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You want to track and store all transactional changes to a t

题目
单选题
You want to track and store all transactional changes to a table over its lifetime. To accomplish this task, you enabled Flashback Data Archive with the retention of 5 years. After some time, the business requirement changed and you are asked to change the retention period from 5 years to 3 years. To accomplish this, you issued the following command: ALTER FLASHBACK ARCHIVE fla1 MODIFY RETENTION 3 YEARS; What is the outcome of this command?（）
A

The command produces an error because the retention period cannot be reduced

B

All historical data older than 3 years is purged from the flashback archive FLA1

C

All historical data is retained but the subsequent flashback data archives are maintained for only 3 years

D

All historical data is transferred to flashback logs and the flashback archive is refreshed to set a new retention time

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第3题：

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第4题：

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参考答案：D

第5题：

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第6题：

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正确答案：B
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第7题：

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第8题：

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正确答案：C
解答参考：C。本题问题为请问，百货商店该怎么走?。选项A好的，谢谢你和选项B很高兴答非所问，选项D不要烦我为非礼貌用语。

第9题：

Shop-assistant: May I help you, sir?

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参考答案：C

第10题：

You want to track and store all transactional changes to a table over its lifetime. To accomplish this task, you enabled Flashback Data Archive with the retention of 5 years. After some time, the business requirement changed and you are asked to change the retention period from 5 years to 3 years. To accomplish this, you issued the following command:ALTER FLASHBACK ARCHIVE fla1 MODIFY RETENTION 3 YEARS;What is the outcome of this command?（）

A. The command produces an error because the retention period cannot be reduced

B. All historical data older than 3 years is purged from the flashback archive FLA1

C. All historical data is retained but the subsequent flashback data archives are maintained for only 3 years

D. All historical data is transferred to flashback logs and the flashback archive is refreshed to set a new retention time


参考答案：B

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