当我尝试使用查询更新表时
UPDATE person.heroes
SET passwd = 'f662da7b9bd166ded69337a7f618da89'
WHERE heroes_id = 283703
该特定线程（3086C6）在锁定时等待，因为另一个线程（3086C0）具有相同的锁定。该表在heroes_id上的别名和主索引上是唯一的。我没有运行任何其他进程和“show processlist;”证实了这一点。
两个线程显示它们使用X锁定锁定在相同的数据项“283703”（即account_id并且是主索引）上。如何生成3086C0？
person.heroes上有一个触发器可以更新另一个表。
sql>show engine innodb status;
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 388, signal count 394
Mutex spin waits 128, rounds 1354, OS waits 39
RW-shared spins 365, rounds 10714, OS waits 345
RW-excl spins 0, rounds 144, OS waits 4
Spin rounds per wait: 10.58 mutex, 29.35 RW-shared, 144.00 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 3086C7
Purge done for trx's n:o < 3086B4 undo n:o < 0
History list length 1690
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 3086C3, not started
MySQL thread id 191, OS thread handle 0x7ff590948700, query id 48008 192.168.104.19 game
---TRANSACTION 3086C4, not started
MySQL thread id 192, OS thread handle 0x7ff58fd18700, query id 48012 192.168.104.19 game
---TRANSACTION 3079C4, not started
MySQL thread id 164, OS thread handle 0x7ff590885700, query id 44155 192.168.0.12 game
---TRANSACTION 308597, not started
MySQL thread id 167, OS thread handle 0x7ff5908c6700, query id 47224 192.168.0.12 game
---TRANSACTION 307FCF, not started
MySQL thread id 166, OS thread handle 0x7ff624054700, query id 45727 192.168.0.12 game
---TRANSACTION 307FC9, not started
MySQL thread id 163, OS thread handle 0x7ff590b91700, query id 45717 192.168.0.12 game
---TRANSACTION 307A1C, not started
MySQL thread id 155, OS thread handle 0x7ff62692d700, query id 45722 192.168.0.11 game
---TRANSACTION 3085ED, not started
MySQL thread id 146, OS thread handle 0x7ff590b50700, query id 47411 192.168.0.11 game
---TRANSACTION 308677, not started
MySQL thread id 130, OS thread handle 0x7ff590b0f700, query id 48016 localhost root
show engine innodb status
---TRANSACTION 303B8E, not started
MySQL thread id 125, OS thread handle 0x7ff590a4c700, query id 13780 localhost root
---TRANSACTION 308615, not started
MySQL thread id 122, OS thread handle 0x7ff590a8d700, query id 47458 192.168.0.11 game
---TRANSACTION 30865E, not started
MySQL thread id 120, OS thread handle 0x7ff590a0b700, query id 47545 192.168.0.11 game
---TRANSACTION 3086C6, ACTIVE 3 sec starting index read
mysql tables in use 1, locked 1
LOCK WAIT 2 lock struct(s), heap size 376, 1 row lock(s)
MySQL thread id 193, OS thread handle 0x7ff6268ec700, query id 48015 192.168.104.19 game Updating
UPDATE person.heroes
SET passwd = 'f662da7b9bd166ded69337a7f618da89'
WHERE heroes_id = 283703
Trx read view will not see trx with id >= 3086C7, sees < 3086C0
------- TRX HAS BEEN WAITING 3 SEC FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 783 page no 20 n bits 160 index `PRIMARY` of table `person`.`heroes` trx id 3086C6 lock_mode X locks rec but not gap waiting
Record lock, heap no 20 PHYSICAL RECORD: n_fields 29; compact format; info bits 0
0: len 4; hex 80045437; asc T7;;
1: len 6; hex 0000003086c0; asc 0 ;;
2: len 7; hex 25000002630e5d; asc % c ];;
3: len 3; hex 543120; asc T1 ;;
4: SQL NULL;
5: SQL NULL;
6: SQL NULL;
7: SQL NULL;
8: SQL NULL;
9: len 2; hex 494e; asc IN;;
