MySQL死锁日志
查看数据库死锁日志
查看命令：show engine innodb status \G
说明：通过show engine innodb status 查看的日志是最新一次记录死锁的日志，但是查看不到完整的事务的sql，通常显示当前正在等待锁的sql；
死锁日志解析
- lock_mode X locks rec but not gap：模式排它锁，类型行锁；
- lock_mode X locks gap before rec ：模式排它锁，类型gap锁；
- lock_mode X locks gap before rec insert intention：模式排它锁，类型插入意向锁；
- lock_mode X：Next-key锁；
2019-04-23 19:30:55 0x7f30bc478700
*** (1) TRANSACTION:
//第一个事务ID
TRANSACTION 6310726, ACTIVE 0 sec starting index read
mysql tables in use 1, locked 1
LOCK WAIT 4 lock struct(s), heap size 1136, 2 row lock(s)
MySQL thread id 3972328, OS thread handle 139847097263872, query id 68564302 10.83.188.19 test@dd updating
//当前事务正在等待获取锁的SQL
update file
SET file_name = 'dwm_gulf_passenger_finish_behavior_his',
file_desc = '改造测试',
file_type = 100,
project_id = 743,
file_folder_id = '4fae643d3a924a5b84aa366c94173bfb',
last_edit_time = '2019-04-23 19:30:55',
last_edit_user = 'zhangsan',
file_lock_user = '',
current_version = 1,
file_lock_status = 0,
file_delete = 0,
use_type = 1,
schedule_uuid = 'aa.bb',
commit_status = 1,
share = 0,
creator_user = 'zhangsan',
create_time = '2019-04-23 17:54:46',
//当前事务正在等待获取锁的信息
*** (1) WAITING FOR THIS LOCK TO BE GRANTED :
#等待锁信息：类型行锁，在file表的主键索引上，模式排它锁，没有GAP锁
RECORD LOCKS space id 57 page no 779 n bits 80 index PRIMARY of table `test`.`file` trx id 6310726 lock_mode X locks rec but not gap waiting（只是等待行锁，不包含gap锁）
//等待记录锁的具体信息，共22个字段
Record lock, heap no 5 PHYSICAL RECORD: n_fields 22; compact format; info bits 0
0: len 8; hex 8000000000001726; asc &;;
1: len 6; hex 000000604b45; asc `KE;;
2: len 7; hex 27000000a112b6; asc ' ;;
3: len 30; hex 64776d5f67756c665f70617373656e6765725f66696e6973685f62656861; asc dwm_gulf_passenger_finish_beha; (total 38 bytes);
4: len 30; hex e4b893e8bda6e794a8e688b7e5ae8ce68890e8a18ce4b8bae8a1a82de69a; asc - ; (total 52 bytes);
5: len 4; hex 80000064; asc d;;
6: len 8; hex 00000000000002e7; asc ;;
7: len 30; hex 346661653634336433613932346135623834616133363663393431373362; asc 4fae643d3a924a5b84aa366c94173b; (total 32 bytes);
8: len 5; hex 99a2ef37b7; asc 7 ;;
9: len 10; hex 66756775616e71695f69; asc fuguanqi_i;;
10: len 0; hex ; asc ;;
11: len 8; hex 8000000000000001; asc ;;
12: len 4; hex 80000000; asc ;;
13: len 4; hex 80000000; asc ;;
14: len 4; hex 80000001; asc ;;
15: len 30; hex 626173655f64772e64776d5f67756c665f70617373656e6765725f66696e; asc base_dw.dwm_gulf_passenger_fin; (total 46 bytes);
16: len 4; hex 80000001; asc ;;
17: len 30; hex 23212f62696e2f626173680a2323205348454c4c0a232323232323232323; asc #!/bin/bash ## SHELL #########; (total 4979 bytes);
18: len 4; hex 80000000; asc ;;
19: len 10; hex 66756775616e71695f69; asc fuguanqi_i;;
20: len 4; hex 5cbee0e6; asc \ ;;
21: len 12; hex 53484544554c455f5441534b; asc SHEDULE_TASK;;
*** (2) TRANSACTION:
//事务2信息
TRANSACTION 6310725, ACTIVE 0 sec inserting, thread declared inside InnoDB 5000
