Can we take Incremental backups without Level 0 backups
Kindly share the procedure if any by which we can initiate an incremental backup without Level 0 backup
Kindly share the procedure if any by which we can initiate an incremental backup without Level 0 backup
There is NO such procedure.
You can't 'increment' something that doesn't exist can you?
Please increment the previous number by 1. Can you do that? Of course not because there IS no previous number.
BY DEFINITION (see the doc) an incremental backup for any level but 0 REQUIRES a previous backup:
an incremental backup copies only those data blocks that have changed since a previous backup
A level 1 incremental backup can be either of the following types:
A differential incremental backup, which backs up all blocks changed after the most recent incremental backup at level 1 or 0
A cumulative incremental backup, which backs up all blocks changed after the most recent incremental backup at level 0
Incremental backups are differential by default.
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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 PereiraHi 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 -
If I take incremental level 0 backup on Monday, full database image copy backup on Tuesday, incremental level 1 on Wednesday and Incremental level 2 backup on Thursday;
Can i do complete recovery on Friday by applying incremental level 1 & 2 backup on the image copy backup???Atiq wrote:
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D ROY
SHILLONG- INDIAcontent of the log file:
Connected to: Oracle8i Enterprise Edition Release 8.1.7.4.0 - Production
With the Partitioning option
JServer Release 8.1.7.4.0 - Production
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Any ideas or solutions?
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Is it possible to take a full backup without shutting down an instance?
The db version is 10gr2.
As far as I know, in order to take a full backup of a database,
one need to shutdown a database.
Our db environment is a RAC environment which has two nodes.
Yesterday, I heard from a hardware vendor that we do not need to shutdown
instances(2-nodes) in order to take a full backup.
Best Regards.Hi,
>>As far as I know, in order to take a full backup of a database, one need to shutdown a database.
In fact, a database operating in NOARCHIVELOG mode is necessary to shutdown the database in order to perform a full backup (Cold Backup), but otherwise a database that is operating in ARCHIVELOG mode, then is possible to perform a full database backup with the database in a open state. (Hot Backup)
For more information see if these links below can help you:
Oracle Backup and Recovery
http://www.oracle.com/technology/deploy/availability/htdocs/BR_Overview.htm
Oracle Backup and Recovery FAQ
http://orafaq.com/faqdbabr.htm
Cheers -
Incremental Backups Without Overwritting
Hello....does anyone know of a way to create incremental backups without having to overwrite the previous? Is there a flag to set?
I would like to keep 2 days worth of incrementals "online".Hello Paul,
>does anyone know of a way to create incremental backups without having to overwrite the previous? Is there a flag to set?
>I would like to keep 2 days worth of incrementals "online".
For further information about MaxDB backup you can check note [1377148|http://service.sap.com/sap/support/notes/1377148].
Regards,
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bzb888 wrote:
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