Re: HCC in Pillar Storage

From: Marcin Przepiorowski <pioro1_at_gmail.com>
Date: Tue, 20 Mar 2012 13:27:09 +0000
Message-ID: <CAGdek=wa_C7MyeKyTKeHOGhN23Bg9N1bNN-C6DcXESgBhWbJJA_at_mail.gmail.com>

On Tue, Mar 20, 2012 at 12:55 PM, Ls Cheng <exriscer_at_gmail.com> wrote:
> Hi
>
> Probably you are hitting Bug 13362079 - HCC compression should not be
> allowed on dNFS with non ZFS or Pillar?

Hmmm - yes this is bug ;)

>
> I am wondering because I am not very sure where is HCC done, if it is done
> in the DB how the hcc algorithm applies for some blocks (pillar) and some
> not (EVA), if it works shouldnt be a performance hit?
>

As far as I know HCC compression is done by DB but I have think / tested what is a performance hit.
Hope some Exadata experts will give you more details.

regards,

-- 
Marcin Przepiorowski
http://oracleprof.blogspot.com
--
http://www.freelists.org/webpage/oracle-l

Received on Tue Mar 20 2012 - 08:27:09 CDT