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Memory pressure on Cloud at customer solution with EXADATA

From: Jack van Zanen <jack_at_vanzanen.com>
Date: Tue, 21 May 2019 09:53:20 +1000
Message-ID: <CAFeFPA8Pecjv7K2Qd4TV+KdWGZHSJonoU62LGSo2tb8nGa4YAg_at_mail.gmail.com> 





Hi All,



Oracle 12.2.0.1


PSU Jan 2019


Kernel version: 4.1.12-124.24.3.el6uek.x86_64 #2 SMP Mon Jan 14 15:08:09
PST 2019 x86_64



we have a 2 node RAC/Exadata solution and have configured about 500GB of
720GB memory for Huge Pages.


Now this is over configured at the moment as we have decommissioned  some
databases. This is our combined TEST/DR environment and we could spin up
more containers at any time.



Last week we had node 1 crash and oracle support came back saying it was
due to memory pressure and we need to configure fewer Huge Pages.



While in theory that makes sense but I am struggling to understand why a
system with 200G+ memory not allocated to huge pages is crashing due to
memory issues. I have checked our alert logs and the databases start using
huge pages.



Anyone here can explain to me how this can happen, as oracle support keep
repeating to lower the configured huge pages.





Jack van Zanen






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Received on Tue May 21 2019 - 01:53:20 CEST












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