How to multiplex the block change tracking file?

Hi,
I have a question to change block tracking feture.
The normal way to enable block change tracking would be:
ALTER DATABASE ENABLE BLOCK CHANGE TRACKING
USING FILE 'mydir/change_track.f'
REUSE;
What if my harddrive is gone?
Is there anyway to define more than one destinitaion like for archive log files?

The difference is... archive log files can contain irreplaceable data.
With Block Change Tracking the data is not irreplaceable , just run full RMAN backup and then regen the file. <- IMHO

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when i selected
"enable block change tracking for faster incremental backups" option under Backup setting policy, and apply it, i get following error
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how can i fix this error.
1. is it better to provide a block change tracking file, if then how do i do it.
else
2.how can i set a database area
Thanks,
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Enable Block Change Tracking in 11gr2

Hi Team,
If my database file system is in ASM..Can I enable blk change tracking in local filesystem?
Or IS it better to do in ASM? Any new features in 11gr2?
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Manohar

Do you plan running DUPLICATE against that DB?
If yes, you should place the Block Change Tracking File in a location that would enable you to effectively deal with this nasty bug:
"Bug 10193846 - RMAN duplicate fails with ORA-19755 when BCT file is not accessible [ID 10193846.8]"
Also, If you plan to use DUPLICATE, you should “name” your Block Change Tracking File, rather than going with the system name.
This advice applied only for 11gR2 versions that are affected by the bug.
Iordan Iotzov
http://iiotzov.wordpress.com/
Edited by: Iordan Iotzov on Oct 2, 2012 7:19 AM

Block change tracking and Backup size

DB Version : 10gRelease
We have a Differential Incremental Backup strategy with Recovery Window retention policy. I haven't enabled BLOCK CHANGE TRACKING. Just would like to know if the backup size of both Level 0 and Level1 backups become smaller by enabling Block Change Tracking. Or is it just Level 1 backups' size which is going to decrease?
Thank you.

An excerpt from Oracle RMAN 11g Backup and Recovery by Robert G. Freeman & Matthew Hart
ISBN: 978-0-07-162861-7
The Block Change Tracking File
By default, when doing an incremental backup, any datafile that has changed in any way will be
backed up. This can make incremental backups take longer and will make them larger. RMAN
offers the ability to just back up changed database blocks. +This can make your incremental+
+database backups much smaller and shorter.+ To enable block change tracking, issue the command
alter database enable block change tracking. The result of this command will be the creation of a
file called the block change tracking file (BCTF).Checkout the word smaller.
Two things:
A. This is not Official oracle documentation ( Oracle press though)
B. This book is about 11g. I don't know if BCTF makes backups smaller in 11G.

RMAN block change tracking doubt

hi guys,
I want to speed up my RMAN incremental backup.So i decide to enable the block change tracking mechanism. How to implement it ? Should i create any file or set any parameters? plz guide me...
Oracle version:10.2.0.1.0
WindowsNT
TIA,

ALTER DATABASE
ENABLE BLOCK CHANGE TRACKING
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use this command on the database level. As soon as the file kept the data change tracking, u will speed up ur increamental backups.

How to enable block change tracking with pfile

Hello
I want to use enable block change tracking (for fast incremental RMAN backup). kindly advice how can i use this parameter using pfile.
Thanks
Krishna

Krishna Agnihotri wrote:
Hello
I want to use enable block change tracking (for fast incremental RMAN backup). kindly advice how can i use this parameter using pfile.
You could have just tried ,
D:\app\aristadba\product\11.2.0\dbhome_1\database>sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Tue Aug 30 10:04:20 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup pfile=initorcl112.ora
ORACLE instance started.
Total System Global Area 263639040 bytes
Fixed Size                  1373964 bytes
Variable Size             213911796 bytes
Database Buffers           41943040 bytes
Redo Buffers                6410240 bytes
Database mounted.
Database opened.
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Database altered.
SQL>Just to show that the file actually gets created,
SQL> alter database enable block change tracking using file 'block';
Database altered.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
D:\app\aristadba\product\11.2.0\dbhome_1\database>dir
Volume in drive D has no label.
Volume Serial Number is A408-F176
Directory of D:\app\aristadba\product\11.2.0\dbhome_1\database
08/30/2011 10:05 AM        11,600,384 BLOCK
05/17/2010 10:45 AM             2,048 hc_orcl112.dat
10/17/2009 01:35 PM             1,015 INITorcl.ORA
08/30/2011 10:01 AM             1,042 INITorcl112.ORA
              12 File(s)     21,412,139 bytes
               3 Dir(s) 17,036,451,840 bytes free
D:\app\aristadba\product\11.2.0\dbhome_1\database>sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Tue Aug 30 10:06:40 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> alter database disable block change tracking;
Database altered.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
D:\app\aristadba\product\11.2.0\dbhome_1\database>dir
Volume in drive D has no label.
Volume Serial Number is A408-F176
Directory of D:\app\aristadba\product\11.2.0\dbhome_1\database
08/30/2011 10:06 AM    <DIR>          .
08/30/2011 10:06 AM    <DIR>          ..
05/17/2010 08:55 AM    <DIR>          archive
05/17/2010 10:45 AM             2,048 hc_orcl112.dat
10/17/2009 01:35 PM             1,015 INITorcl.ORA
08/30/2011 10:01 AM             1,042 INITorcl112.ORA
12/22/2005 04:07 AM            31,744 oradba.exe
08/30/2011 09:05 AM             9,314 oradim.log
12/24/2009 08:09 PM             1,536 PWDorcl.ora
08/07/2011 11:00 PM             1,536 PWDorcl112.ora
04/15/2011 05:52 PM         9,748,480 SNCFORCL112.ORA
02/10/2011 09:00 PM             3,584 SPFILEORCL.ORA
08/30/2011 09:59 AM             3,584 SPFILEORCL112.ORA
02/10/2011 09:07 PM             7,872 upgrade.logAman....
Edited by: Aman.... on Aug 30, 2011 10:08 AM added 2nd code snippet

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Change tracking file

Hello,
When I enable block change tracking, is it any method to maintain this file? Do we delete and recreate it in any way? Or we just let it stay and grow automatically?
Thx for help,
Aliq

Hi,
From the docs,
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/bkup004.htm#sthref424
The file is an Oracle Managed file and hence means that it does'nt require any management for the dba side.
Do we delete and recreate it in any way?
Once disabled, we can overwrite teh file with the Reuse option and use it again if we see its increasing enormously.
Also from teh docs again,
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Block change tracking

Hello,
I have a Oracle 10.1.0.5.0 on Windows 2003. My need to enable block change tracking. So I login SQL PLUS as sysdba:
SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE
'HOME/DB_INSTANCE/BLOCK_CHANGE.TRC';
ALTER DATABASE ENABLE
ERROR at line 1:
ORA-00439: feature not enabled: Block Change Tracking.
I have read some documentations and this is command I should use. Please help me where I can enable this feature.
Many thanks!

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http://borndba.com

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How to multiplex the block change tracking file?

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