我正在使用 MAMP 和 codeigniter 框架。
我面临一个非常奇怪的问题。我写的有一个活动记录语句。
$this->db->select('user_vcard.pro_pic_filename AS `author_pro_pic_filepath`');
如果我AS author_pro_pic_filepath在 CI 语句中使用，在执行 HTTP 请求后，我会收到一个 SERVER ERROR。然后，如果我尝试刷新页面，我的浏览器会停顿很长时间，然后，在某一时刻，它说
Error Number: 1205.
Lock wait timeout exceeded; try restarting transaction
但是，如果我AS author_pro_pic_filepath用任何其他名称替换，它就可以正常工作。
以下是我试图解决问题的方法：
- 我导出了数据库的 .sql 转储并将其保存在安全的地方
- 我尝试删除所有表。
- 我尝试删除整个数据库。
- 我从表中清除了所有 MySQL 用户权限
- 我从浏览器中清除了所有 cookie、会话数据
- 我在 Safari 和 Chrome 上都试过了
- 我尝试关闭 MAMP。
- 我试着关闭我的笔记本电脑。
- 我试着一起做以上所有事情。
- 我还尝试关闭我的 codeigniter 代码中的所有事务语句。
结果没有变化。它总是表现得像我上面提到的那样。
我在我的应用程序的其他几个文件中使用了相同的活动记录语句。到处都运行良好。但只有在这个 ONE 特定文件中，我才面临上述问题。
SQL查询结果：SHOW ENGINE INNODB MUTEX；
Rows: 2
Type InnoDB
Name /users/severin/MAMPexp/MAMP_packages/mysql-5.5.9/storage/innobase/srv/srv0srv.c:1030
Status os_waits=1
Type InnoDB
Name /users/severin/MAMPexp/MAMP_packages/mysql-5.5.9/storage/innobase/log/log0log.c:832
Status os_waits=7
SQL查询结果：SHOW ENGINE INNODB MUTEX；
Rows: 1
Type InnoDB
Name
Status
=====================================
120426 18:39:04 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 5 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 56 1_second, 56 sleeps, 5 10_second, 8 background, 8 flush
srv_master_thread log flush and writes: 57
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 8, signal count 8
Mutex spin waits 2, rounds 31, OS waits 1
RW-shared spins 7, rounds 210, OS waits 7
RW-excl spins 0, rounds 0, OS waits 0
Spin rounds per wait: 15.50 mutex, 30.00 RW-shared, 0.00 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 8BCB
Purge done for trx's n:o < 8BBD undo n:o < 0
History list length 149
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started, OS thread id 4531712000
MySQL thread id 55, query id 926 localhost root
SHOW ENGINE INNODB STATUS
---TRANSACTION 8BBB, not started, OS thread id 4531163136
MySQL thread id 44, query id 820 localhost doc2doc
---TRANSACTION 8BBD, ACTIVE 486 sec, OS thread id 4531437568
3 lock struct(s), heap size 376, 2 row lock(s), undo log entries 1
MySQL thread id 45, query id 831 localhost doc2doc
Trx read view will not see trx with id >= 8BBE, sees < 8BBE
--------
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
413 OS file reads, 520 OS file writes, 381 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 276707, node heap has 1 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 5050799
Log flushed up to 5050799
Last checkpoint at 5050799
0 pending log writes, 0 pending chkp writes
370 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 137363456; in additional pool allocated 0
Dictionary memory allocated 114130
Buffer pool size 8192
Free buffers 7736
Database pages 455
Old database pages 0
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 402, created 53, written 322
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
LRU len: 455, 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 id 4506259456, state: waiting for server activity
Number of rows inserted 507, updated 2, deleted 0, read 1679
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================