10: SQL NULL;
11: SQL NULL;
12: len 28; hex 746573746f6965776e31323334406d61696c696e61746f722e636f6d; asc testoiewn1234@mailinator.com;;
13: len 13; hex 746573746f6965776e31323334; asc testoiewn1234;;
14: len 30; hex 346464376565616238306135633231663033303138666166366462666363; asc 4dd7eeab80a5c21f03018faf6dbfcc; (total 32 bytes);
15: SQL NULL;
16: SQL NULL;
17: SQL NULL;
18: SQL NULL;
19: SQL NULL;
20: len 1; hex 80; asc ;;
21: len 4; hex 80000000; asc ;;
22: len 6; hex 353030303831; asc 500081;;
23: SQL NULL;
24: len 1; hex 80; asc ;;
25: len 4; hex 80000200; asc ;;
26: len 3; hex 800000; asc ;;
27: len 1; hex 80; asc ;;
28: len 3; hex 494e52; asc INR;;
------------------
TABLE LOCK table `person`.`heroes` trx id 3086C6 lock mode IX
RECORD LOCKS space id 783 page no 20 n bits 160 index `PRIMARY` of table `person`.`heroes` trx id 3086C6 lock_mode X locks rec but not gap waiting
Record lock, heap no 20 PHYSICAL RECORD: n_fields 29; compact format; info bits 0
0: len 4; hex 80045437; asc T7;;
1: len 6; hex 0000003086c0; asc 0 ;;
2: len 7; hex 25000002630e5d; asc % c ];;
3: len 3; hex 543120; asc T1 ;;
4: SQL NULL;
5: SQL NULL;
6: SQL NULL;
7: SQL NULL;
8: SQL NULL;
9: len 2; hex 494e; asc IN;;
10: SQL NULL;
11: SQL NULL;
12: len 28; hex 746573746f6965776e31323334406d61696c696e61746f722e636f6d; asc testoiewn1234@mailinator.com;;
13: len 13; hex 746573746f6965776e31323334; asc testoiewn1234;;
14: len 30; hex 346464376565616238306135633231663033303138666166366462666363; asc 4dd7eeab80a5c21f03018faf6dbfcc; (total 32 bytes);
15: SQL NULL;
16: SQL NULL;
17: SQL NULL;
18: SQL NULL;
19: SQL NULL;
20: len 1; hex 80; asc ;;
21: len 4; hex 80000000; asc ;;
22: len 6; hex 353030303831; asc 500081;;
23: SQL NULL;
24: len 1; hex 80; asc ;;
25: len 4; hex 80000200; asc ;;
26: len 3; hex 800000; asc ;;
27: len 1; hex 80; asc ;;
28: len 3; hex 494e52; asc INR;;
---TRANSACTION 3086C0, ACTIVE 3 sec
3 lock struct(s), heap size 1248, 2 row lock(s), undo log entries 1
MySQL thread id 190, OS thread handle 0x7ff590ace700, query id 47999 192.168.104.19 game
TABLE LOCK table `person`.`heroes` trx id 3086C0 lock mode IX
RECORD LOCKS space id 783 page no 18 n bits 624 index `alias` of table `person`.`heroes` trx id 3086C0 lock_mode X locks rec but not gap
Record lock, heap no 508 PHYSICAL RECORD: n_fields 2; compact format; info bits 0
0: len 13; hex 746573746f6965776e31323334; asc testoiewn1234;;
1: len 4; hex 80045437; asc T7;;
RECORD LOCKS space id 783 page no 20 n bits 160 index `PRIMARY` of table `person`.`heroes` trx id 3086C0 lock_mode X locks rec but not gap
Record lock, heap no 20 PHYSICAL RECORD: n_fields 29; compact format; info bits 0
0: len 4; hex 80045437; asc T7;;
1: len 6; hex 0000003086c0; asc 0 ;;
2: len 7; hex 25000002630e5d; asc % c ];;
3: len 3; hex 543120; asc T1 ;;
4: SQL NULL;
5: SQL NULL;
6: SQL NULL;
7: SQL NULL;
8: SQL NULL;
9: len 2; hex 494e; asc IN;;
10: SQL NULL;
11: SQL NULL;
12: len 28; hex 746573746f6965776e31323334406d61696c696e61746f722e636f6d; asc testoiewn1234@mailinator.com;;
13: len 13; hex 746573746f6965776e31323334; asc testoiewn1234;;
14: len 30; hex 346464376565616238306135633231663033303138666166366462666363; asc 4dd7eeab80a5c21f03018faf6dbfcc; (total 32 bytes);
