What is a backup set?

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What is a backup set?

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A backup set is a backup that is taken using the RMAN's BACKUP command. A backup set is a logical grouping of one or more physical (binary) files called backup pieces. By default, one backup set contains only one backup piece. A backup piece contains backed up data files, control files, or archived log files. A backup set is stored in an RMAN-specific format. Therefore, a backup set cannot be manually restored. It must be restored using the Recovery Manager (RMAN) RESTORE command before it can be used by Oracle.

Backup sets are of two types: data file backup sets and archived log backup sets. A data file backup set is a backup of data files or control files. A data file backup set is compressed, i.e., it contains only used data blocks.

An archived log backup set is a backup of archived redo logs. An archived log backup set is not compressed.

A backup piece can belong to only one backup set. Backups of data files and archived redo logs cannot be stored in the same backup set.

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