Deadlock occur session is blocking its own session

Question

i'm getting deal lock in my process , this is comming when i'm trying to calculate ID/primary key valuce
from ID table , we maintain a table for PK each time we need we read the value and increament the value by one for the next procuess . but here u seen for deadlock blocker and witer is same
and dead lock i comming at same line every time
line is select ... from id table for update of id ;
please help me why it is comming
Trace file:ORACLE.GPRD.OSDI.TRACE.T1930834.G0010010
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00020017-000282b2 18 19 X 18 19 X
session 19: DID 0001-0012-00000035.session 19: DID 0001-0012-00000035
Rows waited on:
Session 19: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
Trace file:ORACLE.GPRD.OSDI.TRACE.T1930834.G0010012
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00140021-0002d6d0 20 22 X 20 22 X
session 22: DID 0001-0014-00002734.session 22: DID 0001-0014-00002734
Rows waited on:
Session 22: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
Trace File:ORACLE.GPRD.OSDI.TRACE.T1930904.G028000A
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00120026-00028b60 12 14 X 12 14 X
session 14: DID 0001-000C-00002913.session 14: DID 0001-000C-00002913
Rows waited on:
Session 14: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00120026-00028b60 12 14 X 12 14 X
session 14: DID 0001-000C-00002913.session 14: DID 0001-000C-00002913
Rows waited on:
Session 14: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
Trace file:ORACLE.GPRD.OSDI.TRACE.T1930834.G005000C
Resource Name process session holds waits process session holds waits
TX-0007002c-000282f7 14 13 X 14 13 X
session 13: DID 0001-000E-00000023.session 13: DID 0001-000E-00000023
Rows waited on:
Session 13: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
Trace File:ORACLE.GPRD.OSDI.TRACE.T1931520.G002000D
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-0005000a-0002d905 15 16 X 15 16 X
session 16: DID 0001-000F-00004F28.session 16: DID 0001-000F-00004F28
Rows waited on:
Session 16: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
trace File:ORACLE.GPRD.OSDI.TRACE.T1930834.G001000E
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00170013-000284f7 16 17 X 16 17 X
session 17: DID 0001-0010-00000039.session 17: DID 0001-0010-00000039
Rows waited on:
Session 17: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
Trace File:ORACLE.GPRD.OSDI.TRACE.T1930834.G0010011
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00140026-0002d681 19 20 X 19 20 X
session 20: DID 0001-0013-00000013.session 20: DID 0001-0013-00000013
Rows waited on:
Session 20: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
--------------------------------------------------------------------------------

Answer 1

Dear
information may aid in determining the deadlock:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds waits
TX-00020017-000282b2 18 19 X 18 19 X
session 19: DID 0001-0012-00000035.session 19: DID 0001-0012-00000035
Rows waited on:
Session 19: obj - rowid = 00001209 - AAAEiHAA0AAACCyAAd
(dictionary objn - 4617, file - 52, block - 8370, slot - 29)
Information on the OTHER waiting sessions:
End of information on OTHER waiting sessions.
Current SQL statement for this session:
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
SELECT NEXT_ID, UPDATE_DT_TIME, UPDATE_USER_ID FROM ID_V WHERE UPPER(TABLE_NAME)
Trace file:ORACLE.GPRD.OSDI.TRACE.T1930834.G0010012 You are getting TX (Transaction lock) on X(exclusive) mode. This is either a row locking or a PK/UK enforcement.
If you post your code here and if you are using autonomous transaction, I might be able to change a little bit your code to avoid using autonomous transaction and hence to avoid your deadlock which, in contrast to what has been said here by one of the contributors, has to be solved and has not to be let in the hand of Oracle which will select arbitrarly a victim session and kills it to release the lock.
Best Regards
Mohamed Houri