Re: Effective compression ratio with minimal performance overhead

_at_Mladen Gogala <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

On Mon, 23 May 2022 at 12:29, Mladen Gogala <gogala.mladen_at_gmail.com> wrote:

> H Lok,
> HCC is done on Exadata storage nodes, and is implemented in hardware. You
> don't see any overhead on the database side but that doesn't mean thee
> isn't any.
> Regards
>
>

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