Lock wait timeout exceeded

查询 正在执行的事务：
SELECT * FROM information_schema.INNODB_TRX
查看正在锁的事务
SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCKS;
查看等待锁的事务
SELECT * FROM INFORMATION_SCHEMA.INNODB_LOCK_WAITS;

参考文档:
http://blog.csdn.net/u011375296/article/details/51427985