备份集

• A collection of information that is required to access a specific database
  每个备份集都分布在所属媒体集的所有媒体簇中。
• Backup set will expire
  备份集过期时间
• In tape backup files , data block is the unit of physical i o
  备份集( backup set )从备份所属的媒体集方面进行说明的单个备份。
• A different backup set password can be used for each backup set on the media
  可以对媒体上的每个备份集使用不同的备份集密码。
• Specifies that all backup sets should be overwritten , but preserves the media header
  指定应覆盖所有备份集，但是保留媒体标头。
• A backup set password does not protect the backup file from being overwritten , however
  但是，备份集密码不能防止覆盖备份文件。
• The full database backup to be restored is the sixth backup set on the device
  另外，以下示例还说明如何还原媒体上的另一个备份集。
• Backup set password
  备份集密码
• When a restore is performed , if the backup set was not already recorded in the
  数据库中没有记录备份集，则可能修改备份历史记录表。
• In addition , the user may specify passwords for a media set , a backup set , or both
  此外，用户可以为媒体集、备份集或两者指定密码。