How to control RMAN backup of archive logs in FRA

Question

Setup:
11.2.0.2 GI
ASM Diskgroup for Fast Recovery Area
10.2.0.4 Enterprise Database
Without Catalog Database
To get familiar with Flashback Database we set up RMAN Backups
without deleting the archive logs,
as published in Oracle10g / 11g - Getting Started with Recovery Manager (RMAN) (Doc ID 360416.1)
"These deletions are managed by Oracle when space is required."
We observed that RMAN takes backups of all archive logs every time,
here we go with backing up archive logs every 30 minutes.
So the question is:
Is this (backing up all archive logs every time) the expected behavior or
the result of not using a catalog database or
any other mismatch?
thanx for any hint
Michael

Answer 1

Hi Michael,
In Note 360416.1 it refers to two archivelog backup commands.
BACKUP ARCHIVELOG ALL;and
BACKUP ARCHIVELOG FROM TIME 'SYSDATE-30' UNTIL TIME 'SYSDATE-7';Your question:
Is this (backing up all archive logs every time) the expected behavior or the result of not using a catalog database or any other mismatch?If you used the first script you will backup alle archivelogs everytime.
If you use the second one it will do a subset (probably not the range you want to backup...)
You could implement another script
BACKUP ARCHIVELOG NOT BACKED UP 2 TIMES;So every archivelog is only backed up twice.
Check
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14194/rcmsynta009.htm#i78895
for more information.
Regards,
Tycho