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redo操作是（）
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考题
系统故障恢复的步骤是A．反向扫描日志文件、对每一个更新操作执行逆操作，如此下去B．对每一个更新操作执行逆操作、反向扫描日志文件，如此下去C．正向扫描日志文件、对UNDO队列中的事务进行UNDO处理、对REDO队列中的事务进行REDO处理D．正向扫描日志文件、对REDO队列中的事务进行REDO处理、对UNDO队列中的事务进行UNDO处理
考题
Youhavethefollowingonlineredologconfiguration：GroupMember1’/disk1/oradata/redo01a.log’2’/disk2/oradata/redo02a.log’3’/disk3/oradata/redo03a.log’Youdecidetomultiplextheonlineredologgroupsforrecoveryofredologfilesincaseofanydisaster.WhichtwostatementswillyouNOTissuetomultiplextheonlineredologfiles？（）A.ALTERDATABASEADDLOGFILEMEMBER’/disk1/oradata/redo01b.log’TOGROUP1；B.ALTERDATABASEADDLOGFILEMEMBER’/disk2/oradata/redo01b.log’TOGROUP1；C.ALTERDATABASEADDLOGFILEMEMBER’/disk1/oradata/redo02b.log’TOGROUP2；D.ALTERDATABASEADDLOGFILEMEMBER’/disk2/oradata/redo02b.log’TOGROUP2；E.ALTERDATABASEADDLOGFILEMEMBER’/disk1/oradata/redo3b.log’TOGROUP3；F.ALTERDATABASEADDLOGFILEMEMBER’/disk2/oradata/redo3b.log’TOGROUP3；
考题
关于DM主备方案说法错误的是（）。A、主备方案的实现不需要依赖第三方软件B、主备方案基于逻辑日志复制C、主备方案基于物理日志复制D、基本原理是主机的REDO日志发送到远程备机，备机以此执行REDO操作，从而保持两者的数据同步
考题
关于检查点技术下面描述正确的是（）A、检查点之后开始故障点之前提交的事务需要undo操作B、检查点技术是为了提高故障恢复效率C、检查点之后开始故障点之前提交的事务需要redo操作D、检查点之前提交的事务不需要redo操作
考题
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 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
考题
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 logB、checkpoint position to end of redo logC、beginning of redo log to end of redo logD、all redo logs before the point of last commitE、beginning of redo log to checkpoint position
考题
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）.
考题
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；
考题
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.
考题
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.
考题
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.
考题
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
考题
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
考题
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 logB
checkpoint position to end of redo logC
beginning of redo log to end of redo logD
all redo logs before the point of last commitE
beginning of redo log to checkpoint position
考题
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）.
考题
问答题UNDO操作和REDO操作各做些什么事情？
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