单选题Because of a power outage, instance failure has occurred. From what point in the redo log does recovery begin and where does it end?()Acurrent redo log and inactive redo logBcheckpoint position to end of redo logCbeginning of redo log to end of redo logDall redo logs before the point of last commitEbeginning of redo log to checkpoint position

单选题
Because of a power outage, instance failure has occurred. From what point in the redo log does recovery begin and where does it end?()
A

current redo log and inactive redo log

B

checkpoint position to end of redo log

C

beginning of redo log to end of redo log

D

all redo logs before the point of last commit

E

beginning of redo log to checkpoint position


参考解析

解析: 暂无解析

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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

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

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

You configured the Flash Recovery Area for your database. The database instance has been started inARCHIVELOG mode and the LOG_ARCHIVE_DEST_1 parameter is not set. What will be the implications onthe 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 Flash RecoveryArea implicitly.D、Archiving will be enabled and the location for the archive redo log file will be created in the default location$ORACLE_HOME/log.

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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).

A database is running In ARCHIVBXXMS mode. It has two online redo log groups and each group has one member.  A LGWR Input/output (I/O) fells due to permanent media failure that has resulted In the loss of redo log file and the LWGR terminates causing the instance to crash. The steps to recover from the loss of a current redo log group member in the random order are as follow.   1) Restore the corrupted redo log group. 2) Restore from a whole database backup.  3) Perform incomplete recovery.  4) Relocate by renaming the member of the damaged online redo log group to a new location.  5) Open the database with the RESETLOGS option.  6) Restart the database instance.  7) Issue a checkpoint and clear the log.   Identify the option with the correct sequential steps to accomplish the task efficiently().  A、 1,3,4,and 5B、 7,3,4. and 5C、 2,3,4,and 5D、 7,4,3,and 5E、 Only 6 is required

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A redo log file is corrupted while the database is open; as a consequence, database operations are stopped because archiving cannot continue. What would you do to solve the problem?()A、 clear the redo log groupB、 perform redo log file importC、 perform an incomplete recoveryD、 perform a redo log recovery using Recovery Manager (RMAN)E、 shut down the database and open the database in the NOARCHIVELOG mode

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.

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.

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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.

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.

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.

单选题The instance abnormally terminates because of a power outage. Which statement is true about redolog files during instance recovery()AInactive and current redo log files are required to accomplish recovery.BOnline and archived redo log files are required to accomplish instance recovery.CAll redo log entries after the last checkpoint are applied from redo log files to data files.DAll redo log entries recorded in the current redo log file until the checkpoint position are applied to datafiles.

单选题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.

单选题A database is running In ARCHIVBXXMS mode. It has two online redo log groups and each group has one member.  A LGWR Input/output (I/O) fells due to permanent media failure that has resulted In the loss of redo log file and the LWGR terminates causing the instance to crash. The steps to recover from the loss of a current redo log group member in the random order are as follow.   1) Restore the corrupted redo log group. 2) Restore from a whole database backup.  3) Perform incomplete recovery.  4) Relocate by renaming the member of the damaged online redo log group to a new location.  5) Open the database with the RESETLOGS option.  6) Restart the database instance.  7) Issue a checkpoint and clear the log.   Identify the option with the correct sequential steps to accomplish the task efficiently().A 1,3,4,and 5B 7,3,4. and 5C 2,3,4,and 5D 7,4,3,and 5E Only 6 is required

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()AArchiving will be disabled because the destination for the redo log files is missing.BThe database instance will shut down and the error details will be logged in the alert log file.CArchiving will be enabled and the destination for the archived redo log file will be set to the FlashRecovery Area implicitly.DArchiving will be enabled and the location for the archive redo log file will be created in the defaultlocation $ORACLE_HOME/log.

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?()AWrites buffers to disk BWrites current redo log number to datafile headers CWrites redo log information to disk DReads information into memory for users

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?()AThe backup fails because one of the archived redo log files is missing. BThe backup succeeds but it would be without the missing archived log. CDuring backup, you are prompted for the alternative destination for the missing archived redo log file. DThe backup succeeds because it fails over to one of the alternative archived redo log destinations.

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).

单选题The instance abnormally terminates because of a power outage.  Which statement is true about redo log filesduring instance recovery()AInactive and current redo log files are required to accomplish recovery.BOnline and archived redo log files are required to accomplish instance recovery.CAll redo log entries after the last checkpoint are applied from redo log files to data files.DAll redo log entries recorded in the current redo log file until the checkpoint position are applied to data files

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.

单选题A redo log file is corrupted while the database is open; as a consequence, database operations are stopped because archiving cannot continue. What would you do to solve the problem?()A clear the redo log groupB perform redo log file importC perform an incomplete recoveryD perform a redo log recovery using Recovery Manager (RMAN)E shut down the database and open the database in the NOARCHIVELOG mode

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? ()ATransactions are rolled back using redo log files.BTransactions are rolled forward using redo log files.CTransactions are rolled back using redo log files and archived log files.DTransactions are rolled forward using redo log files and rolled back using redo log files.