mysql tables in use 1, locked 1
5 lock struct(s), heap size 1136, 3 row lock(s), undo log entries 2
MySQL thread id 3962755, OS thread handle 139847293961984, query id 68564303 10.83.189.16 test@dd update
//当前事务等待锁的SQL
insert into file_version
( file_id,
file_version,
commit_time,
commit_user,
schedule_uuid,
file_type,
use_type,
file_desc,
file_name,
status,
change_type,
is_current_prod,
project_id,
file_content,
comment,
schedule_content,
file_property_content )
values ( 5926,
1,
'2019-04-23 19:30:55',
'zhangsan',
'aa.bb',
100,
1,
'测试'
//当前事务持有的锁信息
*** (2) HOLDS THE LOCK(S):
#持有锁信息：行锁，在file表的主键索引上，没有GAP锁
RECORD LOCKS space id 57 page no 779 n bits 80 index PRIMARY of table `datastudio`.`file` trx id 6310725 lock_mode X locks rec but not gap（行锁）
//当前事务持有的行锁信息，当前记录22个字段
Record lock, heap no 5 PHYSICAL RECORD: n_fields 22; compact format; info bits 0
0: len 8; hex 8000000000001726; asc &;;
1: len 6; hex 000000604b45; asc `KE;;
2: len 7; hex 27000000a112b6; asc ' ;;
3: len 30; hex 64776d5f67756c665f70617373656e6765725f66696e6973685f62656861; asc dwm_gulf_passenger_finish_beha; (total 38 bytes);
4: len 30; hex e4b893e8bda6e794a8e688b7e5ae8ce68890e8a18ce4b8bae8a1a82de69a; asc - ; (total 52 bytes);
5: len 4; hex 80000064; asc d;;
6: len 8; hex 00000000000002e7; asc ;;
7: len 30; hex 346661653634336433613932346135623834616133363663393431373362; asc 4fae643d3a924a5b84aa366c94173b; (total 32 bytes);
8: len 5; hex 99a2ef37b7; asc 7 ;;
9: len 10; hex 66756775616e71695f69; asc fuguanqi_i;;
10: len 0; hex ; asc ;;
11: len 8; hex 8000000000000001; asc ;;
12: len 4; hex 80000000; asc ;;
13: len 4; hex 80000000; asc ;;
14: len 4; hex 80000001; asc ;;
15: len 30; hex 626173655f64772e64776d5f67756c665f70617373656e6765725f66696e; asc base_dw.dwm_gulf_passenger_fin; (total 46 bytes);
16: len 4; hex 80000001; asc ;;
17: len 30; hex 23212f62696e2f626173680a2323205348454c4c0a232323232323232323; asc #!/bin/bash ## SHELL #########; (total 4979 bytes);
18: len 4; hex 80000000; asc ;;
19: len 10; hex 66756775616e71695f69; asc fuguanqi_i;;
20: len 4; hex 5cbee0e6; asc \ ;;
21: len 12; hex 53484544554c455f5441534b; asc SHEDULE_TASK;;
//当前事务等待锁的信息
*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
#等待锁信息：行锁，在file_version表的idx_fid_fversion索引上，没有GAP锁
RECORD LOCKS space id 59 page no 377 n bits 608 index idx_fid_fversion of table `test`.`file_version` trx id 6310725 lock_mode X locks gap before rec insert intention waiting
Record lock, heap no 533 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 8; hex 0000000000001728; asc (;;
1: len 8; hex 8000000000000001; asc ;;
2: len 8; hex 0000000000002f64; asc /d;;
//日志含义：数据库最终选择回滚事务1
//说明：当数据库检测到死锁后，会按照某种策略计算出每个事务的代价，回滚代价最小的事务从而解开死锁
*** WE ROLL BACK TRANSACTION (1)
参考：
- https://825635381.iteye.com/blog/2339503
- http://www.fanyilun.me/2017/04/20/MySQL加锁分析/