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
Answer:A
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
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.