Transaction recovery: lock conflict caught and ignored

ALERT.LOG:

..... Transaction recovery: lock conflict caught and ignored
.....

And also some incident files are being created in $ORACLE_BASE/diag/rdbms/dbname/instancename/incident folder.

In my case the error started after SUPPLEMENTAL LOGGING enabled in a RAC environment. After disabling it the messages have not disappeared, but incident files are no longer being created.

1. Dead Trasaction

SQL> select b.name useg, b.inst# instid, b.status$ status, a.ktuxeusn

xid_usn, a.ktuxeslt xid_slot, a.ktuxesqn xid_seq, a.ktuxesiz undoblocks,

a.ktuxesta txstatus

from x$ktuxe a, undo$ b

where a.ktuxecfl like ‘%DEAD%’

and a.ktuxeusn = b.us#;

USEG INSTID STATUS XID_USN XID_SLOT XID_SEQ UNDOBLOCKS TXSTATUS
_SYSSMU7_881277423$ 1 3 7 13 1829999 1 ACTIVE
_SYSSMU8_4204495590$ 1 3 8 32 3045564 1 ACTIVE
_SYSSMU10_1314081219$ 1 3 10 3 11844457 1 ACTIVE

Transaction id is  XID_USN.XID_SLOT.XID_SEQ

So in our case, for the first row it will be 7.13.1829999

2.  Read transaction table from undo header.

ALTER SYSTEM DUMP UNDO HEADER ‘_SYSSMU7_881277423$’;

….

  TRN TBL::

 
  index  state cflags  wrap#    uel         scn            dba            parent-xid    nub     stmt_num    cmt

  ————————————————————————————————

   0x00    9    0x03  0x1bf45c  0x000b  0x0000.789de808  0x00c242eb  0x0000.000.00000000  0x00000001   0x00c242eb  1367258143

   0x01    9    0x00  0x1c031b  0x0014  0x0000.789e6018  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258225

   0x02    9    0x00  0x1c147a  0x000e  0x0000.789e694b  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258230

   0x03    9    0x00  0x1c06f9  0x0016  0x0000.789e601c  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258225

   0x04    9    0x00  0x1c06c8  0x0009  0x0000.789e3566  0x00c242f9  0x0000.000.00000000  0x00000001   0x00000000  1367258192

   0x05    9    0x00  0x1c1167  0x0015  0x0000.789e357f  0x00c242ec  0x0000.000.00000000  0x00000001   0x00000000  1367258192

   0x06    9    0x00  0x1c2716  0x0017  0x0000.789e69e1  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258230

   0x07    9    0x00  0x1c1045  0x000c  0x0000.789e1bdb  0x00c242eb  0x0000.000.00000000  0x00000001   0x00000000  1367258170

   0x08    9    0x00  0x1c2614  0x0005  0x0000.789e357e  0x00c242ec  0x0000.000.00000000  0x00000001   0x00000000  1367258192

   0x09    9    0x00  0x1bfa03  0x0021  0x0000.789e3574  0x00c242f9  0x0000.000.00000000  0x00000001   0x00000000  1367258192

   0x0a    9    0x00  0x1bf712  0x001e  0x0000.789e3246  0x00c242f1  0x0000.000.00000000  0x00000001   0x00000000  1367258190

   0x0b    9    0x00  0x1c1e01  0x0007  0x0000.789e1bd9  0x00c242eb  0x0000.000.00000000  0x00000001   0x00000000  1367258170

   0x0c    9    0x00  0x1c08e0  0x000a  0x0000.789e3244  0x00c242f1  0x0000.000.00000000  0x00000006   0x00000000  1367258190

   0x0d   10    0x90  0x1bec6f  0x0038  0x0000.789e783e  0x00c242fb  0x0000.000.00000000  0x00000001   0x00c242fb  0

   0x0e    9    0x00  0x1c068e  0x0010  0x0000.789e694d  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258230

   0x0f    9    0x00  0x1c151d  0x0012  0x0000.789e3578  0x00c242ec  0x0000.000.00000000  0x00000001   0x00000000  1367258192

   0x10    9    0x00  0x1c26bc  0x0006  0x0000.789e69df  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258230

   0x11    9    0x00  0x1c16eb  0x0000  0x0000.789cbd77  0x00c242eb  0x0000.000.00000000  0x00000001   0x00000000  1367257923

   0x12    9    0x00  0x1c082a  0x001d  0x0000.789e357c  0x00c242ec  0x0000.000.00000000  0x00000001   0x00000000  1367258192

   0x13    9    0x00  0x1c1459  0x001f  0x0000.789e7891  0x00c242fc  0x0000.000.00000000  0x00000001   0x00000000  1367258238

   0x14    9    0x00  0x1c14b8  0x0003  0x0000.789e601a  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258225

   0x15    9    0x00  0x1c0457  0x0020  0x0000.789e39d3  0x00c242ec  0x0000.000.00000000  0x00000001   0x00000000  1367258195

   0x16    9    0x00  0x1c1326  0x0002  0x0000.789e601d  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258225

