测试环境： MySQL 5.7.26 创建测试表：
mysql> create table t3(id int not null default '0',primary key(id)); Query OK, 0 rows affected (0.00 sec)
插入测试数据：
mysql> insert into t3 values(1); Query OK, 1 row affected (0.00 sec)
死锁模拟过程如下：
会话1commit之后，会话2核会话3产生死锁，会话3回滚，并抛出：
ERROR 1213 (40001): Deadlock found when trying to get lock; try restarting transaction过程说明：
死锁日志：
LATEST DETECTED DEADLOCK ------------------------ 2020-08-21 18:23:54 0x7f39023e7700 *** (1) TRANSACTION: TRANSACTION 26174234, ACTIVE 8 sec inserting mysql tables in use 1, locked 1 LOCK WAIT 3 lock struct(s), heap size 1136, 2 row lock(s) MySQL thread id 208, OS thread handle 139883056465664, query id 3858292 localhost root update insert into t3 values(1) *** (1) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 833 page no 3 n bits 72 index PRIMARY of table `test`.`t3` trx id 26174234 lock_mode X locks rec but not gap waiting Record lock, heap no 2 PHYSICAL RECORD: n_fields 3; compact format; info bits 32 0: len 4; hex 80000001; asc ;; 1: len 6; hex 0000018f6307; asc c ;; 2: len 7; hex 3b000021e40110; asc ; ! ;; *** (2) TRANSACTION: TRANSACTION 26174241, ACTIVE 5 sec inserting, thread declared inside InnoDB 1 mysql tables in use 1, locked 1 3 lock struct(s), heap size 1136, 2 row lock(s) MySQL thread id 210, OS thread handle 139882827511552, query id 3858305 localhost root update insert into t3 values(1) *** (2) HOLDS THE LOCK(S): RECORD LOCKS space id 833 page no 3 n bits 72 index PRIMARY of table `test`.`t3` trx id 26174241 lock mode S locks rec but not gap Record lock, heap no 2 PHYSICAL RECORD: n_fields 3; compact format; info bits 32 0: len 4; hex 80000001; asc ;; 1: len 6; hex 0000018f6307; asc c ;; 2: len 7; hex 3b000021e40110; asc ; ! ;; *** (2) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 833 page no 3 n bits 72 index PRIMARY of table `test`.`t3` trx id 26174241 lock_mode X locks rec but not gap waiting Record lock, heap no 2 PHYSICAL RECORD: n_fields 3; compact format; info bits 32 0: len 4; hex 80000001; asc ;; 1: len 6; hex 0000018f6307; asc c ;; 2: len 7; hex 3b000021e40110; asc ; ! ;; *** WE ROLL BACK TRANSACTION (2)
