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!

According to the metalink note 271197.1, the fast incremental feature is not included in the Standard Edition.
As suggested earlier, check the Edition you are working on.
Nicolas.

Similar Messages

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

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?
Regards,
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

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.
SQL> alter database enable block change tracking using file 'block';
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

Block change tracking file error

Hi,
when i selected
"enable block change tracking for faster incremental backups" option under Backup setting policy, and apply it, i get following error
error: "since the database area is not set you must specify a block change tracking file"
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,
Philip.

Hi Anita,
i have 2 more problems which i have explained below.
1. i am running my oracle 10g in linux and after starting the listener, when i try to start the database using
"dbstart" command, i get following error
"Failed to auto-start Oracle Net Listener using /ade/vikrkuma_new/oracle/bin/tnslsnr"
i really have no idea what is this error and how to solve this erorr. Can you please help me. i have also posted a separate forum for this with the heading as
"dbstart" command error
2. my tnsservice name works sometimes and some other times it does not work at all.
at sqlplus prompt when i login as
sys/pwd@orcl as sysdba
sometimes it works fine, other times it gives me error similar to -- protocol could not identify this service name.
Thanks,
Philip.

"block change tracking" equivalent in sql server

Hi All,
If someone has expertise in both oracle and sql server, pls let me know if there is " block change tracking" equivalent in sql server. I know sql server has incremental/differential backup, curious to know whether it got this equivalent feature.
Regards,
Satheesh Shanmugam
http://borndba.com

May be the below link will help you:
http://www.databasejournal.com/features/mssql/article.php/3824196/Introducing-Change-Tracking-in-SQL-Server-2008.htm

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
USING FILE os_file_name;
use this command on the database level. As soon as the file kept the data change tracking, u will speed up ur increamental backups.

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.

Block change Track and ASM

Hi
I have database running 3 node RAC and ASM, current version 10.2.0.4. Since the size is 1T and to minimize the backup time wants to implement BCT. As you know to enable BCT we need to create a file, my question can we create this file in ASM? or it has to out side ASM?
Thanks,

It can be in ASM.

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,
After the restore and recovery, the change tracking file is cleared, and starts recording block changes again. The next incremental backup after any recovery is able to use change-tracking data.
So I guess attempts are made by oracle that file remains in a satisfactory limit.
HTH
Aman....

Ora-00439 enable block change tracing

Hi,
I am attempt to use the feature ENABLE BLOCK CHANGE TRACKING and cannot obtain succefully. When I issue the statement:
sql> alter database enable block change tracking;
I get the error:
ORA-00439 - feature not enable
My estructure is: Red Rat 4 and Oracle 10.2.0.1
Samebody can help me?

I suspect the message means that the feature is only available with the Enterprise Edition. Check the documentation for the standard edition.
If the feature is available with the standard edition then use the full syntax where you specifiy where you want the block change tracking file written to and see if that makes a difference. I believe the default with 10g is to go to the database flashback directory. If you did not configure one then that could be a problem. If you used the full syntax and do have a flashback area but that was not where you tried to place the file I would try defaulting it.
I lean to the feature not being available in your version.
HTH -- Mark D Powell --

Block Change Trackin Performance

Hi,
I'm planning to use incremental backup with Block Change Tracking(BCT) enabled.
Well i see the good points of BCT like reducing network traffic and cpu cycles such that when RMAN checks for datafiles that has changed in block, it will use the BCT file instead of checking the datfile one by one.
Now it cannot yet implemented it because of this question?
"How is the performance hit of BCT?" If there is a block / blocks that are updated / changed, BCT will record it in the file, how much of the resources of the server will be used? Is it too much that it will cause slowness in daily transactions?"
Hope someone will help,
Jay

There will a "small" overhead as per the documentation.
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/bkup004.htm#BRBSC125
<quote>
Change tracking is disabled by default, because it does introduce some minimal performance overhead on your database during normal operations.
<quote>
I also have seen some bugs in 10gR1 related to database hanging issues after enabling BCT but those have been fixed in 10gR2.
All said, you can carry out some testing in your test environment to measure the performance overheads, if any.

