According to the 10222 trace, the following procedures are called when the row
cache locks id=62/63 are being allocated:
kqrInstanceLock
kqrClusterLock
kqrGetClusterLock
kqrReadFromDB
The circumstances described in the MOS document Job Hangs After Upgrade 19.7
with Row Cache Lock Issue by Jnnn Process (Doc ID 2714660.1) might match your
problem. The call stack is similar:
ksedsts<-ksdxfstk<-ksdxcb<-sspuse<-__sighandler<-semtimedop<-skgpwwait<-ksliwat<-kslwaitctx<-kjusuc
<-ksipgetctxia<-ksixpgetia<-kqrInstanceLock<-kqrGetClusterLock<-kqrLockPo<-kqrpre2()+1043<-kqrpre1
The document points to the following bugs:
Bug 31547552 : DBMS_SCHEDULER JOB CREATION IS BLOCKED BY ROW CACHE LOCK
0X8/0X5/0X3: CAUSING COMPLETE OUTAGE
[https://support.oracle.com/epmos/adf/images/t.gif]
Bug 31414023 - ORA-00700 [kqrFreePOMutex] Error Occurs When Trying to Free a
Mutex Following Another Internal Error (Doc ID 31414023.8)
Affected Versions are > 19.7
Bug is fixed in following:
19.8.0.0.200714 (Jul 2020) Database Release Update (DB RU)
19.7.1.0.200714 (JUL 2020) DB Release Update Revision(DB RUR)
Or there’s a one-off.
What’s your release/patch level?
Best regards,
Nenad
From: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> On Behalf
Of Noveljic Nenad
Sent: Donnerstag, 27. Mai 2021 15:10
To: Lok P <loknath.73@xxxxxxxxx>; ORACLE-L (oracle-l@xxxxxxxxxxxxx)
<oracle-l@xxxxxxxxxxxxx>
Subject: RE: Locking issue
P.S. In other to narrow down the column which causes the problem, could you
turn on the SQL trace with bind variables? We ‘re interested in the intcol#=:2
value and olso to verify if obj#=:1 is for the user tabke.
From: Noveljic Nenad
Sent: Donnerstag, 27. Mai 2021 14:56
To: 'Lok P' <loknath.73@xxxxxxxxx<mailto:loknath.73@xxxxxxxxx>>; ORACLE-L
(oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>)
<oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Subject: RE: Locking issue
As it looks like, the compilation of “select * on user tables” executes
recursively:
select timestamp#, sample_size, minimum, maximum, lowval, hival, null_cnt,
avgcln, spare1, spare2 from wri$_optstat_histhead_history where obj#=:1 and
intcol#=:2 and savtime = timestamp '4000-12-01 01:00:00 -0:0'
I don’t see why the statistics history was needed in this case.
The timestamp '4000-12-01 01:00:00 -0:0' is peculiar.
The row cache 62 was allocated before executing the recursive query.
Best regards,
Nenad
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