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In the ___________ scheme, a transaction that wants to update the database first creates a complete copy of the database.

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In the ___________ scheme, a transaction that wants to update the database first creates a complete copy of the database.

(a) Shadow copy

(b) Shadow Paging

(c) Update log records

(d) All of the mentioned

I had been asked this question during an online interview.

Origin of the question is Recovery in division Recovery System of Database Management

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The correct option is (a) Shadow copy

Easy explanation - If at any point the transaction has to be aborted, the system merely deletes the new copy. The old copy of the database has not been affected.

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