Oracle RMAN中全备份与0级备份区别

最新推荐文章于 2024-02-22 18:10:08 发布

转载最新推荐文章于 2024-02-22 18:10:08 发布 · 371 阅读

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本文详细介绍了RMAN（Recovery Manager）中的FULL和INCREMENTAL两种备份类型。FULL备份包括所有数据文件块，而INCREMENTAL备份则只包含自上次指定级别增量备份以来更改的数据块。文章还解释了不同级别的INCREMENTAL备份之间的差异及其在备份策略中的作用。

官方文档B14194-03 Backup and Recovery Reference描述

FULL
Creates a backup of all blocks of datafiles included in the backup. FULL is the opposite of

INCREMENTAL.
RMAN makes full backups by default if neither FULL nor INCREMENTAL is specified.
A full backup has no effect on subsequent incremental backups, and is not considered a part of any

incremental backup strategy (though a full image copy backup can be incrementally updated by applying

incremental backups with the RECOVER command).

INCREMENTAL LEVEL [=]integer
Copies only those data blocks that have changed since the last incremental integer backup, where

integer is 0 or 1. An incremental backup at level 0 backs up all data blocks in datafiles being backed

up. An incremental backup at level 1 backs up only changed blocks. An incremental backup can be either differential or

cumulative.In a cumulative level 1 incremental backup, RMAN backs up all blocks changed since the most

recent level 0 backup. In a differential level 1 incremental backup, RMAN backs up blocks updated since the last level 0 or level 1 incremental backup. Incremental backups at level 0 can be either backup sets or image copies.

Incremental backups at level 1 can only be backup sets. A level 0 backup must exist as the base

backup for an incremental strategy.

An incremental backup at level 0 is identical in content to a full backup, but
unlike a full backup the level 0 backup is considered a part of the incremental
strategy. If no level 0 backup exists when you run a level 1 backup, then
RMAN makes a level 0 backup automatically.

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