冷备份指冷备份发生在数据库已经正常关闭的情况下，当正常关闭时会提供给我们一个完整的数据库。冷备份是将关键性文件拷贝到另外位置的一种说法。的优点是：1．
冷备份 指 冷备份发生在数据库已经正常关闭的情况下，香港虚拟主机，当正常关闭时会提供给我们一个完整的数据库。冷备份是将关键性文件拷贝到另外位置的一种说法。
的优点是：
1．是非常快速的备份方法（只需拷贝文件）
2．容易归档（简单拷贝即可）
3．容易恢复到某个时间点上（只需将文件再拷贝回去）
4．能与归档方法相结合，作数据库“最新状态”的恢复。
5．低度维护，高度安全。
但冷备份也有如下不足：
1．单独使用时，虚拟主机，只能提供到“某一时间点上”的恢复。
2．在实施备份的全过程中，数据库必须要作备份而不能作其它工作。也就是说，在冷备份过程中，数据库必须是关闭状态。
3．若磁盘空间有限，美国空间，只能拷贝到磁带等其它外部存储设备上，速度会很慢。
4．不能按表或按用户恢复。
今天 为mysql 做从服务器启动服务发现问题，因为主服务器数据量挺大 所以使用的是冷备份 直接cp到从服务器，在重启服务器mysql 报以下错误：
130307 9:21:44 InnoDB: Error: page 2328 log sequence number 73 1311259268
InnoDB: is in the future! Current system log sequence number 73 815920160.
InnoDB: Your database may be corrupt or you may have copied the InnoDB
InnoDB: tablespace but not the InnoDB log files. See
InnoDB:
InnoDB: for more information.
查找资料发现 在冷备份时 需要注意 数据表使用InnoDB存储引擎的需要备份 ib_logfile0 ib_logfile1 此文件用于存放InnoDB引擎的事务日志信息
直接把以上文件同时 拷贝到从服务器 启动服务正常
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