Lock wait timeout exceeded; try restarting transaction解决方案

今天程序里报的错： java.sql.BatchUpdateException: Lock wait timeout exceeded; try restarting transaction，重启服务后也没有效果，然后查看mysql官方文档如下：

Error: 1205 SQLSTATE: HY000 (ER_LOCK_WAIT_TIMEOUT)
Message: Lock wait timeout exceeded; try restarting transaction
InnoDB reports this error when lock wait timeout expires. The statement that waited too long was rolled back (not the entiretransaction). You can increase the value of the innodb_lock_wait_timeout configuration option if SQL statements should wait longer for other transactions to complete, or decrease it if too many long-running transactions are causing locking problems and reducing concurrency on a busy system.

翻译如下：
当锁等待超时后innodb引擎报此错误，等待时间过长的语句被回滚（不是整个事务）。如果想让SQL语句等待其他事务更长时间之后完成，你可以增加参数innodb_lock_wait_timeout配置的值。如果有太多长时间运行的有锁的事务，你可以减小这个innodb_lock_wait_timeout的值，在特别繁忙的系统，你可以减小并发。
The length of time in seconds an InnoDB transaction waits for a row lock before giving up. The default value is 50 seconds. A transaction that tries to access a row that is locked by another InnoDB transaction waits at most this many seconds for write access to the row before issuing the following error:
ERROR 1205 (HY000):Lock wait timeout exceeded; try restarting transaction
InnoDB事务等待一个行级锁的时间最长时间（单位是秒），超过这个时间就会放弃。默认值是50秒。一个事务A试图访问一行数据，但是这行数据正在被另一个innodb事务B锁定，此时事务A就会等待事务B释放锁，等待超过innodb_lock_wait_timeout设置的值就会报错ERROR 1205 (HY000)：

于是我尝试调大innodb_lock_wait_timeout参数：
具体操作：如下可知innodb_lock_wait_timeout是动态参数,默认值50秒，最小值是1秒，最大值是1073741824；

mysql> set GLOBAL innodb_lock_wait_timeout=1500；
(题外话：关于setinnodb_lock_wait_timeout=1500; 和 set global innodb_lock_wait_timeout=1500;的区别。前者等价于set session只影响当前session，后者作为全局的修改方式，只会影响修改之后打开的session；注意后者不能改变当前session；）

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