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Datafile media recovery is sometimes alse called media recovery.
Datafile media recovery is used to recover from a damaged (or lost) datafile, control file or spfile. The goal of datafile media recovery is to restore database integrity.
In order for a datafile to be able to be recovered, either:
A media recovery sort of replays the redo generated to a restored block to make that block as of a certain time. Recovery of a datafile always begins with the lowest SCN recorded in the datafile header.
Differences to crash recovery
Datafile media recovery differs from crash recovery in the following points:
Causes for media recovery