一．　　1、备份数据库market。

2、还原数据库market。

3、假设market数据库在Mybak本地磁盘设备上作了5次备份，包括一次全库备份，两次差异备份和两次日志备份，现在存储介质发生故障，需要从备份中恢复。

-one. A backup database market. 2, reduction database market. 3, assuming that the database market Mybak local disk devices made five backup, including a full backup for two different backup and two log backup, storage media failure the need to recover from the backup.