记一次MySQL死锁排查过程

LOCK WAIT 2 lock struct(s), heap size 376, 1 row lock(s)

MySQL thread id 448218, OS thread handle 0x2abe5fb5d700, query id 18923238 renjun.fangcloud.net 121.41.41.92 root updating

delete from test where a = 2

*** (1) WAITING FOR THIS LOCK TO BE GRANTED:

RECORD LOCKS space id 0 page no 923 n bits 80 index `a` of table `oauthdemo`.`test` trx id 2A8BD lock_mode X waiting

Record lock, heap no 3 PHYSICAL RECORD: n_fields 2; compact format; info bits 32

0: len 4; hex 00000002; asc ;;

1: len 4; hex 00000002; asc ;;

*** (2) TRANSACTION:

TRANSACTION 2A8BC, ACTIVE 18 sec inserting

mysql tables in use 1, locked 1

4 lock struct(s), heap size 1248, 3 row lock(s), undo log entries 2

MySQL thread id 448217, OS thread handle 0x2abe5fd65700, query id 18923239 renjun.fangcloud.net 121.41.41.92 root update

insert into test (id,a) values (10,2)

*** (2) HOLDS THE LOCK(S):

RECORD LOCKS space id 0 page no 923 n bits 80 index `a` of table `oauthdemo`.`test` trx id 2A8BC lock_mode X locks rec but not gap

Record lock, heap no 3 PHYSICAL RECORD: n_fields 2; compact format; info bits 32

0: len 4; hex 00000002; asc ;;

1: len 4; hex 00000002; asc ;;

*** (2) WAITING FOR THIS LOCK TO

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