Re: latch-free SCN scheme (10.1.0.3)
- From: Nicolai Tufar <ntufar@xxxxxxxxx>
- To: tanel.poder.003@xxxxxxx
- Date: Wed, 16 Feb 2005 10:56:51 +0200
On Wed, 16 Feb 2005 00:56:05 -0000, Tanel P=F5der <tanel.poder.003@xxxxxxx>=
wrote:
> Btw, this description of zero-copy redo is just my untested guess, based =
on
> few parameter names, latch statistics and background information. Even
> though operating systems do use such VM page remapping tricks for (like s=
ome
> TCP stack implementations) for performance reasons - Oracle might not do
> it - zero copy might also mean that redo records are directly constructed=
to
> private strand areas and written to disk directly from there by logwr, as
> opposed to creating these in PGA and copying to logbuffer then...
VM page remapping is not possible for a user
process. I speak for Solaris and Linux. Other OSes may
allow it though. Anyways, since Oracle is largely UNIX-
oriented, your second scenario is more likely.
> Tanel.
Nicolai
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