ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
前言：朋友咨询我说执行简单的update语句失效，症状如下：
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远程过去，开始check
1，查看数据库的隔离级别：
mysql> select @@tx_isolation;
+-----------------+
| @@tx_isolation |
+-----------------+
| REPEATABLE-READ |
+-----------------+
1 row in set (0.00 sec)
mysql>
2，去查看先当前库的线程情况：
mysql> show full processlist;
+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+
| 1 | event_scheduler | localhost | NULL | Daemon | 9635385 | Waiting on empty queue | 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 |
......
+----------+-----------------+-------------------+-----------------+-------------+---------+-------------------------+-----------------------+
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，看到有这条9930577的sql，，kill掉，执行kill 9930577;
mysql> kill 9930577;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> SELECT * FROM INNODB_TRX\G;
Empty set (0.00 sec)
ERROR:
No query specified
mysql>
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
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