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
Drop User Cascade Command Hang On "DLM cross inst call completion" (Doc ID
Bug 31208287 - Deleting Enqueues For A Large Partitioned Table Hangs In
KJCI_WAIT/KJCI_PROCESSCRQ (Doc ID 31208287.8)
Drop in smaller portions. For instance first remove stats/histograms from the
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
From: Noveljic Nenad<mailto:nenad.noveljic@xxxxxxxxxxxx>
Sent: 28 May 2021 08:57
To: Lok P<mailto:loknath.73@xxxxxxxxx>
Cc: ORACLE-L (oracle-l@xxxxxxxxxxxxx)<mailto:oracle-l@xxxxxxxxxxxxx>
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 188.8.131.52.201020.
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.
From: Lok P <loknath.73@xxxxxxxxx>
Sent: Freitag, 28. Mai 2021 06:05
To: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
Cc: ORACLE-L (oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
Subject: Re: Locking issue
Thank you Nenad. We have oracle version 184.108.40.206. 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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