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- Backup piece is a physical binary file created by RMAN during a backup. They are written to a backup medium, such as disk or tape.
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Backup pieces contain blocks from the target database's datafiles, archived redo log files, and control files.
The following rules must be kept in mind while constructing a backup piece from datafiles:-
A datafile cannot span backup sets
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A datafile can span backup pieces as long as it stays within one backup set
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Datafiles and control files can coexist in the same backup sets
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Archived redo log files are never in the same backup set as datafiles or control files
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RMAN is the only tool that can operate on backup pieces; therefore, you must use the RMAN tool if you need to restore a file from an RMAN backup.
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Oracle Backup and Recovery Question