MySQL死锁日志
MySQL的死锁可以通过show engine innodb status\G;来查看，
最近的死锁信息在LATEST DETECTED DEADLOCK下面。
但是这种方式只能显示最新的一条死锁信息，该方式无法完全捕获到系统发生的死锁信息。
MySQL 系统内部提供一个 innodb_print_all_deadlocks 参数，该参数默认是关闭的，
开启后可以将死锁信息自动记录到 MySQL 的错误日志中。下面我们来看下这个参数的作用：
# 查看参数是否开启
mysql> show variables like 'innodb_print_all_deadlocks';
+----------------------------+-------+
| Variable_name | Value |
+----------------------------+-------+
| innodb_print_all_deadlocks | OFF |
+----------------------------+-------+
1 row in set (0.00 sec)
# 开启innodb_print_all_deadlocks,此参数是全局参数，可以动态调整。
mysql> set global innodb_print_all_deadlocks = 1;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like 'innodb_print_all_deadlocks';
+----------------------------+-------+
| Variable_name | Value |
+----------------------------+-------+
| innodb_print_all_deadlocks | ON |
+----------------------------+-------+
1 row in set (0.00 sec)
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查看错误日志文件放在哪里
mysql> show variables like 'log_error%';
+---------------------+---------------------+
| Variable_name | Value |
+---------------------+---------------------+
| log_error | /var/log/mysqld.log |
| log_error_verbosity | 3 |
+---------------------+---------------------+
2 rows in set (0.00 sec)
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也可以查看my.cnf的log-error属性
新建表
CREATE TABLE t1 (
id int(11) NOT NULL,
a int(11) DEFAULT NULL,
b int(11) DEFAULT NULL,
PRIMARY KEY (id),
KEY a (a)
) ENGINE=InnoDB;
insert into t1(id,a,b)values(5,5,5),(10,10,10);
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构造死锁情况
A B
t1 update t1 set b = b + 100 where id = 5; update t1 set b = b + 200 where id = 10;
t2 update t1 set b = b + 222 where id = 5;
t3 update t1 set b = b + 111 where id = 10;
ERROR 1213 (40001): Deadlock found when trying to get lock; try restarting transaction
使用show engine innodb status\G;查看
找到LATEST DETECTED DEADLOCK
------------------------
LATEST DETECTED DEADLOCK
------------------------
2023-03-10 14:57:50 0x7f5c285a3700
*** (1) TRANSACTION:
TRANSACTION 1399, ACTIVE 20 sec starting index read
mysql tables in use 1, locked 1
LOCK WAIT 3 lock struct(s), heap size 1136, 2 row lock(s), undo log entries 1
MySQL thread id 36, OS thread handle 140033790449408, query id 647 localhost root updating
update t1 set b = b + 222 where id = 5
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 25 page no 3 n bits 72 index PRIMARY of table `test`.`t1` trx id 1399 lock_mode X locks rec but not gap waiting
Record lock, heap no 2 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 4; hex 80000005; asc ;;
1: len 6; hex 000000000576; asc v;;
2: len 7; hex 4c000001580110; asc L X ;;
3: len 4; hex 80000005; asc ;;
4: len 4; hex 8000008a; asc ;;
*** (2) TRANSACTION:
TRANSACTION 1398, ACTIVE 34 sec starting index read
mysql tables in use 1, locked 1
3 lock struct(s), heap size 1136, 2 row lock(s), undo log entries 1
MySQL thread id 35, OS thread handle 140033790719744, query id 648 localhost root updating
update t1 set b = b + 111 where id = 10
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 25 page no 3 n bits 72 index PRIMARY of table `test`.`t1` trx id 1398 lock_mode X locks rec but not gap
Record lock, heap no 2 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 4; hex 80000005; asc ;;
1: len 6; hex 000000000576; asc v;;
2: len 7; hex 4c000001580110; asc L X ;;
3: len 4; hex 80000005; asc ;;
4: len 4; hex 8000008a; asc ;;
*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 25 page no 3 n bits 72 index PRIMARY of table `test`.`t1` trx id 1398 lock_mode X locks rec but not gap waiting
Record lock, heap no 3 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 4; hex 8000000a; asc ;;
1: len 6; hex 000000000577; asc w;;
2: len 7; hex 4d000001590110; asc M Y ;;
3: len 4; hex 8000000a; asc ;;
4: len 4; hex 80000107; asc ;;
*** WE ROLL BACK TRANSACTION (2)
------------
TRANSACTIONS
------------
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也可以通过查看错误日志找到死锁信息，
2023-03-10T06:57:50.483512Z 35 [Note] InnoDB: Transactions deadlock detected, dumping detailed information.
2023-03-10T06:57:50.484236Z 35 [Note] InnoDB:
*** (1) TRANSACTION:
TRANSACTION 1399, ACTIVE 20 sec starting index read
mysql tables in use 1, locked 1
LOCK WAIT 3 lock struct(s), heap size 1136, 2 row lock(s), undo log entries 1
MySQL thread id 36, OS thread handle 140033790449408, query id 647 localhost root updating
update t1 set b = b + 222 where id = 5
2023-03-10T06:57:50.484283Z 35 [Note] InnoDB: *** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 25 page no 3 n bits 72 index PRIMARY of table `test`.`t1` trx id 1399 lock_mode X locks rec but not gap waiting
Record lock, heap no 2 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 4; hex 80000005; asc ;;
1: len 6; hex 000000000576; asc v;;
2: len 7; hex 4c000001580110; asc L X ;;
3: len 4; hex 80000005; asc ;;
4: len 4; hex 8000008a; asc ;;
2023-03-10T06:57:50.484432Z 35 [Note] InnoDB: *** (2) TRANSACTION:
TRANSACTION 1398, ACTIVE 34 sec starting index read
mysql tables in use 1, locked 1
3 lock struct(s), heap size 1136, 2 row lock(s), undo log entries 1
MySQL thread id 35, OS thread handle 140033790719744, query id 648 localhost root updating
update t1 set b = b + 111 where id = 10
2023-03-10T06:57:50.484455Z 35 [Note] InnoDB: *** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 25 page no 3 n bits 72 index PRIMARY of table `test`.`t1` trx id 1398 lock_mode X locks rec but not gap
Record lock, heap no 2 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 4; hex 80000005; asc ;;
1: len 6; hex 000000000576; asc v;;
2: len 7; hex 4c000001580110; asc L X ;;
3: len 4; hex 80000005; asc ;;
4: len 4; hex 8000008a; asc ;;
2023-03-10T06:57:50.484600Z 35 [Note] InnoDB: *** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 25 page no 3 n bits 72 index PRIMARY of table `test`.`t1` trx id 1398 lock_mode X locks rec but not gap waiting
Record lock, heap no 3 PHYSICAL RECORD: n_fields 5; compact format; info bits 0
0: len 4; hex 8000000a; asc ;;
1: len 6; hex 000000000577; asc w;;
2: len 7; hex 4d000001590110; asc M Y ;;
3: len 4; hex 8000000a; asc ;;
4: len 4; hex 80000107; asc ;;
2023-03-10T06:57:50.484737Z 35 [Note] InnoDB: *** WE ROLL BACK TRANSACTION (2)
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文章知识点与官方知识档案匹配，可进一步学习相关知识
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原文链接：https://blog.csdn.net/lizc_lizc/article/details/129444088
