What is the need for level 0 and level 1 backup?

I am a bit confused about the need for level 0 and level 1 backup. Oracle has proposed strategy in 10g creates only level 1 backup continues to not to break and not to create any level of 0 after the first backup of level 0. But I had seen in the document Oracle Database Backup & Recovery basis he suggests to create backup of level 0 on weekly or monthly basis. There?

Secondly according to my understanding when creating oracle backup of level 1 first creates a level 0 backup that contain also copies of data image files and then apply an incremental copies of the image, once the incremental backup is applied on the copy of the image you don't have to the previous incremental backups. Am I wrong?
If I'm right, what is the difference between level 0 & backup of level 1? and after the level 0 backup you must also all previous backups.

PL. help me to clarify my questions in this regard.

Kind regards

Vassallo

What is the most reliable in terms of recovery?

I do not see the differences in terms of recovery, the two strategies are reliable.

There is an advantage in terms of recovery time expected, Oracle says:

/*
Incorporate gradually update the backup in your backup strategy shortens the time of recovery as provided. The reason is that media recovery right now or at some point in the recent past may begin at the time of the last backup of level 1 applied, rather than at the time of the last full database backup.
*/

In a regular incremental backup strategy you always go back to a level 0 backup and then to apply everything follows level 1 backups + archivelogs. But - for an incremental backup set to day - it's a little tricky to emerging a window of recovery, normally relies on redundancy 1, i.e. that a backup is retained, you cannot go back, this type of backup is designed for a quick and complete recovery.

But there is a solution (I don't think there is place in EM), even if you're on 10g, see the 11 g documentation, he explains fuller:

http://download.Oracle.com/docs/CD/B28359_01/backup.111/b28270/rcmbckba.htm#BRADV89532

Werner

Tags: Database

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