1. View the log about Deadlock in mysql
Command: mysql> show engine innodb status \G;
2. Analyze the log of dead lock
wrote
------------------------
LATEST DETECTED DEADLOCK
------------------------
2017-09-14 13:51:03 7f3efdceb700
*** (1) TRANSACTION:
TRANSACTION 280219276, ACTIVE 0 sec starting index read
mysql tables in use 1, locked 1
LOCK WAIT 17 lock struct(s), heap size 2936, 8 row lock(s), undo log entries 6
MySQL thread id 375, OS thread handle 0x7f3efdb65700, query id 75220097 ded405.zylon.net 193.*.*138 root updating
update article set version=16 where id=46182 and version=15
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 21 page no 786 n bits 136 index `PRIMARY` of table `sils`.`article` trx id 280219276 lock_mode X locks rec but not gap waiting
Record lock, heap no 55 PHYSICAL RECORD: n_fields 32; compact format; info bits 0
LATEST DETECTED DEADLOCK
------------------------
2017-09-14 13:51:03 7f3efdceb700
*** (1) TRANSACTION:
TRANSACTION 280219276, ACTIVE 0 sec starting index read
mysql tables in use 1, locked 1
LOCK WAIT 17 lock struct(s), heap size 2936, 8 row lock(s), undo log entries 6
MySQL thread id 375, OS thread handle 0x7f3efdb65700, query id 75220097 ded405.zylon.net 193.*.*138 root updating
update article set version=16 where id=46182 and version=15
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 21 page no 786 n bits 136 index `PRIMARY` of table `sils`.`article` trx id 280219276 lock_mode X locks rec but not gap waiting
Record lock, heap no 55 PHYSICAL RECORD: n_fields 32; compact format; info bits 0
*** (2) TRANSACTION:
TRANSACTION 280219277, ACTIVE 0 sec starting index read
mysql tables in use 1, locked 1
17 lock struct(s), heap size 2936, 8 row lock(s), undo log entries 6
MySQL thread id 440, OS thread handle 0x7f3efdceb700, query id 75220111 ded405.zylon.net 193.*.*.138 root updating
update article set version=16 where id=46182 and version=15
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 21 page no 786 n bits 136 index `PRIMARY` of table `sils`.`article` trx id 280219277 lock mode S locks rec but not gap
Record lock, heap no 55 PHYSICAL RECORD: n_fields 32; compact format; info bits 0
TRANSACTION 280219277, ACTIVE 0 sec starting index read
mysql tables in use 1, locked 1
17 lock struct(s), heap size 2936, 8 row lock(s), undo log entries 6
MySQL thread id 440, OS thread handle 0x7f3efdceb700, query id 75220111 ded405.zylon.net 193.*.*.138 root updating
update article set version=16 where id=46182 and version=15
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 21 page no 786 n bits 136 index `PRIMARY` of table `sils`.`article` trx id 280219277 lock mode S locks rec but not gap
Record lock, heap no 55 PHYSICAL RECORD: n_fields 32; compact format; info bits 0
By default, mysql will only record the log when the last deadlock is generated, focusing on the operation of mysql in the two transactions that conflict.
3. Combine the stack information about deadlock in tomcat to analyze which process is wrong. (If necessary, you need to print out all the sql statements during hibernate operation and analyze them together).
To be continued. . .