数据库迁移后，连接数据库突然报错：
ERROR 1286 (42000): Unknown table engine 'InnoDB'
于是查看数据库引擎。
show engines;
发现竟然没有了Innodb引擎
+------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+------------+---------+----------------------------------------------------------------+--------------+------+------------+
| MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | NO | NO | NO |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
+------------+---------+----------------------------------------------------------------+--------------+------+------------+
Innodb数据库引擎应该是好的，应该是日志错误导致的，于是删掉数据库目录下的ib_logfile*文件(ibdata不要删，千万不要删错了！)，然后重启数据库，一切恢复正常。
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