RE: tracing specific sql_id in 12.2

From: Noveljic Nenad <>
Date: Thu, 14 Dec 2017 22:14:47 +0000
Message-ID: <27545_1513289694_5A32F7DE_27545_10625_1_ECDEF0CC6716EC4596FCBC871F48292AB1922FA2_at_ZRH-S231>

You've been having fun :-)

ð Indeed: no bugs – less fun ☺ !

I geeked out a bit and tested this out too on 12.2 ... indeed, seeing the same behavior. Also interesting that when using ALTER SYSTEM to disable that event, it doesn't remove it from the other session (as far as eventdump shows)... so it's telling that even the ALTER command/event propagation doesn't seem to recognize this event being set (correctly) in these secondary sessions.

ð Are you also getting an ORA-0600 or ORA-07445 in some dbgd clean-up function? This would actually confirm a mess-up with the pointers in the linked list.

Thanks for looking at the problem!


Tanel Poder<>

On Thu, Dec 14, 2017 at 6:48 PM, Noveljic Nenad <<>> wrote:

No multitenant, and tested with both new and existing 2. session. Most probably a bug - quite inconvenient.

However, I’ve managed to reconstruct the doubly linked list, where the system events are stored:

linked list ptr to root entry:

BCFFDE18+28: *BCFFDE40 = 989423B8 root_Entry:

989423B8+ 0: *989423B8 = 00000080

989423B8+B8: *98942470 = 96DDD200

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Received on Thu Dec 14 2017 - 23:14:47 CET

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