. . 在MySQL的配置文件中，设定default-table-type=InnoDB，发现MySQL无法正常的启动，错误日志中给出了如下的信息：
150210 18:11:19 mysqld_safe mysqld from pid file /data/mysqldata/mysql.pid ended
150210 18:15:20 mysqld_safe Starting mysqld daemon with databases from /data/mysqldata
150210 18:15:20 InnoDB: The InnoDB memory heap is disabled
150210 18:15:20 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150210 18:15:20 InnoDB: Compressed tables use zlib 1.2.3
150210 18:15:20 InnoDB: Initializing buffer pool, size = 128.0M
150210 18:15:20 InnoDB: Completed initialization of buffer pool
150210 18:15:20 InnoDB: highest supported file format is Barracuda.
InnoDB: No valid checkpoint found.
InnoDB: If this error appears when you are creating an InnoDB database,
InnoDB: the problem may be that during an earlier attempt you managed
InnoDB: to create the InnoDB data files, but log file creation failed.
InnoDB: If that is the case, please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.5/en/error-creating-innodb.html
150210 18:15:20 [ERROR] Plugin 'InnoDB' init function returned error.
150210 18:15:20 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
150210 18:15:20 [ERROR] Unknown/unsupported storage engine: InnoDB
150210 18:15:20 [ERROR] Aborting
在网上查找后，只要删除MySQL目录下的ib_logfile0和ib_logfile1和ibdata1就可以了，只删除前两个还是不行，得都删除才可以，我测试的时候是这样