ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction 表被锁的解决办法

转自：https://blog.csdn.net/mchdba/article/details/38313881

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                  |

|  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                  |
......

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

没有看到正在执行的慢SQL记录线程，再去查看innodb的事务表INNODB_TRX，看下里面是否有正在锁定的事务线程，看看ID是否在show full processlist里面的sleep线程中，如果是，就证明这个sleep的线程事务一直没有commit或者rollback而是卡住了，我们需要手动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，看到有这条9930577的sql，kill掉，执行kill 9930577;

mysql> kill 9930577;

Query OK, 0 rows affected (0.00 sec)

mysql>

然后再去查询INNODB_TRX表，就没有阻塞的事务sleep线程存在了，如下所示：

mysql> SELECT * FROM INNODB_TRX\G;

Empty set (0.00 sec)

ERROR:

No query specified

mysql>

再去执行update语句，就能正常执行了，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，总结分析
表数据量也不大，按照普通的情况来说，简单的update应该不会造成阻塞的，mysql都是autocommit，不会出现update卡住的情况，去查看下autocommit的值。
mysql> select @@autocommit;
+--------------+
| @@autocommit |
+--------------+
|            0 |
+--------------+
1 row in set (0.00 sec)

mysql>

看到亮闪闪的0，这个设置导致原来的update语句如果没有commit的话，你再重新执行update语句，就会等待锁定，当等待时间过长的时候，就会报ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction的错误。
所以赶紧commit刚才执行的update语句，之后 set global autocommit=1;