REDUNDANCY and Level1 backups

Oracle Version -- 10.2.0.4
Backup Type -- Differential Incremental Backup
Current Retention policy -- Recovery window (4 days)
Sunday
Monday -------------> Level 0 Backup(3:00am)
Tuesday
Wednesday
Thursday ----------->Level 0 Backup (3:00am)
Friday
SaturdayWe have tested our Differential Incremental backup with RECOVERY WINDOW for 2 weeks. Due to space constraints, we don't think we can use RECOVERY WINDOW retention policy. So, we are thinking of going for REDUNDANCY.
I understand that, after setting REDUNDANCY as the retention policy: Monday's Level0 backup becomes obsolete on thursday when the next level 0 backup is run. We are fine with this. But we are worried about LEVEL 1 backups.
You cannot set a different separate RETENTION POLICY for level0 and level1 backups.
On Tuesday ---- We take a Level1 backup
On Wednesday ---- Will tuesday's Level1 backup become obsolete?Tuesday's level1 backup and the subsequent level1 backups shouldn't become obsolete until the next Level0 backup. Is RMAN binary intelligent enough to recognize this logic/requirement?

REDUNDANCY applies to the ability to recover the full database.
Your intermediate L1 backups would not be obsoleted until you do a fresh L0 backup.
Hemant K Chitale

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What's the difference between redundancy and recovery window for retention?

Hello all,
I'm still trying to get a grip on this concept for RMAN backup planning.
I recently ran into a situation as follows.
I have the backups set to a redundancy of 1.
I have instance1, which had GRID jobs to run RMAN backups as follows
Incremental database level=0 weekly at Wed at 2:30am
I have daily backups, incremental level=1 each evening
I have archive log backups through the day.
What happened, was that apparently on a Tues some time, the development team deleted data from almost every table in their schema.
The didn't discover this till midday or so on Wednesday.
I went to try to restore...and RMAN couldn't do it. I had found a SCN for early the Tues they did it...but I got the following error:
RMAN> RUN
2> {
3> SET UNTIL SCN 4590383198282;
4> RESTORE DATABASE;
5> RECOVER DATABASE;
6> }
executing command: SET until clause
Starting restore at 28-APR-10
allocated channel: ORA_SBT_TAPE_1
channel ORA_SBT_TAPE_1: SID=639 device type=SBT_TAPE
channel ORA_SBT_TAPE_1: NMO v4.5.0.0
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=638 device type=DISK
creating datafile file number=1 name=+DATADG/instance1/datafile/system.284.697137287
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 04/28/2010 15:53:00
ORA-01180: can not create datafile 1
ORA-01110: data file 1: '+DATADG/instance1/datafile/system.284.697137287'
From what research I did...it appears that since I did not have a level=0 incremental from before, it could not reset the database back in time. The previous one had been deleted since, I guess I had a redundancy of 1.
So, I thought I had a week backup they way I have it set..but that assumes that errors are found pretty quickly before the next level=0 backup.
I want at least 1 to 1.5 weeks worth of backups. I do have the problem that we do not have many tapes in rotation, so I cannot go for too long...may 2x weeks tops.
I'm trying to rethink my strategy, but I'm confused as I read as to the difference between setting RMAN retention with redundancy vs recovery window.
Can someone give me an explanation how you understand it? I'm reading on the web and in oracle books, and for some reason, it just isn't clear to me what is the best way to go....especially when I see that redundancy and recovery window might both be set??
Thank you in advance,
cayenne

Dear Cayenne
AFAIK RMAN doesn't claim that "you haven't enough backup". Please read the error you got carefully
ORA-01180: can not create datafile 1
ORA-01110: data file 1: '+DATADG/instance1/datafile/system.284.697137287'
and check the following link:
ORA-01180: Cannot create datafile 1 when doing RMAN restore onto 2nd server
Moreover, could you please use LIST BACKUP command and see whether you have enough backups?
Read "Redundancy Based Backup Retention Policy" from the following link:
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/strategy003.htm#sthref139

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The Level1 backup is taking more time than Level0, I really am frustated how could it happen. I have 6.5GB of database. Level0 took 8 hrs but level1 is taking more than 8hrs . please help me in this regard.

Ogan Ozdogan wrote:
Charles,
By enabling the block change tracking will be indeed faster than before he have got. I think this does not address the question of the OP unless you are saying the incremental backup without the block change tracking is slower than a level 0 (full) backup?
Thank you in anticipating.
OganOgan,
I can't explain why a 6.5GB level 0 RMAN backup would require 8 hours to complete (maybe a very slow destination device connected by 10Mb/s Ethernet) - I would expect that it should complete in a couple of minutes.
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A paraphrase from the book "Oracle Database 10g RMAN Backup & Recovery"
"Incremental backups must check the header of each block to discover if it has changed since the last incremental backup - that means an incremental backup may not complete much faster than a full backup."
Charles Hooper
Co-author of "Expert Oracle Practices: Oracle Database Administration from the Oak Table"
http://hoopercharles.wordpress.com/
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.

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The iPhone's backup does not include all content available on the iPhone. The backup does not include any iTunes content including 3rd party apps, and it doesn't include any photos transferred from your computer to your iPhone via the iTunes sync process.
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Posted this in another thread! Sounds stupid, but this will actually work.
1. Quit iTunes.
2. Start an elevated command prompt (Start Menu -> All Programs -> Accessories -> Right Click "Command Prompt" -> "Run as Administrator")
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Problem solved.
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Got it from another thread here: https://discussions.apple.com/thread/3383549?start=0&tstart=0
Thanks, sodaboy!!
.....Sean
Message was edited by: seanmcgu
One caveat is that the iPhone (mine is a 4S) doesn't "wake up" while this is happening and hitting the "Home" button does not display "slide to cancel" as it usually does during a backup. Oh well, it still worked!

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Did you happen to update early in the piece.. there is a supplement.
http://support.apple.com/kb/DL1599
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REDUNDANCY and Level1 backups

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