Lock wait timeout exceeded; try restarting transaction

可供参考的网址：

http://blog.itpub.net/195110/viewspace-1080898/

You should consider increasing the lock wait timeout value for InnoDB by setting theinnodb_lock_wait_timeout, default is 50 sec

mysql> show variables like 'innodb_lock_wait_timeout';+--------------------------+-------+| Variable_name            | Value |+--------------------------+-------+| innodb_lock_wait_timeout | 50    |+--------------------------+-------+1 row in set (0.01 sec)

You can set it to higher value in /etc/my.cnf permanently with this line

[mysqld]innodb_lock_wait_timeout=120

and restart mysql. If you cannot restart mysql at this time, run this:

SET GLOBAL innodb_lock_wait_timeout = 120; 

You could also just set it for the duration of your session

SET innodb_lock_wait_timeout = 120;