How to find the details of the session of hexadecimal value 11g RAC deadlock
Hello
Version: 11.2.0.4 2 node RAC on AIX 7.1
We place worldwide in our database, and we can see in the file path as:
Submit application dump asynchronized [1 c]. Summary = [clear stack process GHG (kjdglblkrdm1)].
Global end dump blockers: -.
Wait-For-Graph (WFG) overall to DDT [0.2d7]:
BLOCKED 0x700010448e88a48 wq 4 2 cvtops x 1 TM 0x1a3b3.0x0 (ext 0 x 0 0 x 0) [100 a-00AB-00000093] inst 1
TRAINER 4 wq 0x70001043b5ffd50 2 cvtops x 1 TM 0x1a3b3.0x0 (ext 0 x 0 0 x 0) [200F-00F8-00000014] inst 2
0x70001043b5ffd50 wq 4 2 cvtops x 1 TM 0x1a3b3.0x0 (ext 0 x 0 0 x 0) BLOCKED [200F-00F8-00000014] inst 2
TRAINER 4 wq 0x700010448e88a48 2 cvtops x 1 TM 0x1a3b3.0x0 (ext 0 x 0 0 x 0) [100 a-00AB-00000093] inst 1
So, here, the session had lock mode 4 on the 0x1a3b3 object. What is "wq 2 ' above the info? What are the 100 a-00AB-00000093 and 200F-00F8-00000014 indicates the above data of the WFG?.
I want to see the details of each session of 0x700010448e88a48, 0x70001043b5ffd50 sessions and how can I get this info from the history views$ v?
Thank you very much
Kind regards
'4' is actually the 5 lock mode.
See https://orastory.wordpress.com/2011/11/23/wfg-mode-5-tm-deadlock/
You can also use the raw data of ASH in V$ ACTIVE_SESSION_HISTORY and/or DBA_HIST_ACTIVE_SESS_HISTORY to complete.
It will tell you which statement was the blocked session running and blocking the session details (but not which statement was responsible for blocking, unless you get very lucky).
However, your scenario of lock mode 5 TM could match the scenario of blocking foreign key non-indexed in the article above.
The TM, the 0x1a3b3 lock can be translated into decimal - 107443 - and used to match the object of dba_objects.object_id
#define KJUSERNL 0 /* no permissions */ (Null)
#define KJUSERCR 1 /* concurrent read */ (Row-S (SS))
#define KJUSERCW 2 /* concurrent write */ (Row-X (SX))
#define KJUSERPR 3 /* protected read */ (Share)
#define KJUSERPW 4 /* protected write */ (S/Row-X (SSX))
#define KJUSEREX 5 /* exclusive access */ (Exclusive)
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