ORA-00257: The Database Stopped Accepting Writes. The Archiver Is Stuck.

ORA-00257 isn't a crash — it's the archiver refusing to lose your redo. What 'connect internal only' actually means, why it's almost always a full Fast Recovery Area (ORA-19809) and not a database fault, how to read V$RECOVERY_FILE_DEST / V$RECOVERY_AREA_USAGE / V$ARCHIVE_DEST, the right fix (RMAN backup + delete, not rm), and a lab that forces ORA-00257 on a tiny FRA then clears it.