   0x17    9    0x00  0x1c0db5  0x001c  0x0000.789e788a  0x00c242fc  0x0000.000.00000000  0x00000001   0x00000000  1367258238

   0x18    9    0x00  0x1bffe4  0x001b  0x0000.789e400d  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258200

   0x19    9    0x00  0x1c16e3  0x0001  0x0000.789e5fd2  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258225

   0x1a    9    0x00  0x1bdbb2  0x0018  0x0000.789e400b  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258200

   0x1b    9    0x00  0x1c1141  0x0019  0x0000.789e453a  0x00c242fa  0x0000.000.00000000  0x00000001   0x00000000  1367258204

   0x1c    9    0x00  0x1bc9a0  0x0013  0x0000.789e788e  0x00c242fc  0x0000.000.00000000  0x00000001   0x00000000  1367258238

   0x1d    9    0x00  0x1c02ef  0x0008  0x0000.789e357d  0x00c242ec  0x0000.000.00000000  0x00000001   0x00000000  1367258192

   0x1e    9    0x00  0x1c0b6e  0x0004  0x0000.789e3250  0x00c242f9  0x0000.000.00000000  0x00000009   0x00000000  1367258190

   0x1f    9    0x00  0x1c00ad  0xffff  0x0000.789e78a1  0x00c242fc  0x0000.000.00000000  0x00000001   0x00000000  1367258238

   0x20    9    0x00  0x1c166c  0x001a  0x0000.789e39dd  0x00c242fa  0x0000.000.00000000  0x00000002   0x00000000  1367258195

   0x21    9    0x00  0x1c160b  0x000f  0x0000.789e3576  0x00c242ec  0x0000.000.00000000  0x00000001   0x00000000  1367258192

  EXT TRN CTL::

  usn: 7

 
State# 10 means active transaction.

dba points to starting UNDO block address.

usn: Undo segment number

usn.index.wrap# gives transaction id.

 
An active transaction 0x0007.00d.001bec6f is available in slot 0x0d which has a dba of 0x00c242fb (12731131 in decimal)

3. Reading UNDO Block:

Identify fileID and blockID:

fileID:

select DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(12731131) from x$dual;

3

blockID:

select DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(12731131) from x$dual;

148219

Dumping block

alter system dump datafile 3 block 148219;


UNDO BLK: 
xid: 0x0007.00d.001bec6f  seq: 0x41f9 cnt: 0x6   irb: 0x5   icl: 0x0   flg: 0x0000

 
Rec Offset      Rec Offset      Rec Offset      Rec Offset      Rec Offset

—————————————————————————

0x01 0x1f98     0x02 0x1f2c     0x03 0x1d7c     0x04 0x1d10     0x05 0x1ca0    
0x06 0x1bfc    
 
*—————————–

* Rec #0x1  slt: 0x0d  objn: 0(0x00000000)  objd: 0  tblspc: 0(0x00000000)

*       Layer:   5 (Transaction Undo)   opc: 7  rci 0x00  
Undo type:  Regular undo    Begin trans    Last buffer split:  No

Temp Object:  No

Tablespace Undo:  No

rdba: 0x00000000Ext idx: 0

flg2: 0

*—————————–

uba: 0x00c242fa.41f9.37 ctl max scn: 0x0000.789b7668 prv tx scn: 0x0000.789bb8d7

txn start scn: scn: 0x0000.789e783e logon user: 88

prev brb: 12731116 prev bcl: 0

 
*—————————–

* Rec #0x2  slt: 0x0d  objn: 110769(0x0001b0b1)  objd: 110769  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1  rci 0x00  
Undo type:  Regular undo    User Undo Applied  Last buffer split:  No

Temp Object:  No

Tablespace Undo:  No

rdba: 0x00000000

*—————————–

KDO undo record:

KTB Redo

op: 0x04  ver: 0x01 
compat bit: 4 (post-11) padding: 1

op: L  itl: xid:  0x0012.01c.00322281 uba: 0x0102c5f0.3fa9.0a

                      flg: C—    lkc:  0     scn: 0x0000.789ca3f4

KDO Op code: LKR row dependencies Disabled

  xtype: XA flags: 0x00000000  bdba: 0x038180fc  hdba: 0x018d64e2

itli: 1  ispac: 0  maxfr: 4858

tabn: 0 slot: 14 to: 0

 
*—————————–

* Rec #0x3  slt: 0x0d  objn: 110769(0x0001b0b1)  objd: 110769  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1   rci 0x02  
Undo type:  Regular undo    User Undo Applied  Last buffer split:  No

Temp Object:  No

Tablespace Undo:  No

rdba: 0x00000000

*—————————–

KDO undo record:

KTB Redo

op: 0x02  ver: 0x01 
compat bit: 4 (post-11) padding: 1

op: C  uba: 0x00c242fb.41f9.02

KDO Op code: URP row dependencies Disabled

  xtype: XA flags: 0x00000000  bdba: 0x038180fc  hdba: 0x018d64e2

itli: 1  ispac: 0  maxfr: 4858

tabn: 0 slot: 14(0xe) flag: 0x2c lock: 1 ckix: 0

ncol: 9 nnew: 6 size: 0

col  1: [ 7]  78 71 04 1d 13 01 01

col  2: [ 2]  c1 13

col  3: [ 1]  80

col  4: [16]  10 e5 00 2e 10 d1 10 d0 10 d7 10 e3 10 db 10 d8

col  5: [174]

