Final answer:
Protocols for database recovery that avoid certain actions, like 'redo' or 'undo', don't require read operations to be logged, simplifying the recovery process by reducing the amount of logged information.
Step-by-step explanation:
The student's question refers to the protocols used for database recovery that avoid a specific issue, which is not mentioned in the question. However, typically such protocols would be aiming to avoid scenarios like redoing actions or undoing actions that are in-progress or not yet committed. Therefore, protocols that avoid these actions do not require that read operations be written to the system log, whereas other protocols that do not avoid these actions would require read operations to be recorded for recovery purposes.
In database systems, recording only write operations can simplify recovery processes under certain protocols as it reduces the amount of information that needs to be logged and processed during recovery. By not logging reads, protocols such as 'no-undo/no-redo' or 'steal/no-force' strategies prevent overwriting of uncommitted data and limit logging to only those operations that could affect database consistency if not properly redone during recovery.