I just noticed I forgot to mention the version: 22.214.171.124
În joi, 17 iun. 2021 la 14:35, Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
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
*From:* oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> *On
Behalf Of *Jonathan Lewis
*Sent:* Donnerstag, 17. Juni 2021 12:41
*To:* ORACLE-L (oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
*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
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.
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