查看日志 data/XXX.err
发现如下错误
[ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace mysql/innodb_index_stats uses space ID: 2 at filepath: .mysqlinnodb_index_stats.ibd. Cannot open tablespace mydatabase/blackboard which uses space ID: 2 at filepath: . um_mitfahrer_applackboard.ibd InnoDB: Error: could not open single-table tablespace file . um_mitfahrer_applackboard.ibd InnoDB: We do not continue the crash recovery, because the table may become InnoDB: corrupt if we cannot apply the log records in the InnoDB log to it. InnoDB: To fix the problem and start mysqld: InnoDB: 1) If there is a permission problem in the file and mysqld cannot InnoDB: open the file, you should modify the permissions. InnoDB: 2) If the table is not needed, or you can restore it from a backup, InnoDB: then you can remove the .ibd file, and InnoDB will do a normal InnoDB: crash recovery and ignore that table. InnoDB: 3) If the file system or the disk is broken, and you cannot remove InnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnf InnoDB: and force InnoDB to continue crash recovery here.
解决方法：
在配置文件my.ini里添加如下
[mysqld] innodb_force_recovery = 1
启动mysql服务成功了！
但是。。。在查询一些表时却出错提示：
Table 'XXX' doesn't exist
FUCK!
再改my.ini ：
innodb_force_recovery = 0
是的！要再改为0！然后再重启mysql服务！
可以了！妈蛋啊~~~！！
差点毁了客户的数据，卧槽！搞了一天！！