10 d0 10 ed 10 d0 10 e0 10 d8 10 e1 00 20 10 d0 00 2e 10 e0 00 2e 00 20 10

de 10 e0 10 dd 10 d9 10 e3 10 e0 10 d0 10 e2 10 e3 10 e0 10 d8 10 e1 00 20

10 e1 10 d0 10 d2 10 d0 10 db 10 dd 10 eb 10 d8 10 d4 10 d1 10 dd 00 20 10

dc 10 d0 10 ec 10 d8 10 da 10 d8 10 e1 00 20 10 e3 10 e4 10 e0 10 dd 10 e1

00 20 10 d2 10 d0 10 db 10 dd 10 db 10 eb 10 d8 10 d4 10 d1 10 d4 10 da 10

e1 00 20 10 d1 10 d0 10 e2 10 dd 10 dc 00 20 10 d2 10 d8 10 dd 10 e0 10 d2

10 d8 00 20 10 de 10 d4 10 e0 10 d0 10 dc 10 d8 10 eb 10 d4 10 e1 00 2e

col  6: [36]

00 54 00 01 04 0c 00 00 00 02 00 00 00 01 00 00 09 07 b0 63 00 10 09 00 00

00 00 00 00 00 00 00 00 00 00 00

 
*—————————–

* Rec #0x4  slt: 0x0d  objn: 89834(0x00015eea)  objd: 93214  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1   rci 0x03  
Undo type:  Regular undo    User Undo Applied  Last buffer split:  No

Temp Object:  No

Tablespace Undo:  No

rdba: 0x00000000

*—————————–

KDO undo record:

KTB Redo

op: 0x04  ver: 0x01 
compat bit: 4 (post-11) padding: 1

op: L  itl: xid:  0x000c.017.000d65d6 uba: 0x0103df2c.22a5.20

                      flg: C—    lkc:  0     scn: 0x0000.789c4694

KDO Op code: LKR row dependencies Disabled

  xtype: XA flags: 0x00000000  bdba: 0x03833994  hdba: 0x0181f832

itli: 1  ispac: 0  maxfr: 4858

tabn: 0 slot: 7 to: 0

 
*—————————–

* Rec #0x5  slt: 0x0d  objn: 89834(0x00015eea)  objd: 93214  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1  rci 0x04  
Undo type:  Regular undo   Last buffer split:  No

Temp Object:  No

Tablespace Undo:  No

rdba: 0x00000000

*—————————–

KDO undo record:

KTB Redo

op: 0x02  ver: 0x01 
compat bit: 4 (post-11) padding: 1

op: C  uba: 0x00c242fb.41f9.04

KDO Op code: LMN row dependencies Disabled

  xtype: XA flags: 0x00000000  bdba: 0x03833994  hdba: 0x0181f832

itli: 1  ispac: 0  maxfr: 4858

 
*—————————–

* Rec #0x6  slt: 0x0d  objn: 89703(0x00015e67)  objd: 92020  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1  rci 0x05  
Undo type:  Regular undo    User Undo Applied  Last buffer split:  No

Temp Object:  No

Tablespace Undo:  No

rdba: 0x00000000

*—————————–

KDO undo record:

irb points to last UNDO RECORD in UNDO block.

rci points to previous UNDO RECORD. if rci=0, it’s the first UNDO RECORD.

Recovery operation starts from irb and chain is followed by rci until rci is zero.

The transaction starts recovery from UNDO RECORD of 0x5.

4. Reading UNDO Records:


* Rec #0x5  slt: 0x0d  objn: 89834(0x00015eea)  objd: 93214  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1   rci 0x04  
….

* Rec #0x4  slt: 0x0d  objn: 89834(0x00015eea)  objd: 93214  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1   rci 0x03  
….

* Rec #0x3  slt: 0x0d objn: 110769(0x0001b0b1)  objd: 110769  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1   rci 0x02  

* Rec #0x2  slt: 0x0d  objn: 110769(0x0001b0b1)  objd: 110769  tblspc: 6(0x00000006)

*       Layer:  11 (Row)   opc: 1   rci 0x00  

objn means object id.

5. Find these objects

The following objects need recovery:

select * from dba_objects

where object_id in (89834,110769);

………………………………………………………..

This problem is Oracle Bug:9857702:

.....
Affects:
Product (Component) Oracle Server (Rdbms)  
Range of versions believed to be affected Versions >= 11.1 but BELOW 12.1  
Versions confirmed as being affected
•11.2.0.1 
•11.1.0.7 
 
Platforms affected Generic (all / most platforms affected)  

Fixed:
This issue is fixed in
•12.1 (Future Release) 
•11.2.0.2 (Server Patch Set) 
•11.1.0.7.8 Patch Set Update 
•11.1.0.7 Patch 40 on Windows Platforms  
.....

6. Workaround:

  • Recreate objects that need recovery.
  • Or drop them Smile
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