Hello Patrice,
does the Oracle software know that five instances are running from the same
home?
Patrice sur GMail <patrice.boivin@xxxxxxxxx> hat am 23. November 2018 um--
14:53 geschrieben:
Hi,
a possibly dumb question:
If you have a hard partition with 2 cores but 8 threads total but are running
five Oracle instances within that hard partition, does the Oracle software
know that five instances are running from the same home? Or is each instance
oblivious to the fact that it is sharing resources with other instances.
I ask because if we set cpu_count=8 in each of five instances, doesn't that
mean the instances expect the hard partition to provide a total of 40 threads?
If they are aware of their environment then each instance could say "well
obviously they are lying to me, I only really have 8/5 threads available to
me, though we are sharing resources so sometimes I will have more time
slices, other times, not as many."
Overloading may not cause major problems other than each instance not getting
as many time slices as it expects, i.e. each one would end up running slower
than optimal. (reminds me of when I was a student working on an overloaded
mainframe which had more dumb terminals than recommended, each dumb terminal
had to wait for time slices) Meanwhile there would be nearly no wasted time
slices because the CPUs are very busy.
-- Patrice
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