15: SQL NULL;
16: SQL NULL;
17: SQL NULL;
18: SQL NULL;
19: SQL NULL;
20: len 1; hex 80; asc ;;
21: len 4; hex 80000000; asc ;;
22: len 6; hex 353030303831; asc 500081;;
23: SQL NULL;
24: len 1; hex 80; asc ;;
25: len 4; hex 80000200; asc ;;
26: len 3; hex 800000; asc ;;
27: len 1; hex 80; asc ;;
28: len 3; hex 494e52; asc INR;;
--------
FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (read thread)
I/O thread 4 state: waiting for i/o request (read thread)
I/O thread 5 state: waiting for i/o request (read thread)
I/O thread 6 state: waiting for i/o request (write thread)
I/O thread 7 state: waiting for i/o request (write thread)
I/O thread 8 state: waiting for i/o request (write thread)
I/O thread 9 state: waiting for i/o request (write thread)
Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] ,
ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
1343 OS file reads, 6867 OS file writes, 2731 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.45 writes/s, 0.09 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 30 merges
merged operations:
insert 30, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 4425293, node heap has 17 buffer(s)
29.09 hash searches/s, 3.91 non-hash searches/s
---
LOG
---
Log sequence number 682871332
Log flushed up to 682871332
Last checkpoint at 682869899
0 pending log writes, 0 pending chkp writes
2311 log i/o's done, 0.45 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 2197815296; in additional pool allocated 0
Dictionary memory allocated 714369
Buffer pool size 131071
Free buffers 129785
Database pages 1269
Old database pages 488
Modified db pages 14
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 2, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 1228, created 41, written 4623
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1269, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
2 read views open inside InnoDB
Main thread process no. 1460, id 140692705335040, state: sleeping
Number of rows inserted 1366, updated 709, deleted 191, read 912575
0.09 inserts/s, 0.36 updates/s, 0.09 deletes/s, 33.72 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
|
+--------+------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCKS;
+------------------+-------------+-----------+-----------+--------------------+------------+------------+-----------+----------+-----------+
| lock_id | lock_trx_id | lock_mode | lock_type | lock_table | lock_index | lock_space | lock_page | lock_rec | lock_data |
+------------------+-------------+-----------+-----------+--------------------+------------+------------+-----------+----------+-----------+
| 3086C6:783:20:20 | 3086C6 | X | RECORD | `person`.`heroes` | `PRIMARY` | 783 | 20 | 20 | 283703 |
| 3086C0:783:20:20 | 3086C0 | X | RECORD | `person`.`heroes` | `PRIMARY` | 783 | 20 | 20 | 283703 |
+------------------+-------------+-----------+-----------+--------------------+------------+------------+-----------+----------+-----------+
2 rows in set (0.00 sec)
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_TRX\G
*************************** 1. row ***************************
trx_id: 3086C6
trx_state: LOCK WAIT
trx_started: 2013-06-27 15:28:46
