Conflict with the L1 backup task backup ARCHIVELOG

DB version: 11.2.0.4

Platform: RHEL 6.3

We have a backup archivelog that starts at 22:00 and an incremental backup that starts at 23:50.

The backup archivelog usually ends at 23:00. But lately, he took more time. Sometimes, he finished only at 12:30, which is like 40minutes after the incremental backup is started. That is, backup Archivelog overlaps with the incremental backup.

One of our colleagues has proposed adding 'FILESPERSET 1' to speed up the backup archivelog. So he changed the backup archivelog script of

BACKUP FORMAT '% s_ %%t p_ manhArc_' ARCHIVELOG ALL DELETE all THE ENTRY;

TO

BACKUP FILESPERSET 1 FORMAT '% s_ %%t p_ manhArc_' ARCHIVELOG ALL DELETE all THE ENTRY;

He gave the reason was that "this will prevent channels stuck with the unreachable archivelogs.

Question1. Adds 'FILESPERSET 1' really useful in this scenario?

Question2. 'FILESPERSET 1' in the archivelog script means 1 for each archivelog backup piece. Right? This means that a lot of backup in the backup media.

The justification is not applicable.

FILESPERSET 1 would not help you here.

Each consisting of 1 ArchiveLog BackupSet would result in a very large number of BackupSets.  Your controlfile would have to create a lot more locations for BackupSets.

Hemant K Collette

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