这道题谁能解释一下?

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查看11 | 回复7 | 2010-12-6 21:04:31 | 显示全部楼层 |阅读模式
Which two statements about Flashback Query are true? (Choose two.)
A.It is generated by using the redo log files.
B.It helps in row-level recovery from user errors.
C.It can be performed to recover ALTER TABLE statements
D.It fails when undo data pertaining to the transaction is overwritten.
E.The database has to be opened with the resetlogs option after performing Flashback Query.
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千问 | 2010-12-6 21:04:31 | 显示全部楼层
另外一题
While setting up an Oracle database for one of your critical applications, you want to ensure that the database is backed up at
regular intervals without your intervention. What should you do to achieve the objective?
A.configure the database to run in ARCHIVELOG mode
B.configure the Flash Recovery Area to enable automatic database backup
C.schedule the database backup using DBMS_JOB package after creating the database
D.schedule the database backup using Recovery Manager (RMAN) commands after creating the database
E.SCHEDULE THE DATabase backup using Database Configuration Assistant (DBCA) while creating the database
Answer : E
我觉得答案不对啊
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千问 | 2010-12-6 21:04:31 | 显示全部楼层
原帖由 Terry916 于 2008-9-18 20:38 发表
另外一题
While setting up an Oracle database for one of your critical applications, you want to ensure that the database is backed up at
regular intervals without your intervention. What should you do to achieve the objective?
A.configure the database to run in ARCHIVELOG mode
B.configure the Flash Recovery Area to enable automatic database backup
C.schedule the database backup using DBMS_JOB package after creating the database
D.schedule the database backup using Recovery Manager (RMAN) commands after creating the database
E.SCHEDULE THE DATabase backup using Database Configuration Assistant (DBCA) while creating the database
Answer : E
我觉得答案不对啊

这个在创建数据库时确实可以指定备份的
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千问 | 2010-12-6 21:04:31 | 显示全部楼层
恩,,,你自己建个DBCA试试,,好想在第5部的时候,有个指定一定时期自动备份的
第一道题目选BD
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千问 | 2010-12-6 21:04:31 | 显示全部楼层
看不懂啊。。。。。
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千问 | 2010-12-6 21:04:31 | 显示全部楼层
row-level recovery 是什么意思啊?
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千问 | 2010-12-6 21:04:31 | 显示全部楼层
原帖由 fanpig 于 2008-9-18 21:20 发表

这个在创建数据库时确实可以指定备份的

但是d也可以吧
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千问 | 2010-12-6 21:04:31 | 显示全部楼层
原帖由 Terry916 于 2008-9-19 13:52 发表
row-level recovery 是什么意思啊?


行级别recovery(恢复)
就是说你做了一个Update事务
并且Commint了 随后你发现中有一个Update是错误的
随后你只需要recovery这个行就可以了
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