A - create spfile from memory
https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/CREATE- SPFILE.html#GUID-D3E295B7-A3A4-43D3-8BBD-5CBE171A2E52 D - create password file using orapwd
https://www.thegeekdiary.com/how-to-create-the-oracle-password-file-using-orapwd-command/ F - lost datafiles can be offline dropped and recreated, index can be rebuild without need of recovery)