RE: How to simulate latch: cache buffers chains and latch: row cache objects

From: Noveljic Nenad <nenad.noveljic_at_vontobel.com>
Date: Tue, 27 Aug 2019 05:00:03 +0000
Message-ID: <20567_1566882011_5D64B8DB_20567_13186_1_da165a757a854215a7018ed0954f7665_at_vontobel.com>



To reproduce a latch at will and hold it for deterministic time period I would set the breakpoint with gdb on a function participating in latch allocation.

To get an idea which functions that might be I’d gather stack traces when the latch event gets written into the 10046 trace files. This is something that can be accomplished with either DTrace or gdb. I described the method with DTrace here: https://nenadnoveljic.com/blog/enriching-trace-with-call-stacks/

Best regards,

Nenad

_at_NenadNoveljic

From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of kunwar singh Sent: Montag, 26. August 2019 22:40
To: ORACLE-L <oracle-l_at_freelists.org> Subject: How to simulate latch: cache buffers chains and latch: row cache objects

Hi Listers,
Just an academic question.

I am trying to learn about these wait events in detail. Can you please share what how i can reproduce it on a 12.2 or higher DB

i have a test machine with 24 cores and 12.2 DB running on it.

--
Cheers,
Kunwar



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Received on Tue Aug 27 2019 - 07:00:03 CEST

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