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.

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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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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
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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
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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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I have a question to change block tracking feture.
The normal way to enable block change tracking would be:
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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.
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"block change tracking" equivalent in sql server

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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:
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RMAN block change tracking doubt

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ALTER DATABASE
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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.

Block change tracking

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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:
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S.
// it takes almost no time to rate an answer
Attachments:
DynamicPropertyLoader.seq ‏32 KB

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>
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Hi there,
I've got multiples questions about JMF and AvTransmit, hope you will help
For a small student project, i'm developing a streaming server using JMF, i have used the AvTransmit example.
Streaming, etc... everything work fine, i stream music over web
But i need help with "playlist" :
// Get the tracks from the processor
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First Question :
The Processor use a MediaLocator to get one track, is there a way to indicate multiples tracks, such as a directory containing multiples audio file ?
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I'm using a simple class as Playlist (a File[]), and, when i want to change song, i stop the thread, change the MediaLocator with another file, and restart the thread.
It works on a Lan, but on Internet, Player (I use VLC for my test) lost the connection, i need to restart VLC to get audio again.
Second Question
Is there a more "elegant" way to change tracks ?
Last Question
I have think about building my own object Playlist... gasp...
I've look at the javadoc... but i'm a bit lost... does my class have to implement TrackControl ? what are the object inside etc...
If someone knows information about this...
That's all ;)
Thanks !
Tommy, french student (sorry for the english)

First Question :
The Processor use a MediaLocator to get one track, is there a way to indicate multiples tracks, such as a directory containing multiples audio file ?
At this time, i can only set 1 file in the MediaLocator.No. The processor uses a MediaLocator to get one file. Files (can) contain multiple tracks.
You can, in fact, combine the tracks of multiple files together, but, there's no need to do that with your application. AVTransmit2 sends each track as a separate RTP stream, so you'd just be sticking them together just to pull them apart again.
In general, you want to keep your architecture as one processor per file, one RTP stream per track.
Second Question
Is there a more "elegant" way to change tracks ?Yes. It's what I refer to as a jukebox DataSource. I discuss it / explain the concept on this previous thread.
[http://forums.sun.com/thread.jspa?forumID=28&threadID=5400318]
What you're essentially doing when you change the MediaLocator is starting over from scratch. You end up with a whole new DataSource, whole new Processor, whole new RTP session. On the LAN, this isn't an issue because it looks like you paused the RTP session (because the IP/PORTs don't change).
Over the internet, though, when you stop sending and restart, you're very likely going to get a new public NAT port. And so when your stream gets to the client, it's going to look like it's from a different person than the original.
The solution is to use the jukebox datasource to change the media without restarting the Processor or the RTP streams. That'll ensure that your stream won't move between files from the perspective of the client...
Last Question
I have think about building my own object Playlist... gasp...
I've look at the javadoc... but i'm a bit lost... does my class have to implement TrackControl ? what are the object inside etc...
If someone knows information about this...Ummmm, your "Playlist" object should just be a Jukebox datasource, so follow the link and figure out how that's supposed to work. If you have questions about it, just ask 'em here (rather than on the older thread)...

Block change tracking and Backup size

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