Comments on: _gc_fusion_compression

By: Log Buffer #270, A Carnival of the Vanities for DBAs

Log Buffer #270, A Carnival of the Vanities for DBAs — Wed, 13 Feb 2013 17:02:00 +0000

[...] it comes to RAC internals, Riyaj Shamsudeen‘s name comes to the mind. He has produced another [...]

By: baskar

baskar — Tue, 29 May 2012 02:55:13 +0000

Thanks a lot for sharing the analysis.

By: Paresh

Paresh — Thu, 10 May 2012 16:37:14 +0000

Thanks! I got my answer after I watched your deep dive video on LMS.

By: Riyaj Shamsudeen

Riyaj Shamsudeen — Thu, 10 May 2012 15:36:01 +0000

I will cover this in my next blog entry soon , as I had many offline questions about the method.

Short answer is wireshark.

By: Paresh

Paresh — Thu, 10 May 2012 05:55:14 +0000

Riyaj,

Thanks for sharing this analysis. It would be great if you can share how do you find transferred bytes of a given block?

Thanks,
Paresh

By: Riyaj Shamsudeen

Riyaj Shamsudeen — Mon, 30 Apr 2012 18:10:18 +0000

Vishal
Thank you for checking the parameter in other versions.
Cheers
Riyaj

By: Vishal Gupta

Vishal Gupta — Mon, 30 Apr 2012 16:02:05 +0000

_gc_fusion_compression parameter was introduced in 11.2.0.1, so i guess optimization might have been introduced in 11.2.0.1 onwards. Its default value in 11.2.0.1 is 1536. In 11.2.0.[2-3], its default value is 1024.

By: _gc_fusion_compression » Peasland Database Blog

_gc_fusion_compression » Peasland Database Blog — Mon, 30 Apr 2012 13:37:31 +0000

[...] http://orainternals.wordpress.com/2012/04/29/_gc_fusion_compression/ [...]

By: Brian Peasland

Brian Peasland — Mon, 30 Apr 2012 13:34:27 +0000

Very cool analysis! Thanks for the info!