An image copy is a bit-for-bit duplicate of a database file, identical to a copy made
with an operating system command. (RMAN-created image copies are, however,
recorded in the RMAN repository, unlike file copies created using operating
system-level commands.)
Image copy backups can only be created on disk. RMAN can create image copies of
datafiles and datafile copies, control files and control file copies, archived redo logs,
and backup pieces. RMAN creates image copies when the AS COPY option is used with
the BACKUP command.
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