Fast Incremental Backup

Hi,
I'm looking for some answers regarding Block Change Tracking or Fast Incremental Backup, but was not successful searching in Google and Oracle documentation so far. Maybe I will have more luck here....
Following:
A) From what I understand, after enabling block change tracking, a level 0 backup is required in order for the block change tracking file to have a reference. Level 0 backups can be done as backupset, image copy. Which one does it apply to? Which incremental level and backup type does it apply to?
B) The block change tracking is a live file that records as changes are made. If I disable block change tracking, the block change tracking file will be deleted, provided it is in an oracle managed file location. When I enable block change tracking a new file will be created. What happens if I disable and re-enable block change tracking after a level 0 and level 1 backup? Will fast incremental backup be ignored until the next level 0 backup? Does a level 0 backup clear the block change tracking file?
C) What happens if the block change tracking file gets corrupt? What if lost. I was reading if it is lost than it will automatically be recreated at next restart of the database.
D) I guess in a RAC, the block change tracking file will have to be in a cluster shared location?
E) To enable block change tracking the database has to be in mount mode. I assume it is updating the controlfile. What happens when restoring a database using the backup controlfile? I guess I will have to delete the existing block change tracking file in order to enable block change tracking using the same file?
Thanks.

Newer versions of the Oracle backup and recovery documentation obviously cover more topics.
Using: http://www.oracle.com/pls/db111/homepage seraching for "block change tracking"
I found http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/rcmbckba.htm#BRADV8125
which covers Space Management in the Block Change Tracking File.
I'm able to answer some of my questions:
B) The change tracking file maintains bitmaps that mark changes in the datafiles between backups. The database performs a bitmap switch before each backup. After the maximum of 8 bitmaps is reached, the most recent bitmap is overwritten by the bitmap that tracks the current changes.
According to this I understand that I will have to perform a level 0 backup after every 7 days, otherwise block change tracking will not work, and if I enable and disable BCT and delete the BCT file, than fast incremental backup will only work after the next level 0 backup.
D) In a Real Applications Clusters (RAC) environment, the change tracking file must be located on shared storage accessible from all nodes in the cluster.
E) After a restore and recovery, the change tracking file is cleared, and starts recording block changes again. The BTC file is recored in the controlfile.
I'm not yet sure about A) whether or not BTC also applies to image copy backup and question C.

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Greetings all,
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Your Majesty!!
Sounds like your incremental backups are quite fast!
I have a mid 2011 iMac with SSD and 2TB HDD, and Time Machine incremental backups take anything up to 5 hours, sometimes longer. Trivial amounts of data are usually involved, but the log reports very large numbers of files.
One time I completed a Time Machine backup, rebooted and initiated another backup immediately with very few apps running (Console, Activity Monitor), and after several hours, the backup log said it had backed up over 800,000 files but only a very small amount of data.
I have a case open with AppleCare since July 1st. They have a whole lot of logs and other information being analyzed.
You will find others who have the same unresolved problem at - https://discussions.apple.com/thread/3144862?start=0&tstart=0

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Hi all,
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thanx

Hi,
Do we need to take backup of the tracking file?
I was wondering how the backup of a tracking file will help us. If we lost some of our hard disk and then we restore an old tracking file, then how oracle will be able to catch up the missing changes?
Tracking file is useful only for a very quick locating the datablocks that were changed after the last backup. It doesn't help us in during restore process. I think we will need a full backup of the database, if we loose the tracking file.
HTH
Regards,
Badri.

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"ps why is Apple's Backup only available with .Mac?"
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You can look at Retrospect here:
http://www.emcinsignia.com/
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Martin_Had a écrit:
Thank you Andaleeb. I appear to have an old backup of a year ago, and a more recent full back up plus an incremental backup.
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Hi Kumar2000,
I tried to answer anas query here, you may want to go through the same.
https://supportforums.cisco.com/discussion/12142716/acs-inceremental-backup-turns
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Jatin Katyal
*Do rate helpful posts*

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I finally did two things:
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What is the current DB size that you have?
Note that the message is misleading (messages I got with my ACS are the same) because they mention incremental backup in the message title and then say on-demand full backup failed!
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HTH
Amjad
Rating useful replies is more useful than saying "Thank you"

Time Machine won't do incremental backups after I restored my computer

I am using a macbook (2010 version) and operating Lion. I had a problem with my Macbook where it wouldn't log on, even in safe mode, so I restored it using Timemachine. Now that everything is back up and running well I want to keep backing up. But Time Machine now says that there is not eneough space on the backup disk as it wants to back up the whole computer alongside the exisitng back up. In short it will no longer do incremental backups on top of what has already been backed up. I don't want to wipe my backup disk for fear that something might go wrong again and I may want to go back to a version earlier than the one I restored. Is there anyway of getting round this problem? It seems like a fairly serious problem.
I would appreciate any help.

ms364 wrote:
I am using a macbook (2010 version) and operating Lion. I had a problem with my Macbook where it wouldn't log on, even in safe mode, so I restored it using Timemachine.
When you erased the disk, it got a new UUID (Universally Unique IDentifier), which is treated like a different drive, and Time Machine will back it up in it's entirety.
Did you do a full system restore, starting from the Recovery HD? If so, that should have left a "trail" so Time Machine should have automatically "associated" the restored disk with the existing backups.
If you did it "piecemeal," though, via the "Star Wars" display, it won't (that doesn't leave the trail for TM to figure out what happened).
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Hi Jeff
Once you have a full back up you can make incremental back ups but you need to follow a set routine. It’s not very intuitive.
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RMAN RECOVERY FROM INCREMENTAL BACKUP

Hi,
hOW TO RECOVER FROM INCREMENTAL BACKUP ?
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Many thanks before.

Thank you,
but I can not connect from RMAN when database is shutdowned.
C:\Documents and Settings\Farid>rman catalog rman/****@reprman target sys/***@bd1
Recovery Manager: Release 10.2.0.1.0 - Production on Ven. FÚvr. 16 18:28:19 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: Úchec de l'initialisation du gestionnaire de rÚcupÚration interne
RMAN-04005: erreur de la base de donnÚes cible :
ORA-12514: TNS : le processus d'Úcoute ne conna¯t pas actuellement le service demandÚ dans le descripteur de connexion
tnsping BD1Adaptateur TNSNAMES utilisÚ pour la rÚsolution de l'alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST
E = bd1.virtualparc.com)))
OK (30 msec)

Fast Incremental Backup

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