Home -> Mailing Lists -> Oracle-L -> RE: Locking issue

RE: Locking issue

From: Noveljic Nenad <nenad.noveljic_at_vontobel.com>
Date: Thu, 27 May 2021 14:05:45 +0000
Message-ID: <6b1c2cdeadb54e45bd22498454e51886_at_vontobel.com> 













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_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Noveljic Nenad
Sent: Donnerstag, 27. Mai 2021 15:10


To: Lok P <loknath.73_at_gmail.com>; ORACLE-L (oracle-l_at_freelists.org) <oracle-l_at_freelists.org>
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_at_gmail.com<mailto:loknath.73_at_gmail.com>>; ORACLE-L (oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>) <oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>>
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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Please note that all e-mail communications to and from the Vontobel Group are subject to electronic storage and review by Vontobel Group. Unless stated to the contrary and without prejudice to any contractual agreements between you and Vontobel Group which shall prevail in any case, e-mail-communication is for informational purposes only and is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction.
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Received on Thu May 27 2021 - 16:05:45 CEST












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