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1- Does Oracle RMAN support Incremental Update/Merge option for device type SBT ? Or its only supported for Disk ?

2 - During an update/merge operation during the incremental backup, does RMAN write directly into the image copy by updating the changed blocks ?

Thanks in advance

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1: Incremental image copy update is only supported on disk

2: Updating the image copy is done using a differential backupset. So you need the diff before you can update the image copy. A good description of the process is in the Oracle docs

For both answers, see the RMAN Backup and Recovery User's Guide: http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmbckba.htm#BRADV8186

Table 9-2 explains the process in detail.

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