RE: MMAN blocker
Date: Thu, 25 Jul 2019 11:50:34 +0000
Message-ID: <5734_1564055443_5D399793_5734_1088_1_29390e7043644b00a61d54eba19e1448_at_vontobel.com>
"Having said that, this looks like a serious bug in whatever version you're using."
ð The affected version is 12.2.0.1.171017.
"SGA component growth operation has higher priority than sessions allocating memory and sessions have to wait"
ð That sounds plausible. However, since MMAN seemed idle I'm speculating that something in the inter-process communication might have wrong, so the sessions "thought" that the resizing operation was still going on.
"Session doesn't make that decision."
ð My understanding is that memory allocations are done by sessions themselves by calling kgha* functions. So I assume - but I might be wrong here - that some of those functions are checking for on-going resizing operations. I'd like to know precisely which mechanism is used for coordinating this interaction. I mean something like latch, mutex, pin, message etc. In fact, understanding these internals was the main motivation for posting this problem.
"Please call support"
ð I'd like to better understand and possibly reproduce the problem first.
Best regards,
Nenad
https://nenadnoveljic.com/blog/
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-- http://www.freelists.org/webpage/oracle-lReceived on Thu Jul 25 2019 - 13:50:34 CEST