RE: Deadlock inserting into same rowid (different block)

From: Patterson, Joel <jpatterson_at_entint.com>
Date: Thu, 11 Apr 2013 12:00:40 -0400
Message-ID: <C1117B1AA0340645894671E09A7891F714F8F4A959_at_EIHQEXVM2.ei.local>

Hello Jonathan,
I had created an SR on this issue, which is about to run its course. In midst of it I asked if the slot #'s being zero is expected behavior in this situation. The response was why would it not be expected -- we start the number with 0,1,2 ... etc. It is the slot on the ITL it is waiting for. Is there some elaboration which would help me discuss it further? I plan to close out the SR as it has basically run its course at this point and the problem was identified and fixed - and I believe the forum was updated as well. Essentially two batch jobs running at the same time, however I wanted to explore this before I close taking advantage of the fact that the SR is open already. Best Regards,

2013/3/20 Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk<mailto:jonathan_at_jlcomp.demon.co.uk>>

The deadlock pattern is indicative of collisions on a unique constraint. They're both trying to insert primary / unique key values already inserted but not yet committed by the other session.

Given that the slot numbers are both zero, it's likely that they're being reported incorrectly - Oracle doesn't clean out the wait information for every single wait, so these could be the file and block (with zero row) for early buffer busy waits, or read by other session or some such.

Regards

Jonathan Lewis
http://jonathanlewis.wordpress.com/all-postings

Author: Oracle Core (Apress 2011)
http://www.apress.com/9781430239543

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From: "Patterson, Joel" <jpatterson_at_entint.com<mailto:jpatterson_at_entint.com>>



|

| Deadlock graph:

|                       ---------Blocker(s)--------  ---------Waiter(s)---------

| Resource Name          process session holds waits  process session holds

waits


| TX-001a0015-00014787        34      90     X             32       3

S


| TX-00190008-0000601b        32       3     X             34      90

S


|

| session 90: DID 0001-0022-00000327      session 3: DID 0001-0020-000009E9

| session 3: DID 0001-0020-000009E9       session 90: DID

0001-0022-00000327


|

| Rows waited on:

|  Session 90: obj - rowid = 00030CE5 - AAAwzlAAGAABDiuAAA

|  (dictionary objn - 199909, file - 6, block - 276654, slot - 0)

|  Session 3: obj - rowid = 00030CE5 - AAAwzlAAGAABp8gAAA

|  (dictionary objn - 199909, file - 6, block - 433952, slot - 0)

|

|

|


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Received on Thu Apr 11 2013 - 18:00:40 CEST