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单选题
A customer has a large amount of data stored on three database servers and is concerned that at present there is no disaster recovery plan in place. They have an existing tape backup solution that meets their backup window. In order to analyze potential disaster recovery plans， which of the following questions is the most important？（）
A
What is the minimum critical backup window？
B
Which server is handling the most critical data？
C
How much data is stored on each server？
D
What is the throughput of the hard drives？
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单选题One of your customer has six sites， three of which process a large amount of traffic among them.He plans to grow the number of sites in the future. Which is the most appropriate design topology？（）A
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单选题A server has six drives of equal size attached to a RAID controller. Which of the following fault tolerant RAID levels would allow the maximum amount of data to be stored？ （）A
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It produces an error because compression can be enabled at table creation only.C
It compresses all data added or modified henceforth but the existing data in the table is not compressed immediately.D
It immediately compresses all existing data as well as new data, resulting from either fresh additions or modifications to existing data.
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Memory，because the buffer cache requires a large amount of memory to maintain the data in system memoryC
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sector size and the amount of production dataB
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sector size and existing RAID levelsD
amount of production data and the disk drive speed
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full meshB
peer-to-peerC
partial meshD
hub and spoke
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