ORACLE全备份和0级增量备份的区别
ORACLE全备份和0级增量备份的区别比较官方的说法FullA 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.IncrementalAn 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.网上搜到的只言片语The only difference between a level 0 backup and a full backup is that a full backup is never included in an incremental strategy. If no level 0 backup exists when you run a level 1 or higher backup, RMAN makes a level 0 backup automatically to serve as the base.增量备份0级与全备份都是全备份,但是增量备份0级使用rman备份的话就只备份了used block,而全备份备份了used and unused block总结一下,二者有两个地方不同1全备份不能被用作1级增量备份的基础2使用rman备份的时候,全备份备份了used and unused block,0级使用rman备份的话就只备份了used block
