Oracle Error ORA-01245: offline file string will be lost if RESETLOGS is done

Oracle Error Message

ORA-01245: offline file string will be lost if RESETLOGS is done

Reason for the Error

Attempting to do an OPEN RESETLOGS with a file that will be lost because it is offline. The file was not taken offline with the FOR DROP option.

Solution

Either bring the file online and recover it, or take it offline with the FOR DROP option.