trx_requested_lock_id: 3086C6:783:20:20
trx_wait_started: 2013-06-27 15:28:46
trx_weight: 2
trx_mysql_thread_id: 193
trx_query: UPDATE person.heroes
SET passwd = 'f662da7b9bd166ded69337a7f618da89'
WHERE heroes_id = 283703
trx_operation_state: starting index read
trx_tables_in_use: 1
trx_tables_locked: 1
trx_lock_structs: 2
trx_lock_memory_bytes: 376
trx_rows_locked: 1
trx_rows_modified: 0
trx_concurrency_tickets: 0
trx_isolation_level: REPEATABLE READ
trx_unique_checks: 1
trx_foreign_key_checks: 1
trx_last_foreign_key_error: NULL
trx_adaptive_hash_latched: 0
trx_adaptive_hash_timeout: 9999
*************************** 2. row ***************************
trx_id: 3086C0
trx_state: RUNNING
trx_started: 2013-06-27 15:28:46
trx_requested_lock_id: NULL
trx_wait_started: NULL
trx_weight: 4
trx_mysql_thread_id: 190
trx_query: NULL
trx_operation_state: NULL
trx_tables_in_use: 0
trx_tables_locked: 0
trx_lock_structs: 3
trx_lock_memory_bytes: 1248
trx_rows_locked: 2
trx_rows_modified: 1
trx_concurrency_tickets: 0
trx_isolation_level: REPEATABLE READ
trx_unique_checks: 1
trx_foreign_key_checks: 1
trx_last_foreign_key_error: NULL
trx_adaptive_hash_latched: 0
trx_adaptive_hash_timeout: 10000
2 rows in set (0.00 sec)
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCK_WAITS;
+-------------------+-------------------+-----------------+------------------+
| requesting_trx_id | requested_lock_id | blocking_trx_id | blocking_lock_id |
+-------------------+-------------------+-----------------+------------------+
| 3086C6 | 3086C6:783:20:20 | 3086C0 | 3086C0:783:20:20 |
+-------------------+-------------------+-----------------+------------------+
1 row in set (0.00 sec)
mysql版本是：5.5.31
任何人都可以光明点亮吗？
答案 0 :(得分：4)
另一个MySQL显然在一个事务中访问了相同的记录或一个接近它的记录，并在其上打开了一个记录锁，阻止其他线程修改记录，直到事务被提交或回滚为止。
要确定另一个mysql主题，你已经走上了正确的轨道：
SELECT * FROM INFORMATION_SCHEMA.INNODB_TRX\G
将显示您阻止的InnoDB事务（上例中的30250F）和另一个事务（302509）。检查mysql进程/线程列表：
show processlist;
每个线程都有一个线程ID：
mysql> show processlist;
+------------+---------+--------------------+------+-------------+---------+-----------------------------------------------------------------------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+------------+---------+--------------------+------+-------------+---------+-----------------------------------------------------------------------+------------------+
| 112 | myuser | localhost | mydb | Sleep | 95 | | NULL |
并且阻止事务的线程ID（112）在trx_mysql_thread_id列表中显示为INNODB_TRX。
如果您现在使用kill 112;命令终止线程112，则应回滚其事务（其当前事务中所做的任何更改将被还原），锁被释放，被阻塞的线程应该是能够继续。
正如你在评论中所说的那样，那个线程现在可能正在休眠：它已经修改了一行（trx_rows_modified：1），导致两行被锁定（trx_rows_locked：2），其中一行是你的行'现在重新尝试修改。它还没有提交交易，这就是锁仍然存在的原因。
至于真正的修复：您的应用程序应在每次交易后执行COMMIT;。如果您不使用事务并且不希望立即学习它们，则可能需要在连接到数据库之后和执行任何操作之前使用SET autocommit=1;启用自动提交。默认情况下，MySQL启用了自动提交，因此您可能还在使用代码中禁用它。请注意，您必须为每个连接单独执行此操作。
启用自动提交时，如果您只发出简单语句，则不需要COMMIT，但您仍然可以通过发出BEGIN或START TRANSACTION命令显式启动事务，在这种情况下您需要使用COMMIT或ROLLBACK来终止它。检查您的代码是否为BEGIN或START TRANSACTION语句，如果您没有执行COMMIT，请将其删除。
自动提交也可以作为全局选项（how to set autocommit false globally）进行调整，但随后您的应用程序将依赖于具有该设置的数据库服务器配置。
使用交易时，您必须确保在操作结束时始终执行其中一项操作：
对于Web服务上的持久连接，意外关闭的HTTP客户端连接可能会在没有提交或回滚的情况下终止脚本执行，并在交易过程中保持连接处于打开状态。
相关问题，交易基本介绍： What is a database transaction?