It is getting more and more strange. We encountered today a bunch of
problems that looks like a normal deadlock caused by application
behaviour (lot of users deadlocking each other). In this case as you
can see the mode is just same (5 on both ends) as with the previously
mentioned deadlocks. The only difference is that these are occurying
between instances. The strange is that these ones were accompanied with
the SQL that caused the problem. So I'm not sure if in our case your
statement "If the deadlock is on mode 5 enqueues at both ends, it is
most likely to be the foreign key locking issue" is correct.
See below:
- 2005-11-09 08:16:10.087
user session for deadlock lock 70000016a0b29b8
pid=825 serial=32833 audsid=14358159 user: 425/USER
O/S info: user: wasadmin, term: , ospid: 1323120, machine: cn67b1
program: /was5/WebSphere/AppServer/java/bin/java_at_cn67b1 (
application name: /was5/WebSphere/AppServer/java/bin/java_at_cn67b1 (,
hash value=0
Current SQL Statement:
DELETE FROM SESSION_DATA WHERE SESSION_ID = :1 AND DATA_KEY = :2
user session for deadlock lock 70000016c0b07b0
pid=867 serial=37699 audsid=14358272 user: 425/USER
O/S info: user: wasadmin, term: , ospid: 1323120, machine: cn67b1
program: /was5/WebSphere/AppServer/java/bin/java_at_cn67b1 (
application name: /was5/WebSphere/AppServer/java/bin/java_at_cn67b1 (,
hash value=0
Current SQL Statement:
DELETE FROM SESSION_DATA WHERE SESSION_ID = :1 AND DATA_KEY = :2
Global Wait-For-Graph(WFG) at ddTS[0.eff6] :
BLOCKED 70000016a0b29b8 5 [0x20a0008][0x1cb52],[TX] [66361,527468] 0
BLOCKER 70000016f469718 5 [0x20a0008][0x1cb52],[TX] [131371,47259] 1
BLOCKED 70000016f469718 5 [0x20a0008][0x1cb52],[TX] [131371,47259] 1
BLOCKER 70000016bc15980 5 [0x20a0008][0x1cb52],[TX] [131217,103403] 1
BLOCKED 70000016b47f828 5 [0xbc001d][0x6ed23],[TX] [131217,103403] 1
BLOCKER 70000016d0b11a0 5 [0xbc001d][0x6ed23],[TX] [131469,20450] 1
BLOCKED 70000016d0b11a0 5 [0xbc001d][0x6ed23],[TX] [131469,20450] 1
BLOCKER 70000016d0b8a18 5 [0xbc001d][0x6ed23],[TX] [131394,51017] 1
BLOCKED 70000016d0b8b98 5 [0x400005][0x6914],[TX] [131394,51017] 1
BLOCKER 70000016c0b0648 5 [0x400005][0x6914],[TX] [66403,574442] 0
BLOCKED 70000016c0b07b0 5 [0x3d0017][0x82a7],[TX] [66403,574442] 0
BLOCKER 70000016a0b2400 5 [0x3d0017][0x82a7],[TX] [66361,527468] 0
--
Dusan Bolek
Received on Wed Nov 09 2005 - 03:47:59 CST
