官方解释:
A level 1 incremental backup can be either of the following types:
A differential backup, which backs up all blocks changed after the most recent incremental backup at level 1 or 0
A cumulative backup, which backs up all blocks changed after the most recent incremental backup at level 0
Incremental backups are differential by default.
在differential(差异)模式下(缺省)
0=全备
1=上次全备或LV1至今的增量(无论是否有,有N次 LV2的备份,一律从上次lv1或0至今的变化) 0/1 ~ NOW
2=上次任意级别备份至今的增量(任意一次备份至今) 0/1/2 ~ NOW
![Rman incremental level 1和2的区别 _rman](http://img.ph.126.net/t-3SMbp5fnTLy6M9M6Xbvw==/2394789101871042381.jpg)
在cumulative(累积的)模式下,
0=全备
1=上次全备至今的增量(无论是否有,有N次LV1的备份,一律从全备至今的变化) 0 ~ NOW
2=上次0或1级别备份至今的增量(2次LV2间的累积,也汇总备份至今)0/1 ~ NOW (differential下的LV1)
![Rman incremental level 1和2的区别 _rman_02](http://img.ph.126.net/vBa0Iypf8Govwtk7BJOB3w==/3369255471227912081.jpg)