Change Tracking has been marked inconsistent after live migration

We run a 3 node Server 2012 R2 cluster and backup using DPM 2012 R2
Everytime a VM is live migrated to another node, when DPM next tries to back it up, the recovery point fails with the "Change Tracking has been marked inconsistent" error and a consistency check needs to be done.
This is fine if one VM is Live Migrated but when we have to put a host in Maintenance mode for some reason and 50 VM's need to be migrated off, it them means 50 consistency checks and our backups go from 2 hours to 8 hours.
Is there a way around this or is this just the way DPM works?
Simon Holman
Expeed Technology
Australian Web Hosting

Hi,
<snip>
please give this on a try: http://support.microsoft.com/kb/2848751
>snip<
Please DO NOT add the forcefixup key - that will make EVERY recovery point use consistency check workflow under the covers - so we basically abandon using the dpmfilter to track block level changes.
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights.

Not able to view actual Price updated 'Value' in Change Tracker

I was able to get my Change tracker to work and it is functioning. (SRM 5.0 MDM5.5 )... Configured Portal iViews for change tracker.
If I change a description I can see it in the change tracker application. But if I try and track a Price change it only shows me a date-time and user as to I when the price was changed it doesnu2019t show me the actual value changed, for my audit purposes.
On the portal the change tracker "Field" dropdown shows -> Price Updated. this is what is tracking any change of price.
In MDM Console-> Admin->Change Tracker I am tracking under Catalog Items: Price information, Price Updated, Special search terms, long description.
When I look at the Data manager in the Record Detail, I see u2018Price Updatedu2019 and it only has a Date and time stamp. In this same Record Detail, I see the field Price Information that contains :Lower bound, Purchasing Info record ID, Purchasing Organization, Amount and Currency. Amount-> contains the actual price value. This is what i want to see in the portal iView as Old value and New value....this is what I am unable to view? theres one small step i am not doing...
I am trying to track the actual change in the filed u2018Amountu2019u2026 I have tried to search for it in the Portal iView fields (table, record contains, fields, record)
cheers
alex

Hi Alex,
I would not here comment on change Tracking functionality but can you suggest another workaround to achieve this requirement. If it fits in your requirement you can go ahead with it.
In MDM, Create another field in Main table say Initial Price and for already existing field Amount replace its name with Updated Price in Qualified table Price.
now after this you will see that your by default Updated Price has values as it was your Amount field earlier and Initial Price field as empty. Now for next time, if any record comes using Import Manager then MDM workflow should trigger at Record Import.
This workflow contains following steps.
Start(Checkout)>Assign>Stop(CheckIn)
Assign step should have below expression and assignment:
Price Information.Updated Price
Where I am assuming Price Information is the field in main table which is look up to this qualified table Price.
So in this way you can maintain both existing and updated values of Price and cant then show in your Catalog.
suppose you have already existing record say 1 which has value of Amount as 20.
So that means you have Updated Price as 20 and Initial Price as empty(Null)
Now when same record 1 updates with new Amount say 40, it triggers this workflow on record import which will then assign value of existing updated Price 20 to Initial Field after that Updated Price will update by 40.
Note: This Assignment works well only if your main table record has this Qualified table link as single record. If your main table record contains more than one qualified links then this Assignment would not work fine. So use only if it fits.
Regards,
Mandeep Saini

Issue in change tracking table on subscriber after reinitialization the subscriber

Hi All,
We have enabled change tracking on the subscriber tables and its getting dropped during a reinitialization.we are running an ETL on the subscriber tables basing on change Tracking.Our Initial ETL runs once and incremental ETL runs after that but
after reinitialization i am getting fresh data and my initial ETL has already run.So how can i resolve this issue.Can't renireinitialization be done without disabling the Change Tracking.
Kindly provide your feedback.
Thanks

The article property Action if name is in use correlates to the
@pre_creation_cmd property of
sp_addmergearticle.
[ @pre_creation_cmd= ] 'pre_creation_cmd'
Specifies what the system is to do if the table exists at the subscriber when applying the snapshot.
pre_creation_cmd is nvarchar(10), and can be one of the following values.
Value
Description
none
If the table already exists at the Subscriber, no action is taken.
delete
Issues a delete based on the WHERE clause in the subset filter.
drop (default)
Drops the table before re-creating it. Required to support Microsoft SQL Server Compact Subscribers.
truncate
Truncates the destination table.
Brandon Williams (blog |
linkedin)

Block change tracking

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