeestable， you receive the following error message：  01578： ORACLE data block corrupted （file # 5， block # 51）  ORA-01110： data file 5：’/u01/app/oracle/oradata/orcl/example01.dbf’  You need to rectify the corruption while ensuring the following：  The data file should remain online.  The mean time to recover （MTTR） should be minimal.  You are not using a backup control file and all the archived logs are accessible.  Which option would you choose？（）
    A

     flash back the corrupted blocks

    B

     use the DBMS_REPAIR package

    C

     use the RMAN TSPITR command

    D

     use the RMAN BLOCKRECOVER command

    E

     use the RESTORE DATABASE and RECOVER DATABASE commands

    F

     investigate the time at which the corruption occurred and perform a point-in-time recovery


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    You executed the following query in your database：  FROM V$FLASHBACK_DATABASE_LOG;  What would you determine from the output？（）
    A

    the time when the last flashback operation in your database was performed

    B

    the time when the first flashback operation in your database was performed

    C

    a list of flashback operations performed in your database using SCN and time

    D

    the approximate time and the lowest system change number （SCN） to which you can flash back your database


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table， you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that：  a） No other user data in the database is affected.  b） The operation takes the minimum possible time.  Which option would you choose？（）
    A

     Use ROLLBACK command with SCN 663571.

    B

     Perform Flashback Transaction Query with SCN 663571.

    C

     Execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571.

    D

     Execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571.


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（）
    A

     The time when the last flashback operation in your database was performed.

    B

     The time when the first flashback operation in your database was performed.

    C

     A list of flashback operations performed in your database using SCN and time.

    D

     The approximate time and the lowest system change number （SCN） to which you can flash back your database.


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    Every Sunday， consistent backups are performed on your database. Because of a user error， you performed an incomplete recovery on Tuesday and opened the database with the RESETLOGS option. A user error occurs again on Thursday， which necessitates an incomplete recovery. Sunday’s backup is the most recent backup available. What would you do in this scenario？（）
    A

    recovery cannot be performed because a backup was not performed after the last incomplete recovery

    B

    restore all the files from Sunday’s backup， and then perform an incomplete recovery up to the point in time when the user error occurred on Thursday

    C

    restore all the files from Sunday’s backup， and then recover up to the point in time when the RESETLOGS operation was performed on Tuesday

    D

    restore all the files from Sunday’s backup， and open the database to reset the database to the point in time when the backup was performed on Sunday


    正确答案： C
    解析： 暂无解析

  • 第13题：

    Every Sunday， consistent backups are performed on your database. Because of a user error， you performed an incomplete recovery on Tuesday and opened the database with the RESETLOGS option. A user error occurs again on Thursday， which necessitates an incomplete recovery. Sunday’s backup is the most recent backup available. What would you do in this scenario？（）

    • A、recovery cannot be performed because a backup was not performed after the last incomplete recovery
    • B、restore all the files from Sunday’s backup， and then perform an incomplete recovery up to the point in time when the user error occurred on Thursday
    • C、restore all the files from Sunday’s backup， and then recover up to the point in time when the RESETLOGS operation was performed on Tuesday
    • D、restore all the files from Sunday’s backup， and open the database to reset the database to the point in time when the backup was performed on Sunday

    正确答案:B

  • 第14题：

    You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command：  SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE 5/24）;  Which two statements are true？ （）

    • A、SYSDATE should not be used with TIMESTAMP.
    • B、The database must have multiplexed redo log files.
    • C、The database must be in the MOUNT state to execute the command.
    • D、The database must be opened with the RESETLOGS option after the flashback operation.
    • E、The entire database needs to be restored from the most recent backup before the flashback operation.

    正确答案:C,D

  • 第15题：

    You work as a database administrator at Certkiller .com. Your database is open and running in ARCHIVELOGmode. You take RMANfull backups every Sunday night. On Monday morning， while querying the user1.employeestable， you receive the following error message：  01578： ORACLE data block corrupted （file # 5， block # 51）  ORA-01110： data file 5：’/u01/app/oracle/oradata/orcl/example01.dbf’  You need to rectify the corruption while ensuring the following：  The data file should remain online.  The mean time to recover （MTTR） should be minimal.  You are not using a backup control file and all the archived logs are accessible.  Which option would you choose？（）

