Oracle备份类型level0、level1，增量、差异备份 -转

备份类型：
完全备份包含所有使用的数据文件块。
0 级增量备份等同于标记为 0 级的 完全备份。 累积 1 级增量备份只包含自上次 0 级增量备份以来修改过的块。
差异 1 级增量备份只包含自上次增量备份以来修改过的块。
 要应用level1级备份，必须要有相应的level0级备份；
backup incremental level 0 database;
  --level0级备份
backup incremental level 1 database;
  --level1级备份 (默认为差异备份)
backup incremental level 1 cumulative database;
  --level1级 累积增量备份
快速增量备份 ：
    通过块更改跟踪实现，它可以： 维护自上次备份以来发生更改的块的记录 生成重做时，将此记录写入文件 执行备份时自动存取，从而可以更快地执行备份

 

 

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比较官方的说法
Full
A backup of a datafile that includes every allocated block in the file being backed up. A full backup of a datafile can be an image copy, in which case every data block is backed up. It can also be stored in a backup set, in which case datafile blocks not in use may be skipped, according to rules in Oracle Database Backup and Recovery Reference.

A full backup cannot be part of an incremental backup strategy; that is, it cannot be the parent for a subsequent incremental backup.

Incremental
An incremental backup is either a level 0 backup, which includes every block in the file except blocks compressed out because they have never been used, or a level 1 backup, which includes only those blocks that have been changed since the parent backup was taken.

A level 0 incremental backup is physically identical to a full backup. The only difference is that the level 0 backup is recorded as an incremental backup in the RMAN repository, so it can be used as the parent for a level 1 backup.