What is the purpose of redoing completed transactions during a database recovery?

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Redoing completed transactions during a database recovery is primarily done to ensure data integrity. When a database system experiences a failure, it is crucial to maintain a consistent state that accurately reflects all committed transactions. By reapplying completed transactions, the database can recover all changes that were successfully committed before the failure occurred.

This process guarantees that the state of the database post-recovery is as if all these transactions were executed without interruption, preventing the loss of data integrity. If completed transactions were not redone, there could be discrepancies in the data, leading to potential corruption or loss of vital information. Therefore, the focus on maintaining a faithful representation of the database's prior state is essential for reliable operations.

The other contextual options, while related to the recovery process, do not encapsulate the primary purpose of redoing transactions. Discarding unneeded data, speeding up recovery, or creating additional backups serve different functions and do not directly address the core objective of preserving the integrity of committed transactional data after recovery.

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