MYSQL RC模式insert update 可能死锁的情况

涉及的语句为
RC模式下
update根据主键更新和insert
其实这样的问题在RC模式下，要么是简单update问题，要么是insert造成的主键和唯一键检查唯一性时出现问题。
下面以主键问题为列子进行分析一下可能出现的情况。

update  where条件更新为主键，锁结构出现在单行主键上，辅助索引包含隐含锁结构，当前读RC非唯一索引模式没有GAP锁，
insert  插入印象锁，主键和辅助索引上会出现隐含锁结构，

但是在RC模式下没有GAP所以插入印象锁一般不会成为问题


表结构：
+---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                                                                                                      |
+---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| testlll | CREATE TABLE `testlll` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=24 DEFAULT CHARSET=latin1 |
+---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


情况1
insert
update


TX1：                                                                  TX2：
insert into testlll(name) values('gaopeng');
                                                                          insert into testlll(name) values('gaopeng');
update testlll set name='gaopeng1' where id=25;(堵塞)
                                                                           update testlll set name='gaopeng1' where id=24;(堵塞)
                                               
死锁

锁结构：

点击(此处)折叠或打开

1. ---TRANSACTION 322809, ACTIVE 30 sec starting index read
   
2. mysql tables in use 1, locked 1
   
3. 3 lock struct(s), heap size 1160, 2 row lock(s), undo log entries 1
   
4. MySQL thread id 3, OS thread handle 140734663714560, query id 409 localhost root updating
   
5. update testlll set name='gaopeng1' where id=24
   
6. ---lock strcut(1):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
   
7. TABLE LOCK table `test`.`testlll` trx id 322809 lock mode IX
   
8. ---lock strcut(2):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
   
9. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 322809 lock_mode X(LOCK_X) locks rec but not gap(LOCK_REC_NOT_GAP)
   
10. Record lock, heap no 25 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
11.  0: len 4; hex 80000019; asc ;;
    
12.  1: len 6; hex 00000004ecf9; asc ;;
    
13.  2: len 7; hex f0000001f90110; asc ;;
    
14.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
15. 
    
16. ---lock strcut(3):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
17. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 322809 lock_mode X(LOCK_X) locks rec but not gap(LOCK_REC_NOT_GAP) waiting(LOCK_WAIT)
    
18. Record lock, heap no 20 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
19.  0: len 4; hex 80000018; asc ;;
    
20.  1: len 6; hex 00000004ecf8; asc ;;
    
21.  2: len 7; hex ef000001f80110; asc ;;
    
22.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
23. 
    
24. ---TRANSACTION 322808, ACTIVE 43 sec starting index read
    
25. mysql tables in use 1, locked 1
    
26. LOCK WAIT 3 lock struct(s), heap size 1160, 2 row lock(s), undo log entries 1
    
27. MySQL thread id 2, OS thread handle 140734663980800, query id 408 localhost root updating
    
28. update testlll set name='gaopeng1' where id=25
    
29. ------- TRX HAS BEEN WAITING 5 SEC FOR THIS LOCK TO BE GRANTED:
    
30. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 322808 lock_mode X(LOCK_X) locks rec but not gap(LOCK_REC_NOT_GAP) waiting(LOCK_WAIT)
    
31. Record lock, heap no 25 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
32.  0: len 4; hex 80000019; asc ;;
    
33.  1: len 6; hex 00000004ecf9; asc ;;
    
34.  2: len 7; hex f0000001f90110; asc ;;
    
35.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
36. 
    
37. ------------------
    
38. ---lock strcut(1):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
39. TABLE LOCK table `test`.`testlll` trx id 322808 lock mode IX
    
40. ---lock strcut(2):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
41. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 322808 lock_mode X(LOCK_X) locks rec but not gap(LOCK_REC_NOT_GAP) waiting(LOCK_WAIT)
    
42. Record lock, heap no 25 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
43.  0: len 4; hex 80000019; asc ;;
    
44.  1: len 6; hex 00000004ecf9; asc ;;
    
45.  2: len 7; hex f0000001f90110; asc ;;
    
46.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
47. 
    
