Backup RMAN Incremental Level 1 without Level 0 - 10gR2

Hi,
I'm a bit confused after some tests.
The Question: It's mandatory to perform backup incremental level 0 before the level 1 using Oracle 10gR2 ?
On Oracle 11.2 it's mandatory but on Oracle 10.2.0.5 I don't know.
Test on 11.2. If doesn't exists level 0 rman take care about it and perform automaticaly level 0 before level1
RMAN> backup incremental level 1 database;
Starting backup at 29-APR-11
using channel ORA_DISK_1
no parent backup or copy of datafile 1 found
channel ORA_DISK_1: starting incremental level 0 datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
...Docs said:
Incremental backups capture only those blocks that change between backups in each datafile.
In a typical incremental backup strategy, a level 0 incremental backup is used as a starting point. A level 0 backup captures all blocks in the datafile.
So, on Oracle 10.2.0.5 this not happen like on 11.2:
Perfoming backup level 1 without level 0:
RMAN> list backup;
RMAN> backup incremental level 1 database;
Starting backup at 29-APR-11
using channel ORA_DISK_1
channel ORA_DISK_1: starting incremental level 1 datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00001 name=+DG_ORCL/db10g/datafile/system.260.749756975
channel ORA_DISK_1: starting piece 1 at 29-APR-11
channel ORA_DISK_1: finished piece 1 at 29-APR-11
piece handle=+DG_FRA/db10g/backupset/2011_04_29/nnndn1_tag20110429t190340_0.260.749761421 tag=TAG20110429T190340 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:25
channel ORA_DISK_1: starting incremental level 1 datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
including current control file in backupset
including current SPFILE in backupset
channel ORA_DISK_1: starting piece 1 at 29-APR-11
channel ORA_DISK_1: finished piece 1 at 29-APR-11
piece handle=+DG_FRA/db10g/backupset/2011_04_29/ncsnn1_tag20110429t190340_0.262.749761449 tag=TAG20110429T190340 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:05
Finished backup at 29-APR-11
RMAN> backup archivelog all delete input;
Starting backup at 29-APR-11
current log archived
using channel ORA_DISK_1
Finished backup at 29-APR-11
RMAN> shutdown abort;
Oracle instance shut downDelete all files on ASM (except SPFILE).
ASMCMD> cd +DG_ORCL/DB10g
ASMCMD> ls
PARAMETERFILE/
spfiledb10g.oraSo, let's perfom restore of database
oracle@butao:/home/oracle> rman target /
Recovery Manager: Release 10.2.0.5.0 - Production on Fri Apr 29 19:06:52 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database (not started)
RMAN> startup nomount
Oracle instance started
Total System Global Area     293601280 bytes
Fixed Size                     2095872 bytes
Variable Size                 92275968 bytes
Database Buffers             192937984 bytes
Redo Buffers                   6291456 bytes
RMAN> restore controlfile from '+DG_FRA/db10g/backupset/2011_04_29/ncsnn1_tag20110429t190340_0.262.749761449';
Starting restore at 29-APR-11
using channel ORA_DISK_1
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:05
output filename=+DG_ORCL/db10g/controlfile/current.263.749761699
output filename=+DG_FRA/db10g/controlfile/current.263.749761699
Finished restore at 29-APR-11
RMAN> startup mount
database is already started
database mounted
released channel: ORA_DISK_1
RMAN> restore database;
Starting restore at 29-APR-11
Starting implicit crosscheck backup at 29-APR-11
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=156 devtype=DISK
Crosschecked 1 objects
Finished implicit crosscheck backup at 29-APR-11
Starting implicit crosscheck copy at 29-APR-11
using channel ORA_DISK_1
Finished implicit crosscheck copy at 29-APR-11
searching for all files in the recovery area
cataloging files...
cataloging done
List of Cataloged Files
=======================
File Name: +dg_fra/DB10G/BACKUPSET/2011_04_29/ncsnn1_TAG20110429T190340_0.262.749761449
File Name: +dg_fra/DB10G/BACKUPSET/2011_04_29/annnf0_TAG20110429T190442_0.264.749761485
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00001 to +DG_ORCL/db10g/datafile/system.260.749756975
restoring datafile 00002 to +DG_ORCL/db10g/datafile/undotbs1.261.749757085
restoring datafile 00003 to +DG_ORCL/db10g/datafile/sysaux.262.749757095
restoring datafile 00004 to +DG_ORCL/db10g/datafile/users.264.749757107
channel ORA_DISK_1: reading from backup piece +DG_FRA/db10g/backupset/2011_04_29/nnndn1_tag20110429t190340_0.260.749761421
channel ORA_DISK_1: restored backup piece 1
piece handle=+DG_FRA/db10g/backupset/2011_04_29/nnndn1_tag20110429t190340_0.260.749761421 tag=TAG20110429T190340
channel ORA_DISK_1: restore complete, elapsed time: 00:00:26
Finished restore at 29-APR-11
RMAN> recover database;
Starting recover at 29-APR-11
using channel ORA_DISK_1
starting media recovery
archive log thread 1 sequence 27 is already on disk as file +DG_FRA/db10g/onlinelog/group_3.259.749756971
archive log thread 1 sequence 28 is already on disk as file +DG_FRA/db10g/onlinelog/group_1.257.749756963
archive log filename=+DG_FRA/db10g/onlinelog/group_3.259.749756971 thread=1 sequence=27
archive log filename=+DG_FRA/db10g/onlinelog/group_1.257.749756963 thread=1 sequence=28
media recovery complete, elapsed time: 00:00:02
Finished recover at 29-APR-11
RMAN> alter database open resetlogs;
database opened
RMAN>See I don't need level 0 backup to restore level 1.
Thanks,
Levi Pereira

Hi Gokhan,
Thank you for point this.
After spending a time studying about this I find out this:
Your expanation apply only in Oracle 10gR1/R2.
Because there is differences between RMAN Version 10gR1/R2 and 11gR1/R2 about Incremental Level 1 and this confuse me.
Oracle 10gR1/R2 run only one backup incremental level 1 even if level 0 not exists .
Oracle 11gR1/R2 run two backups incremental if level 0 not exists. i.e level 0 first and after that level 1.
Oracle 10gR2
If no level 0 backup is available, then the behavior depends upon the compatibility mode setting. If compatibility is >=10.0.0, RMAN copies all blocks changed since the file was created, and stores the results as a level 1 backup. In other words, the SCN at the time the incremental backup is taken is the file creation SCN.
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/bkup004.htm
Thats means wich RMAN run level 0 with name level 1. (i.e: Only one Backup) This is confuse.
Oracle 11gR1
If no level 0 backup is available in either the current or parent incarnation, then the behavior varies with the compatibility mode setting. If compatibility is >=10.0.0, RMAN copies all blocks that have been changed since the file was created. Otherwise, RMAN behaves as it did in previous releases, by generating a level 0 backup.
http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/rcmcncpt.htm#BRADV89500
Oracle 11gR2
If no level 0 backup is available in either the current or parent incarnation, then the behavior varies with the compatibility mode setting. If compatibility is >=10.0.0, RMAN copies all blocks that have been changed since the file was created. Otherwise, RMAN generates a level 0 backup.
http://download.oracle.com/docs/cd/E11882_01/backup.112/e10642/rcmcncpt.htm#BRADV89500
Thats means wich RMAN run (automatically) level 0 first after finish level 0 backup RMAN run level 1 backup (i.e Two Backups). This seems right.
Regards,
Levi Pereira

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