Re: Effective compression ratio with minimal performance overhead
From: Mladen Gogala <gogala.mladen_at_gmail.com>
Date: Mon, 23 May 2022 08:05:22 -0400
Message-ID: <df741f2d-7f94-8926-7c57-8e29dc8548df_at_gmail.com>
Date: Mon, 23 May 2022 08:05:22 -0400
Message-ID: <df741f2d-7f94-8926-7c57-8e29dc8548df_at_gmail.com>
On 5/23/22 07:43, Jonathan Lewis wrote:
>
> _at_Mladen Gogala <mailto:gogala.mladen_at_gmail.com>
>
> When did that change; I haven't been watching closely but the
> compression used to be done at the compute node, and HC decompression
> at storage cells, through software, except for the cases where the
> storage cell sent the CU to the compute node either to balance the CPU
> usage or because the extract from a smart scan was too large for the
> message buffer.
>
> Regards
> Jonathan Lewis
Hi Jonathan,
I think that I've read in some white paper that HCC is done on storage nodes, transparently to the compute nodes, as of X7. I'll look for the paper and let you know.
Regards
-- Mladen Gogala Database Consultant Tel: (347) 321-1217 https://dbwhisperer.wordpress.com -- http://www.freelists.org/webpage/oracle-lReceived on Mon May 23 2022 - 14:05:22 CEST