48. ---lock strcut(3):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
49. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 322808 lock_mode X(LOCK_X) locks rec but not gap(LOCK_REC_NOT_GAP)
    
50. Record lock, heap no 20 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
51.  0: len 4; hex 80000018; asc ;;
    
52.  1: len 6; hex 00000004ecf8; asc ;;
    
53.  2: len 7; hex ef000001f80110; asc ;;
    
54.  3: len 7; hex 67616f70656e67; asc gaopeng;;

情况2
update
update

TX1：                                                                    TX2：
update testlll set name='gaopeng1' where id=22;
                                                                            update testlll set name='gaopeng1' where id=25;
update testlll set name='gaopeng1' where id=25;(堵塞)
                                                                             update testlll set name='gaopeng1' where id=22;(堵塞)
死锁


这种情况比较简单不打印出锁结构


情况3
insert
insert


TX1：                                                      TX2:
insert into testlll values(26,'gaopeng');
                                                             insert into testlll values(27,'gaopeng');
nsert into testlll values(27,'gaopeng');(堵塞)
                                                             insert into testlll values(26,'gaopeng');(堵塞)


死锁

锁结构:

点击(此处)折叠或打开

1. ---TRANSACTION 422212176315800, not started
   
2. 0 lock struct(s), heap size 1160, 0 row lock(s)
   
3. ---TRANSACTION 323284, ACTIVE 10 sec inserting
   
4. mysql tables in use 1, locked 1
   
5. 3 lock struct(s), heap size 1160, 2 row lock(s), undo log entries 1
   
6. MySQL thread id 2, OS thread handle 140734663980800, query id 369 localhost root update
   
7. insert into testlll values(26,'gaopeng')
   
8. ---lock strcut(1):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
   
9. TABLE LOCK table `test`.`testlll` trx id 323284 lock mode IX
   
10. ---lock strcut(2):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
11. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 323284 lock_mode X(LOCK_X) locks rec but not gap(LOCK_REC_NOT_GAP)
    
12. Record lock, heap no 27 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
13.  0: len 4; hex 8000001b; asc ;;
    
14.  1: len 6; hex 00000004eed4; asc ;;
    
15.  2: len 7; hex d3000002a10110; asc ;;
    
16.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
17. 
    
18. 
    
19. ---lock strcut(3):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
20. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 323284 lock mode S(LOCK_S) locks rec but not gap(LOCK_REC_NOT_GAP) waiting(LOCK_WAIT)
    
21. Record lock, heap no 26 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
22.  0: len 4; hex 8000001a; asc ;;
    
23.  1: len 6; hex 00000004eed3; asc ;;
    
24.  2: len 7; hex d2000002330110; asc 3 ;;
    
25.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
26. 
    
27. 
    
28. ---TRANSACTION 323283, ACTIVE 14 sec inserting
    
29. mysql tables in use 1, locked 1
    
30. LOCK WAIT 3 lock struct(s), heap size 1160, 2 row lock(s), undo log entries 1
    
31. MySQL thread id 3, OS thread handle 140734663714560, query id 368 localhost root update
    
32. insert into testlll values(27,'gaopeng')
    
33. ------- TRX HAS BEEN WAITING 5 SEC FOR THIS LOCK TO BE GRANTED:
    
34. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 323283 lock mode S(LOCK_S) locks rec but not gap(LOCK_REC_NOT_GAP) waiting(LOCK_WAIT)
    
35. Record lock, heap no 27 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
36.  0: len 4; hex 8000001b; asc ;;
    
37.  1: len 6; hex 00000004eed4; asc ;;
    
38.  2: len 7; hex d3000002a10110; asc ;;
    
39.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
40. 
    
41. 
    
42. ------------------
    
43. ---lock strcut(1):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
44. TABLE LOCK table `test`.`testlll` trx id 323283 lock mode IX
    
45. ---lock strcut(2):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
46. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 323283 lock mode S(LOCK_S) locks rec but not gap(LOCK_REC_NOT_GAP) waiting(LOCK_WAIT)
    
47. Record lock, heap no 27 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
48.  0: len 4; hex 8000001b; asc ;;
    
49.  1: len 6; hex 00000004eed4; asc ;;
    
50.  2: len 7; hex d3000002a10110; asc ;;
    
51.  3: len 7; hex 67616f70656e67; asc gaopeng;;
    
52. 
    
53. 
    
54. ---lock strcut(3):(Add by gaopeng) In modify Version I force check all REC_LOCK/TAB_LOCK for this Trx
    
55. RECORD LOCKS space id 434 page no 3 n bits 96 index PRIMARY of table `test`.`testlll` trx id 323283 lock_mode X(LOCK_X) locks rec but not gap(LOCK_REC_NOT_GAP)
    
56. Record lock, heap no 26 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
    
57.  0: len 4; hex 8000001a; asc ;;
    
58.  1: len 6; hex 00000004eed3; asc ;;
    
59.  2: len 7; hex d2000002330110; asc 3 ;;
    
60.  3: len 7; hex 67616f70656e67; asc gaopeng;;