Re: tablespace autoextend on next size not obeyed

I just noticed I forgot to mention the version: 12.1.0.2

În joi, 17 iun. 2021 la 14:35, Noveljic Nenad <nenad.noveljic_at_vontobel.com> a scris:

> We observed something similar after patching. A bunch of wxxx processes
> generated huge load to reclaim the space used by deleted LOBs.
>
>
>
> The default of _max_spacebg_slaves was huge - 1000 (?!), and we reduced it
> to 10.
>
>
>
> Best regards,
>
> Nenad
>
>
>
> *From:* oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> *On
> Behalf Of *Jonathan Lewis
> *Sent:* Donnerstag, 17. Juni 2021 12:41
> *To:* ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
> *Subject:* Re: tablespace autoextend on next size not obeyed
>
>
>
> Are these all bigfile tablespaces, do all the files have
> dba_data_files.increment_by set explicitly to 10g (i.e. 1,310,720 if you're
> using 8KB blocks).
>
> Is the parameter "_enable_extent_preallocation" set to 3 on production and
> standby.
>
> Do the two systems have significantly different numbers of CPUs - which
> could affect the number of Wnnn processes.
>
> Do you get any clues about the small allocations being handled by
> foreground processes while the large ones are handled by Wnnn?
>
>
>
> I can't explain why you're seeing the effect, but I could imagine that
> even a 10G (unit) allocation being shared out in units of 64MB across
> multiple Wnnn processes thanks to some algorithm that was checking
> concurrency, load, and CPU usage.
>
>
>
> Regards
>
> Jonathan Lewis
>
>
>
>
>
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