Comments on: Does Oracle’s Block Change Tracking File Shrink? http://www.pythian.com/news/1163/does-oracle-block-change-tracking-file-shrink/ News and views from Pythian DBAs Fri, 10 Feb 2012 13:01:25 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: Alex Gorbachev http://www.pythian.com/news/1163/does-oracle-block-change-tracking-file-shrink/#comment-285526 Alex Gorbachev Fri, 03 Oct 2008 06:27:04 +0000 http://www.pythian.com/blogs/1163/does-oracle-block-change-tracking-file-shrink#comment-285526 As I recall (and my memory is not too good for such details...), the space in the BCT file is not allocated immediately but rather "on demand". I.e. when you take *incremental* backups and space for the new bitmaps is needed. After datafile has been backed up 8 time, the space is allocated and then reused after bitmaps are aged out. I might have oversimplified it but this is as far as I could see. Again, this might not be true - just the result of my observation. As I recall (and my memory is not too good for such details…), the space in the BCT file is not allocated immediately but rather “on demand”. I.e. when you take *incremental* backups and space for the new bitmaps is needed. After datafile has been backed up 8 time, the space is allocated and then reused after bitmaps are aged out.

I might have oversimplified it but this is as far as I could see. Again, this might not be true – just the result of my observation.

]]> By: Does Oracle’s Block Change Tracking File Shrink? « die Seilerwerks http://www.pythian.com/news/1163/does-oracle-block-change-tracking-file-shrink/#comment-284920 Does Oracle’s Block Change Tracking File Shrink? « die Seilerwerks Thu, 02 Oct 2008 04:10:44 +0000 http://www.pythian.com/blogs/1163/does-oracle-block-change-tracking-file-shrink#comment-284920 [...] leave a comment » Reposted from The Pythian Group blog. [...] [...] leave a comment » Reposted from The Pythian Group blog. [...]

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