    • A、 flash back the corrupted blocks
    • B、 use the DBMS_REPAIR package
    • C、 use the RMAN TSPITR command
    • D、 use the RMAN BLOCKRECOVER command
    • E、 use the RESTORE DATABASE and RECOVER DATABASE commands
    • F、 investigate the time at which the corruption occurred and perform a point-in-time recovery

    正确答案:D

  • 第16题：

    What does the DB_FLASHBACK_RETENTION_TARGET parameter configure？（）  

    • A、 An upper limit on how far you can flash back the database，depending on the information in the redo logs
    • B、 An upper limit on how far you can flash back the database，depending on the information in the undo tablespace
    • C、 The amount of time for which the flashback data is to be kept in the flash recovery area， provided that there is enough space
    • D、 The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace，provided that there is enough space

    正确答案:C

  • 第17题：

    User SCOTT wants to back out the transactions on the REGIONS table in his schema. As a DBA， which commands must you execute to enable SCOTT to flash back the transactions？（）

    • A、 ALTER DATABASE FLASHBACK ON
    • B、 GRANT SELECT any transaction TO scott
    • C、 GRANT EXECUTE ON dbms_flashback TO scott
    • D、 ALTER DATABASE ADD SUPPLEMENTAL LOG DATA
    • E、 ALTER TABLESPACE undots1 RETENTION GUARANTEE
    • F、 ALTER DATABASE ADD SUPPLEMENTAL LOG DATA （PRIMARY KEY） COLUMNS

    正确答案:B,C,D,F

  • 第18题：

    You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table， you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that：  a） No other user data in the database is affected.  b） The operation takes the minimum possible time.  Which option would you choose？（）

    • A、use the ROLLBACK command with SCN 663571
    • B、perform Flashback Transaction Query with SCN 663571
    • C、execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571
    • D、execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571

    正确答案:D

  • 第19题：

    Flashback Database is enabled in your Oracle 10g database. One of your database users erroneously purged an important table residing in his schema. The table was purged sometime between 10：00 P.M. and 10：30 P.M. The next day， you decide to flash back the database. Before you flash back the database， you want to ensure that you have all the necessary flashback data. Which dynamic performance view must you use to determine whether you have the required flashback data to recover the purged table？（）

    • A、 V$DATABASE
    • B、 V$UNDOSTAT
    • C、 V$FLASHBACK_DATABASE_LOG
    • D、 V$FLASHBACK_DATABASE_STAT

    正确答案:C

  • 第20题：

    单选题
    You are working in an online transaction processing (OLTP) environment. You use the FLASHBACKTABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command, the system change number (SCN) was 663571. After flashing back the CUSTOMERS table, you realize that the table is not in the correct state. Now, you need to reverse the effects of the FLASHBACK TABLE command. Which is the fastest and the most efficient option to reverse the effects of the FLASHBACK TABLE command?（）
    A

    Restore the backup control file and open the database with RESETLOGS option.

    B

    Perform point-in-time recovery because flashback cannot be performed again on this table

    C

    Execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571

    D

    Execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    What does the DB_FLASHBACK_RETENTION_TARGET parameter configure？（）
    A

     An upper limit on how far you can flash back the database，depending on the information in the redo logs

    B

     An upper limit on how far you can flash back the database，depending on the information in the undo tablespace

    C

     The amount of time for which the flashback data is to be kept in the flash recovery area， provided that there is enough space

    D

     The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace，provided that there is enough space


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    Flashback Database is enabled in your Oracle 10g database. One of your database users erroneously purged an important table residing in his schema. The table was purged sometime between 10：00 P.M. and 10：30 P.M. The next day， you decide to flash back the database. Before you flash back the database， you want to ensure that you have all the necessary flashback data. Which dynamic performance view must you use to determine whether you have the required flashback data to recover the purged table？（）
    A

     V$DATABASE

    B

     V$UNDOSTAT

    C

     V$FLASHBACK_DATABASE_LOG

    D

     V$FLASHBACK_DATABASE_STAT


    正确答案： B
    解析： 暂无解析

  • 第23题：

    多选题
    You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command：  SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE ？5/24）； Which two statements are true？ （）
    A

    SYSDATE should not be used with TIMESTAMP.

    B

    The database must have multiplexed redo log files.

    C

    The database must be in the MOUNT state to execute the command.

    D

    The database must be opened with the RESETLOGS option after the flashback operation.

    E

    The entire database needs to be restored from the most recent backup before the flashback operation.


    正确答案： E,B
    解析： 暂无解析

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