MySQL死锁分析一例
Tomcat日志报死锁错误，show innodb status获取死锁信息：
------------------------
LATEST DETECTED DEADLOCK
------------------------
181107 9:30:46
*** (1) TRANSACTION:
TRANSACTION 2067C318, ACTIVE 16 sec fetching rows
mysql tables in use 1, locked 1
LOCK WAIT 2183 lock struct(s), heap size 407992, 145 row lock(s), undo log entries 8
MySQL thread id 20259, OS thread handle 0x189c, query id 276602977 localhost 127.0.0.1 root updating
delete from a93 where patientId=164136 and count=9
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 4609 page no 4 n bits 136 index `PRIMARY` of table `emr_new2`.`a93` trx id 2067C318 lock_mode X locks rec but not gap waiting
Record lock, heap no 4 PHYSICAL RECORD: n_fields 71; compact format; info bits 0
0: len 4; hex 00000003; asc ;;
1: len 6; hex 000010d0240c; asc $ ;;
2: len 7; hex 9b000023d70110; asc # ;;
3: len 2; hex 3630; asc 60;;
4: len 1; hex 31; asc 1;;
5: len 8; hex d2f2c0bbceb2d1d7; asc ;;
6: len 10; hex d0d0c0bbceb2c7d0b3fd; asc ;;
7: len 0; hex ; asc ;;
8: len 1; hex 32; asc 2;;
9: len 0; hex ; asc ;;
10: len 0; hex ; asc ;;
11: len 0; hex ; asc ;;
12: len 0; hex ; asc ;;
13: len 0; hex ; asc ;;
14: len 0; hex ; asc ;;
15: len 0; hex ; asc ;;
16: len 0; hex ; asc ;;
17: len 0; hex ; asc ;;
18: len 0; hex ; asc ;;
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20: len 0; hex ; asc ;;
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22: len 0; hex ; asc ;;
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27: len 0; hex ; asc ;;
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31: len 0; hex ; asc ;;
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36: len 0; hex ; asc ;;
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38: len 0; hex ; asc ;;
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42: len 0; hex ; asc ;;
43: len 0; hex ; asc ;;
44: len 0; hex ; asc ;;
45: len 0; hex ; asc ;;
46: len 0; hex ; asc ;;
47: len 0; hex ; asc ;;
48: len 0; hex ; asc ;;
49: len 0; hex ; asc ;;
50: len 0; hex ; asc ;;
51: len 0; hex ; asc ;;
52: len 0; hex ; asc ;;
53: len 0; hex ; asc ;;
54: len 0; hex ; asc ;;
55: SQL NULL;
56: len 1; hex 30; asc 0;;
57: len 1; hex 30; asc 0;;
58: len 1; hex 6e; asc n;;
59: len 4; hex 80000a40; asc @;;
60: len 4; hex 80000000; asc ;;
61: len 2; hex 3020; asc 0 ;;
62: len 0; hex ; asc ;;
63: len 20; hex 3020202020202020202020202020202020202020; asc 0 ;;
64: len 6; hex 6e2020202020; asc n ;;
65: len 4; hex 59f974ee; asc Y t ;;
66: len 2; hex 3931; asc 91;;
67: len 6; hex cdf5bed5c7ef; asc ;;
68: len 30; hex 3230c4eac7b0d2f2d3d2b1c7b2e0c6a4b7f4bbf9b5d7cfb8b0fbb0a9a3ac; asc 20 ; (total 114 bytes);
69: len 0; hex ; asc ;;
70: len 4; hex 80000001; asc ;; *** (2) TRANSACTION:
TRANSACTION 2067C43F, ACTIVE 7 sec fetching rows, thread declared inside InnoDB 424
mysql tables in use 1, locked 1
2223 lock struct(s), heap size 440760, 192 row lock(s), undo log entries 8
MySQL thread id 20135, OS thread handle 0xf28, query id 276602976 localhost 127.0.0.1 root updating
