今天在用mysql的innodb引擎时突然出现InnoDB registration as a STORAGE ENGINE failed.Unknown/unsupported table type: innodb.系统变得无法正常启动了，经过分析做个记录以借再次碰到此类问题的同学参考。
前几天，启动时，突然报1067系统错误，死活无法启动。
当时不管三七二十八，重装，清空注册表，重启，任然没办法启动。
总是在安装后的配置那里最后一步启动服务的界面卡死，半天没反应。
折腾了两三个小时，才猛然想起，该去看看日志，
110223 15:58:08 [Note] Plugin 'FEDERATED' is disabled.
110223 15:58:08 InnoDB: Initializing buffer pool, size = 17.0M
110223 15:58:08 InnoDB: Completed initialization of buffer pool
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/5.1/en/error-creating-innodb.html
110223 15:58:08 [ERROR] Plugin 'InnoDB' init function returned error.
110223 15:58:08 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
110223 15:58:08 [ERROR] Unknown/unsupported table type: innodb
110223 15:58:08 [ERROR] Aborting
大意是innodb初始化失败，不认识innodb类型。
google了一下，把my.ini文件打开，更改default-storage-engine=innodb为default-storage-engine=myism
启动成功。但是建表时找不到innodb引擎了。
但想着，也不能老这样啊，这样innodb也用不了了，有google了一下，主要是innodb日志大小不对造成的
innodb_buffer_pool_size=512M
innodb_log_file_size=128M
把以上几个参数调大点，然后把ibdata1，ib_logfile0，ib_logfile1这三个文件删除后，再重启服务就好了。
如果还是不行，在my.ini文件里还需要加入tmpdir="usr/tmp"这样的路径，因为innodb还需要一个临时的文件缓存区。
还遇到的问题是密码正确，但GUI工具无法登陆，可以先用配置程序修改密码，然后在命令行下登陆刷新权限就可以了。flush privilege.
记录下来，仅供遇到此类问题的同学参考。
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