Your test database is configured to run in NOARCHIVELOG mode. One of the data files in the USERS tablespace is lost due to a media failure. You notice that all the online redo logs have been…

Re-creating the data file alone cannot recover the lost data in NOARCHIVELOG mode; without archived logs, there is no mechanism to reconstruct the file's contents.

Restoring only the single lost data file is insufficient because without archived redo logs, it cannot be synchronized with the rest of the database, leaving the database in an inconsistent state.

In NOARCHIVELOG mode, Oracle cannot perform incomplete or point-in-time recovery because archived redo logs are not available to apply changes after a backup. With all online redo logs overwritten, there is no way to bring any restored file forward - the only valid recovery path is to shut down the instance, restore every database file from the last consistent (closed) backup, and restart, accepting the loss of all transactions since that backup.

Restoring only the USERS tablespace data files is not valid in NOARCHIVELOG mode with overwritten redo logs; the entire database must be restored from a consistent backup to ensure all files are synchronized.