RE: Locking issue

From: Dominic Brooks <dombrooks_at_hotmail.com>
Date: Wed, 9 Jun 2021 15:51:23 +0000
Message-ID: <DB7PR04MB44438C4C3D33DE45739A6E6CA1369_at_DB7PR04MB4443.eurprd04.prod.outlook.com>

Out of interest, but off on a tangent from original thread, I am also hitting what seems to be some oddities around this dc_realtime_colst.

Trying to drop a 230GB partitioned table it’s taking hours with notable waits on DLM cross inst call completion and notable row cache lock waits on dc_realtime_colst (and dc_histogram_defs). For my issue, investigation is pointing towards two notes which point at same bug: Drop User Cascade Command Hang On "DLM cross inst call completion" (Doc ID 2671064.1) Bug 31208287 - Deleting Enqueues For A Large Partitioned Table Hangs In KJCI_WAIT/KJCI_PROCESSCRQ (Doc ID 31208287.8)

WORKAROUND:
Drop in smaller portions. For instance first remove stats/histograms from the columns.

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From: Noveljic Nenad<mailto:nenad.noveljic_at_vontobel.com> Sent: 28 May 2021 08:57
To: Lok P<mailto:loknath.73_at_gmail.com> Cc: ORACLE-L (oracle-l_at_freelists.org)<mailto:oracle-l_at_freelists.org> Subject: RE: Locking issue

Yes, this bug should be fixed in 19.9 in the base release. I can tell from my installation that it’s definitely fixed in 19.9.0.0.201020.

You can verify it for your patch level:

$ORACLE_HOME/OPatch/opatch lsinventory | grep 31414023

We still don’t know the reason for row cache lock id=62/63 allocations. Unfortunately, the 10222 trace doesn’t spool the call stacks for cid=62/63, only for cid=16/8.

We’d need to capture the call stacks for 62 or 63 to find out more.

If you want to go down that rabbit hole, I can prepare a DTrace script if you’re on Solaris or gdb if you’re on Linux. The later would be better to run on a test system if you’re unexperienced with gdb.

Let me know.

Best regards,

Nenad

From: Lok P <loknath.73_at_gmail.com>
Sent: Freitag, 28. Mai 2021 06:05
To: Noveljic Nenad <nenad.noveljic_at_vontobel.com> Cc: ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org> Subject: Re: Locking issue

Thank you Nenad. We have oracle version 19.9.0.0. Need to check patch details. But it seems from the bug details , this bug should have been fixed by this version. correct me if wrong.

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Received on Wed Jun 09 2021 - 17:51:23 CEST