When multiple node failures occur, if one instance survives, then Oracle RAC performs instance recovery for any other instances that fail. If all instances of an Oracle RAC database fail, then Oracle Database automatically recovers the instances the next time one instance opens the database. The instance performing recovery can mount the database in either cluster database or exclusive mode from any node of an Oracle RAC database. This recovery procedure is the same for Oracle Database running in shared mode as it is for Oracle Database running in exclusive mode, except that one instance performs instance recovery for all of the failed instances.