RMAN incremental backup does not appear to create a level 0 if no previous level 0 exists (Doc ID 1372616.1)

Last updated on OCTOBER 27, 2016

Applies to:

Oracle Server - Enterprise Edition - Version: 11.2.0.2 and later   [Release: 11.2 and later ]
Information in this document applies to any platform.

Symptoms

When creating incremental backups, if no incremental level 0 exists the rman online documentation http://download.oracle.com/docs/cd/E11882_01/backup.112/e10643/rcmsynta007.htm#i78895 states:

"A level 0 backup must exist for each data file in the BACKUP command as the base backup for an incremental strategy.  Level 0 backups must not have status UNAVAILABLE.  If no level 0 backup exists, then RMAN makes a level 0 backup automatically."

Yet the backup log shows:

Starting backup at 01-nov-11 14:48:11
using channel ORA_DISK_1
using channel ORA_DISK_2
channel ORA_DISK_1: starting compressed incremental level 1 datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
...etc

This suggests that rman is creating an incremental backup rather than an automatic level 0 as the documentation specifies.

Cause

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