The impasse caused by the lack of clue on FK?

Hi all

I have an interesting case where a blockage has been raised and the research in the trace file, I see

Deadlock graph:
                       ---------Blocker(s)--------  ---------Waiter(s)---------
Resource Name          process session holds waits  process session holds waits
TM-0000b228-00000000        35    1057    SX             32    1068    SX   SSX
"TX-00090012-00008545        32    1068     X             21    1065           X"
TX-000a0009-0000bf57        21    1065     X             35    1057           X
 
session 1057: DID 0001-0023-00000400     session 1068: DID 0001-0020-00000131 
session 1068: DID 0001-0020-00000131     session 1065: DID 0001-0015-0000000A 
session 1065: DID 0001-0015-0000000A     session 1057: DID 0001-0023-00000400 
 
Rows waited on:
  Session 1057: obj - rowid = 0000B277 - AAALJ3AALAAAAL8AAA
  (dictionary objn - 45687, file - 11, block - 764, slot - 0)
  "Session 1068: no row"
  Session 1065: obj - rowid = 0000B228 - AAALIoAALAAAAY5AAP
  (dictionary objn - 45608, file - 11, block - 1593, slot - 15)
 
----- Information for the OTHER waiting sessions -----
Session 1068:
  sid: 1068 ser: 113 audsid: 282002 user: 129/LSM flags: 0x41
  pid: 32 O/S info: user: oracle, term: UNKNOWN, ospid: 23787
    image: oracle@oradev01
  client details:
    O/S info: user: apps1, term: unknown, ospid: 1234
    machine: oradev01 program: JDBC Thin Client
    application name: JDBC Thin Client, hash value=2546894660
  current SQL:
  
delete from cont_ctrl_prms where id=:1

Session 1065:
  sid: 1065 ser: 740 audsid: 281949 user: 129/LSM flags: 0x41
  pid: 21 O/S info: user: oracle, term: UNKNOWN, ospid: 28912
    image: oracle@oradev01
  client details:
    O/S info: user: apps1, term: unknown, ospid: 1234
    machine: oradev01 program: JDBC Thin Client
    application name: JDBC Thin Client, hash value=2546894660
  current SQL:
  
delete from availability where handle=:1

----- End of information for the OTHER waiting sessions -----

The version of db is 11.1.0.7.0 and the relationship between cont_ctrl_prms and availability is parent-> child.

There is a FK on availability as below with no rule as delete cascade

ALTER TABLE AVAILABILITY ADD
    CONSTRAINT FK7710155BB7FB8C0D FOREIGN KEY
    (
      CONTENTCONTROLPARAMS_ID
      )
      REFERENCES CONT_CTRL_PRMS (ID)

Now my question is: since there are no not delete cascade rule and no UPDATE in question, I assume that this may be caused by the index missing on the CF, so any idea why the deadlock has been generated?

Thanks in advance.

Jonathan Lewis wrote:

It looks like to trace dumped by 1057 session file.
What is the statement that 1057 expected?

I have a shot at fixing it fast anyway - here's my deadlock graph event upward:

I assumed that the SQL code of 1057 access something outside the parent/child, because the id of the object of the line expected was higher than the child object id (not guaranteed to be true, of course, but a reasonable estimate).

Deadlock graph:
                       ---------Blocker(s)--------  ---------Waiter(s)---------
Resource Name          process session holds waits  process session holds waits
TM-00019dbb-00000000        19      43    SX             26      40    SX   SSX
TX-000a001f-00002903        26      40     X             21      60           X
TX-0005001a-000032a5        21      60     X             19      43           X

session 43: DID 0001-0013-0000200C     session 40: DID 0001-001A-0000019C
session 40: DID 0001-001A-0000019C     session 60: DID 0001-0015-00005B0C
session 60: DID 0001-0015-00005B0C     session 43: DID 0001-0013-0000200C 

Rows waited on:
  Session 43: obj - rowid = 00019DBD - AAAZ29AADAAAAKBAAA
  (dictionary objn - 105917, file - 3, block - 641, slot - 0)
  Session 40: no row
  Session 60: obj - rowid = 00019DBB - AAAZ27AADAAAAGBAAE
  (dictionary objn - 105915, file - 3, block - 385, slot - 4)

----- Information for the OTHER waiting sessions -----
Session 40:

delete from parent where id = 1

Session 60:
delete from child where id = 3

Information for THIS session:

----- Current SQL Statement for this session (sql_id=1v6ndbw5ypwzy) -----
 update t1 set n1 = 1

Sequence of steps:
Table t1 has one row.
Parent table has three lines, p1, p2, p3
Child table has three lines c1, c2, c3
The rank of parent/child links are the most obvious.
The foreign key is declared, but has no support index

Session 43 delete c2 - laying of SX lock on child (TM/3)
Update session 60 T1
Session 40 remove c1, c3 - ask SX lock on child (TM/3)
session 43 updated t1 - start pending on session 60 (TX/6)
Session 60 remove c3 - start pending on 40 session (TX/6)
Session 40 remove p1 - start pending on session 43 - SX to the conversion of SSX (TM / 3-> TM/5)

Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
Author: core Oracle

Tags: Database

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