Redmine

Isaac Cruz Ballesteros wrote:

A deadlock has nothing to with lock wait timeout, a deadlock occurs when transaction A blocks transaction B, and B blocks A

Yes, I changed the lock wait time and it didn't work.

Enter a 'show innodb status', it should describe the cause of the last deadlock

Here is the output of the command (a full output in attachment)

=====================================
090225  9:30:05 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 11 seconds
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 64, signal count 64
Mutex spin waits 0, rounds 870, OS waits 1
RW-shared spins 171, OS waits 13; RW-excl spins 66, OS waits 50
------------------------
LATEST DETECTED DEADLOCK
------------------------
090224 20:36:24
*** (1) TRANSACTION:
TRANSACTION 0 10412, ACTIVE 0 sec, process no 19408, OS thread id 3032349584 inserting
mysql tables in use 1, locked 1
LOCK WAIT 3 lock struct(s), heap size 320, undo log entries 1
MySQL thread id 5, query id 20932 localhost root update
INSERT INTO `changesets` (`commit_date`, `committed_on`, `comments`, `revision`, `scmid`, `user_id`, `repository_id`, `committer`) VALUES('2007-10-26 20:29:48', '2007-10-26 20:29:48', 'test.log', '601', NULL, NULL, 1, 'tanaka')
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 0 page no 281 n bits 944 index `changesets_repos_rev` of table `redmine/changesets` trx id 0 10412 lock mode S waiting
Record lock, heap no 278 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
 0: len 4; hex 80000001; asc     ;; 1: len 3; hex 363031; asc 601;; 2: len 4; hex 80000259; asc    Y;;

*** (2) TRANSACTION:
TRANSACTION 0 10411, ACTIVE 29 sec, process no 19408, OS thread id 3032550288 setting auto-inc lock
mysql tables in use 1, locked 1
4 lock struct(s), heap size 1024, undo log entries 2130
MySQL thread id 4, query id 20970 localhost root update
INSERT INTO `changesets` (`commit_date`, `committed_on`, `comments`, `revision`, `scmid`, `user_id`, `repository_id`, `committer`) VALUES('2007-10-30 13:50:20', '2007-10-30 13:50:20', 'add', '674', NULL, NULL, 1, 'suzuki')
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 0 page no 281 n bits 944 index `changesets_repos_rev` of table `redmine/changesets` trx id 0 10411 lock_mode X locks rec but not gap
Record lock, heap no 278 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
 0: len 4; hex 80000001; asc     ;; 1: len 3; hex 363031; asc 601;; 2: len 4; hex 80000259; asc    Y;;

*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
TABLE LOCK table `redmine/changesets` trx id 0 10411 lock mode AUTO-INC waiting
*** WE ROLL BACK TRANSACTION (1)
------------
TRANSACTIONS
------------
Trx id counter 0 10455
Purge done for trx's n:o < 0 10400 undo n:o < 0 0
History list length 2
Total number of lock structs in row lock hash table 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0 0, not started, process no 19408, OS thread id 3032750992
MySQL thread id 6, query id 166588 localhost root
show innodb status