delete from a93 where patientId=164136 and count=9
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 4609 page no 4 n bits 136 index `PRIMARY` of table `emr_new2`.`a93` trx id 2067C43F lock_mode X locks rec but not gap
Record lock, heap no 4 PHYSICAL RECORD: n_fields 71; compact format; info bits 0
0: len 4; hex 00000003; asc ;;
1: len 6; hex 000010d0240c; asc $ ;;
2: len 7; hex 9b000023d70110; asc # ;;
3: len 2; hex 3630; asc 60;;
4: len 1; hex 31; asc 1;;
5: len 8; hex d2f2c0bbceb2d1d7; asc ;;
6: len 10; hex d0d0c0bbceb2c7d0b3fd; asc ;;
7: len 0; hex ; asc ;;
8: len 1; hex 32; asc 2;;
9: len 0; hex ; asc ;;
10: len 0; hex ; asc ;;
11: len 0; hex ; asc ;;
12: len 0; hex ; asc ;;
13: len 0; hex ; asc ;;
14: len 0; hex ; asc ;;
15: len 0; hex ; asc ;;
16: len 0; hex ; asc ;;
17: len 0; hex ; asc ;;
18: len 0; hex ; asc ;;
19: len 0; hex ; asc ;;
20: len 0; hex ; asc ;;
21: len 0; hex ; asc ;;
22: len 0; hex ; asc ;;
23: len 0; hex ; asc ;;
24: len 0; hex ; asc ;;
25: len 0; hex ; asc ;;
26: len 0; hex ; asc ;;
27: len 0; hex ; asc ;;
28: len 0; hex ; asc ;;
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31: len 0; hex ; asc ;;
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39: len 0; hex ; asc ;;
40: len 0; hex ; asc ;;
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42: len 0; hex ; asc ;;
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44: len 0; hex ; asc ;;
45: len 0; hex ; asc ;;
46: len 0; hex ; asc ;;
47: len 0; hex ; asc ;;
48: len 0; hex ; asc ;;
49: len 0; hex ; asc ;;
50: len 0; hex ; asc ;;
51: len 0; hex ; asc ;;
52: len 0; hex ; asc ;;
53: len 0; hex ; asc ;;
54: len 0; hex ; asc ;;
55: SQL NULL;
56: len 1; hex 30; asc 0;;
57: len 1; hex 30; asc 0;;
58: len 1; hex 6e; asc n;;
59: len 4; hex 80000a40; asc @;;
60: len 4; hex 80000000; asc ;;
61: len 2; hex 3020; asc 0 ;;
62: len 0; hex ; asc ;;
63: len 20; hex 3020202020202020202020202020202020202020; asc 0 ;;
64: len 6; hex 6e2020202020; asc n ;;
65: len 4; hex 59f974ee; asc Y t ;;
66: len 2; hex 3931; asc 91;;
67: len 6; hex cdf5bed5c7ef; asc ;;
68: len 30; hex 3230c4eac7b0d2f2d3d2b1c7b2e0c6a4b7f4bbf9b5d7cfb8b0fbb0a9a3ac; asc 20 ; (total 114 bytes);
69: len 0; hex ; asc ;;
70: len 4; hex 80000001; asc ;; *** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 4609 page no 5 n bits 144 index `PRIMARY` of table `emr_new2`.`a93` trx id 2067C43F lock_mode X locks rec but not gap waiting
Record lock, heap no 36 PHYSICAL RECORD: n_fields 71; compact format; info bits 0
0: len 4; hex 00000068; asc h;;
1: len 6; hex 000010fb7bde; asc { ;;
2: len 7; hex 4a000040381ed0; asc J @8 ;;
3: len 0; hex ; asc ;;
4: len 0; hex ; asc ;;
5: len 0; hex ; asc ;;
6: len 0; hex ; asc ;;
7: len 0; hex ; asc ;;
8: len 1; hex 33; asc 3;;
9: len 0; hex ; asc ;;
10: len 0; hex ; asc ;;
11: len 0; hex ; asc ;;
12: len 0; hex ; asc ;;
13: len 0; hex ; asc ;;
14: len 0; hex ; asc ;;
