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
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
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单选题You have configured flash recovery area in your database and you set the following Initialization parameters for your database instance： LOG_ARCHIVE_DEST 1 = ，，LOCATION=/disk1/arch MANDATORY’ LOG _ARCHIEVE_DEST 2 = ，，LOCATION=/disk2/arch’ LOG_ARCHIVK_DEST_3 = ，，LOCATION=/diSk3/arch LOG_ARCH1VK_DEST_4 = ’ LOCATION=/disk4/arch’ LOG_ARCHIVE_MIN-SUCCEED_DEST = 2 While the database instance is functional，you realized that the destination set by the LOG_ARCHIVE_DEST_I parameter Is not available for the archived redo log file to be created in. All redo log groups have been used. What happens in an event of log switch？（）A The online redo log file Is not allowed to be overwritten.B The archived redo log files are written to the flash recovery area until the MANDATORY destination is made available.C The database instance will crash because the archived redo log file cannot be created in a destination set as MANDATORY.D The destination set by the LOG_ARCHIVE_DEST_1 parameter is ignored and the archived redo log files are created in the next two available locations to guarantee archive log success.
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.
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（）AThe online redo log files and archived redo log files are required to accomplish the recovery.BThe uncommitted transaction will be committed at the next startup of the database instance.CThe uncommitted transaction is rolled back automatically at the next opening of the database.DThe DBA has to perform the recovery on the database to recover the uncommitted transaction
单选题Which statement is true regarding the Archiver （ARCn） process，archived log files，and recovery？ （）AA database backup, combined with archived redo log files, guarantees that all committed data can be recovered to the point of failure. BDuring recovery the ARCn background process copies its redo entries identified for recovery by the control file to the data files. CAfter 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. DAt 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.