前言：朋友咨詢我說執行簡單的update語句失效，癥狀如下：
mysql>?update?order_info??set?province_id=15??,city_id=?1667??where?order_from=10?and?order_out_sn='1407261241xxxx';
ERROR?1205?(HY000):?Lock?wait?timeout?exceeded;?try?restarting?transaction
mysql>?

QQ遠程過去，開始check
1，查看數據庫的隔離級別：

mysql>?select?@@tx_isolation;
+-----------------+
|?@@tx_isolation??|
+-----------------+
|?REPEATABLE-READ?|
+-----------------+
1?row?in?set?(0.00?sec)

mysql>?

?
2，去查看先當前庫的線程情況：

mysql> show full processlist;

+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+

| Id?????? | User??????????? | Host????????????? | db????????????? | Command???? | Time??? | State?????????????????? | Info????????????????? |

+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+

|??????? 1 | event_scheduler | localhost???????? | NULL??????????? | Daemon????? | 9635385 | Waiting on empty queue? | NULL????????????????? |

|??9930577?| business_web??? | 192.168.1.21:45503 | business_db???? | Sleep?????? |???? 153 |???????????????????????? | NULL????????????????? |

|? 9945825 | business_web??? | 192.168.1.25:49518 | business_db???? | Sleep?????? |????? 43 |???????????????????????? | NULL????????????????? |

|? 9946322 | business_web??? | 192.168.1.23:44721 | business_db???? | Sleep?????? |???? 153 |???????????????????????? | NULL????????????????? |

|? 9960167 | business_web??? | 192.168.3.28:2409? | business_db???? | Sleep?????? |????? 93 |???????????????????????? | NULL????????????????? |

|? 9964484 | business_web??? | 192.168.1.21:24280 | business_db???? | Sleep?????? |?????? 7 |???????????????????????? | NULL????????????????? |

|? 9972499 | business_web?? ?| 192.168.3.28:35752 | business_db???? | Sleep?????? |????? 13 |???????????????????????? | NULL????????????????? |

| 10000117 | business_web??? | 192.168.3.28:9149? | business_db???? | Sleep?????? |?????? 6 |???????????????????????? | NULL????????????????? |

| 10002523 | business_web??? | 192.168.3.29:42872 | business_db???? | Sleep?????? |?????? 6 |???????????????????????? | NULL????????????????? |

| 10007545 | business_web??? | 192.168.1.21:51379 | business_db???? | Sleep?????? |???? 155 |?????????????????? ??????| NULL????????????????? |
......

+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+

?

沒有看到正在執行的慢SQL記錄線程，再去查看innodb的事務表INNODB_TRX，看下里面是否有正在鎖定的事務線程，看看ID是否在show full processlist里面的sleep線程中，如果是，就證明這個sleep的線程事務一直沒有commit或者rollback而是卡住了，我們需要手動kill掉。

?

mysql> SELECT * FROM information_schema.INNODB_TRX\G;

*************************** 1. row ***************************

??????????????????? trx_id: 20866

???????????????? trx_state: LOCK WAIT

?????????????? trx_started: 2014-07-31 10:42:35

???? trx_requested_lock_id: 20866:617:3:3

????????? trx_wait_started: 2014-07-30 10:42:35

??????????????? trx_weight: 2

?????? trx_mysql_thread_id:?9930577

???????????????? trx_query: delete from dltask where id=1

?????? 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: READ COMMITTED

???????? 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

????????? trx_is_read_only: 0

trx_autocommit_non_locking: 0

?

3，看到有這條9930577的sql，kill掉，執行kill 9930577;

mysql> kill 9930577;

Query OK, 0 rows affected (0.00 sec)

?

mysql>

?

然后再去查詢INNODB_TRX表，就沒有阻塞的事務sleep線程存在了，如下所示：

mysql> SELECT * FROM INNODB_TRX\G;

Empty set (0.00 sec)

?

ERROR:

No query specified

?

mysql>

再去執行update語句，就能正常執行了，如下所示：

mysql> update order_info? set province_id=15? ,city_id= 1667? where order_from=10 and order_out_sn='1407261241xxxx';

Query OK, 1 row affected (0.00 sec)

Rows matched: 1? Changed: 1? Warnings: 0

?

mysql>

4，總結分析
表數據量也不大，按照普通的情況來說，簡單的update應該不會造成阻塞的，mysql都是autocommit，不會出現update卡住的情況，去查看下autocommit的值。
mysql> select @@autocommit;
+--------------+
| @@autocommit |
+--------------+
| ? ? ? ? ???0?|
+--------------+
1 row in set (0.00 sec)


mysql>

看到亮閃閃的0，這個設置導致原來的update語句如果沒有commit的話，你再重新執行update語句，就會等待鎖定，當等待時間過長的時候，就會報ERROR?1205?(HY000):?Lock?wait?timeout?exceeded;?try?restarting?transaction的錯誤。
所以趕緊commit剛才執行的update語句，之后 set global?autocommit=1;

來自：http://blog.itpub.net/26230597/viewspace-1242948/

總結

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