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16: len 0; hex ; asc ;;
17: len 0; hex ; asc ;;
18: len 0; hex ; asc ;;
19: len 0; hex ; asc ;;
20: len 0; hex ; asc ;;
21: len 12; hex bfd5b8b9d1aaccc7cadccbf0; asc ;;
22: len 1; hex 33; asc 3;;
23: len 4; hex c4ead3e0; asc ;;
24: len 10; hex ceb4d3c3d2a9d6cec1c6; asc ;;
25: len 0; hex ; asc ;;
26: len 0; hex ; asc ;;
27: len 0; hex ; asc ;;
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30: len 0; hex ; asc ;;
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42: len 0; hex ; asc ;;
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44: len 0; hex ; asc ;;
45: len 0; hex ; asc ;;
46: len 0; hex ; asc ;;
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48: len 0; hex ; asc ;;
49: len 0; hex ; asc ;;
50: len 0; hex ; asc ;;
51: len 0; hex ; asc ;;
52: len 0; hex ; asc ;;
53: len 0; hex ; asc ;;
54: len 0; hex ; asc ;;
55: SQL NULL;
56: len 1; hex 30; asc 0;;
57: len 1; hex 30; asc 0;;
58: len 1; hex 6e; asc n;;
59: len 4; hex 80000876; asc v;;
60: len 4; hex 80000000; asc ;;
61: len 2; hex 3020; asc 0 ;;
62: len 0; hex ; asc ;;
63: len 20; hex 3020202020202020202020202020202020202020; asc 0 ;;
64: len 6; hex 6e2020202020; asc n ;;
65: len 4; hex 5a1a2d94; asc Z - ;;
66: len 4; hex 31373133; asc 1713;;
67: len 6; hex d5c5d1debaec; asc ;;
68: len 9; hex 756e646566696e6564; asc undefined;;
69: len 3; hex 313435; asc 145;;
70: len 4; hex 80000001; asc ;; *** WE ROLL BACK TRANSACTION (1)
TRANSACTION 2067C318, ACTIVE 16 sec fetching rows
mysql tables in use 1, locked 1
LOCK WAIT 2183 lock struct(s), heap size 407992, 145 row lock(s), undo log entries 8
MySQL thread id 20259, OS thread handle 0x189c, query id 276602977 localhost 127.0.0.1 root updating
delete from a93 where patientId=164136 and count=9
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 4609 page no 4 n bits 136 index `PRIMARY` of table `emr_new2`.`a93` trx id 2067C318 lock_mode X locks rec but not gap waiting
Record lock, heap no 4 PHYSICAL RECORD: n_fields 71; compact format; info bits 0
*** (2) TRANSACTION:
TRANSACTION 2067C43F, ACTIVE 7 sec fetching rows, thread declared inside InnoDB 424
mysql tables in use 1, locked 1
2223 lock struct(s), heap size 440760, 192 row lock(s), undo log entries 8
MySQL thread id 20135, OS thread handle 0xf28, query id 276602976 localhost 127.0.0.1 root updating
delete from a93 where patientId=164136 and count=9
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 4609 page no 4 n bits 136 index `PRIMARY` of table `emr_new2`.`a93` trx id 2067C43F lock_mode X locks rec but not gap
Record lock, heap no 4 PHYSICAL RECORD: n_fields 71; compact format; info bits 0
可以看到两个事务 TRANSACTION 2067C318 和 TRANSACTION 2067C43F 分别执行： delete from a93 wehre patientId=164136 and count=9
导致了相互等待。
查看表结构和数据量，发现 patientId未加索引，数据量很大，导致delete语句会全表扫描，容易长时间持有锁。
加上索引： alter table a93 add index patientId(patientId);
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