Re: expdp - cell single block physical read/ read request

Do you have any indication that you're dealing with chained rows? expdp would have to follow chained rows across blocks, doing single block reads. I'm not sure if your version would do the same with migrated rows, but it might if it follows the code path used by parallel tablescans.

Regards
Jonathan Lewis

On Thu, 16 Dec 2021 at 03:02, Jack van Zanen <jack_at_vanzanen.com> wrote:

> Hi
>
>
> Oracle 12.2.0.1 Exadata
>
> I am running a datapump and two of the workers are spending a lot of time
> on
> - cell single block physical read
> - cell single block read request
>
> This does not make sense to me as it is full expdp I would expected a full
> table scan type of wait, not single block
>
> I checked mos but my search did not find anything related to my version
>
> Does anyone know of any reason why this might happen?
>
>
>
> Jack van Zanen
>
>
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