Final answer:
The lost-update problem caused by multi-user processing in databases can be prevented by database locking.
Step-by-step explanation:
The lost-update problem caused by multi-user processing in databases can be prevented by database locking. Database locking is a mechanism that allows only one user to access a particular data item at a time to avoid conflicts and ensure consistency. By implementing appropriate database locking techniques, such as share locks and exclusive locks, the lost-update problem can be prevented.