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Using backup database plus archivelog rman will make several steps: log switch (creates new archivelog) backup of archivelogs backup of datafiles log switch (creates new archivelog) backup of archivelogs for the time of db backup backup of controlfile and spfile; So here rman will create at least 4 backupsets: two - with archivelogs, one - with datafiles, ...


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Also from the Database Backup and Recovery User's Guide. The total number and size of backup sets depends mostly on an internal RMAN algorithm. However, you can influence RMAN behavior with the MAXSETSIZE parameter in the CONFIGURE or BACKUP command. By limiting the size of the backup set, the parameter indirectly limits the number of files in the ...


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