innodb_log_file_size = 100M
innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend
innodb_log_group_home_dir = /usr/local/mysql/var/为什么设置了以上3个参数任何一个以上之后，mysql重启，用
show engines;就看不到innodb信息了呢？
innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend
innodb_log_group_home_dir = /usr/local/mysql/var/为什么设置了以上3个参数任何一个以上之后，mysql重启，用
show engines;就看不到innodb信息了呢？
110121 19:37:01 [Note] /usr/local/mysql/libexec/mysqld: Normal shutdown110121 19:37:01 [Note] Event Scheduler: Purging the queue. 0 events
110121 19:37:01 InnoDB: Starting shutdown...
110121 19:37:02 InnoDB: Shutdown completed; log sequence number 0 3920072339
110121 19:37:03 [Note] /usr/local/mysql/libexec/mysqld: Shutdown complete110121 19:37:03 mysqld_safe mysqld from pid file /usr/local/mysql/var//mysql.chinascopefinanical.com.pid ended
110121 19:37:03 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var/
110121 19:37:04 [Note] Plugin 'FEDERATED' is disabled.
110121 19:37:04 [Note] Plugin 'ndbcluster' is disabled.
InnoDB: Error: data file /usr/local/mysql/var/ibdata1 is of a different size
InnoDB: 49792 pages (rounded down to MB)
InnoDB: than specified in the .cnf file 128000 pages!
InnoDB: Could not open or create data files.
InnoDB: If you tried to add new data files, and it failed here,
InnoDB: you should now edit innodb_data_file_path in my.cnf back
InnoDB: to what it was, and remove the new ibdata files InnoDB created
InnoDB: in this failed attempt. InnoDB only wrote those files full of
InnoDB: zeros, but did not yet use them in any way. But be careful: do not
InnoDB: remove old data files which contain your precious data!
110121 19:37:04 [ERROR] Plugin 'InnoDB' init function returned error.
110121 19:37:04 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
110121 19:37:04 [Note] Event Scheduler: Loaded 0 events
110121 19:37:04 [Note] /usr/local/mysql/libexec/mysqld: ready for connections.
Version: '5.1.41-log' socket: '/usr/local/mysql/tmp/mysql.sock' port: 3306 Source distribution
你是自己build的mysql吗？
这儿不是很清楚吗？
如果你的INNODB中的数据不需要，则你可以直接删除 ibdata*, ib_logfile*, 然后重启。
不太可能,只有参数太大,超出了系统的限制,会使得show engines 里面的存储引擎变成no
可以这样理解，log 和ibdata等任何表空间文件，就是innodb自家私有的分区格式文件。
你把innodb的家都搞乱了，【打砸】坏了，它自然没法干活，整个服务器没停就不错了。1备份所有innodb库表，关闭服务器。
2删除所有innodb表空间文件。
3设置新的参数，启动服务器。----这时才会按配置文件，生成新的表空间。