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Why do we still need a persistent layer? There are 2 correct answers to this question.

Why do we still need a persistent layer? There are 2 correct answers to this question.
A . To store data that has been unloaded from memory
B . To enable full database recovery if we have a power failure
C . To hold the delta store for newly arrived records
D . To store data that is frequently used

Answer: A,B

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