RMAN Vs Traditional Hot backup

Hi,
For traditional, we have to place the entire database/list of tablespace to backup mode. We get a lot of redo eventually archived logs.
For RMAN, does Oracle internally behaves the same way? Does it put the database in backup mode internally ?
Please put some light to it please.
Thanks
Cherrish Vaidiyan

Very short answer: no and no.
Short answer: http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/glossary.htm#sthref831.
Long answer: http://knol.google.com/k/oracle-begin-backup-end-backup#
Edited by: P. Forstmann on 12 avr. 2010 21:34

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Difference betwen RMAN,COLD and HOT backup

Hi Experts,
I have faces some interview question .
what is difference between COLD and HOT backup ?
what is difference between RMAN, COLD and HOT backup?

You mean the following,
Mark the beginning of the online tablespace backup.
SQL> ALTER TABLESPACE users BEGIN BACKUP;
Back up the online datafiles of the online tablespace with operating system commands. For UNIX:
% cp /oracle/oradata/trgt/users01.dbf /d2/users01_'date "+%m_%d_%y"'.dbf
After backing up the datafiles of the online tablespace, run the SQL statement ALTER TABLESPACE with the END BACKUP option.
SQL> ALTER TABLESPACE users END BACKUP;
Please visit here for more details:
Making User-Managed Backups of Online Read/Write Tablespaces
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/osbackup004.htm#sthref1489
Adith

RMAN script for hot backup (looking for code critic) code attached.

Hello Guru's,
I have been having soem trouble running a successful hot full rman backup nightly.
We max our CPU load whenever our RMAN takes too long and conflicts with a Legato tape backup. I have a development server that I attempted to get a consistent backup time duration that is rock solid as to not conflict with the Legato backup time.
I just found out about duration with RMAN scripts here is my code:
#!/bin/bash
#rman backup script for daily hot whole database backup
at -f /hd1/rman_scripts/rman_backup 0600 tomorrow
rman target/
run {
allocate channel d1 device type disk format '/path/%U';
backup duration 1:00 partial minimize load database filesperset 1;
backup as BACKUPSET tag '%TAG' database;
backup as BACKUPSET tag '%TAG' archivelog all delete all input;
delete noprompt obsolete;
release channel d1;
exit
It completes the backup, but does not use the 1 hour allocated- it only uses 15 minutes on average and creates many files instead of normally three backup files.
Here is the results from querying the v$rman_status table for operation,status,start_time:
RMAN,FAILED, 17-OCT-06 0600
BACKUP,FAILED,17-OCT-06 0600
RMAN,FAILED,17-OCT-06 0606
BACKUP,COMPLETED,17-OCT-06 0606
BACKUP,COMPLETED,17-OCT-06 0606
BACKUP,FAILED,17-OCT-06 0615
RMAN,COMPLETED,17-OCT-06 1513
REPORT,COMPLETED,17-OCT-06 1513
DELETE,COMPLETED,17-OCT-06 1513
However, the timestamps of the backupset files it creates is:
06:15 and not 1513?????????????
RMAN appears to have only taken 15 minutes to create the files, why do I have a completed timestamp from v$rman_status of 1513???
Please advise and comment, I am just learning RMAN.

Try to remove the DURATION option in your script.
Here more details about that part.
http://download-east.oracle.com/docs/cd/B19306_01/backup.102/b14194/rcmsynta009.htm#i1010261
Bye, Aron

RMAN script for RAC Hot Backup

Anyone who want to share an RMAN script to Hot Backup a 9i RAC Database.

Try to remove the DURATION option in your script.
Here more details about that part.
http://download-east.oracle.com/docs/cd/B19306_01/backup.102/b14194/rcmsynta009.htm#i1010261
Bye, Aron

Steps to create the standby with Hot Backup........?????

Hi All
I am planning to create the Physical standby with Hot backup ....
Can anyboby give me the link/steps which explains how to do this?
Thanks
Gagan

To copy the file from the primary, you can use RMAN, or manual hot backup copy with begin backup and end backup mode.
You can read the doc about creation of standby database :
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14239/create_ps.htm#i70835
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14239/scenarios.htm#i1032302
Nicolas.

RMAN & Hot backup cloning taking long time

Dear DBAs,
We are doing both RMAN & Hot backup cloning foe that taking more time to restore data files to TEST instance. scp taking too much time to copy to target server because of its volume of data (1.5 TB) & Mounting the RMAN backups drive on test server and restoring from that drive taking more than 8 hours.
I heard that some companies are using some device to move heavy volume Hot backup copy from source to dest faster for clone the instance easily with in minutes. What is that device name to take hot backup copies from source and restore it in target server.
Test server Specs
Processor 8 cores with 32GB Memory.
Thanks
DBA

Hot backup is not recommanded for the database size more than 1T.
RMAN backup and restore is the only opiton available for a DBA.
Other option is to use EMC Symmentrix/BCV's/Snapshots. EMC uses pair of disks to achive synch the produciton data with test server. read more about EMC symmentrix or ask your storage team.

RMAN Hot Backup Errors.

Hello Everyone
I would appreciate if someone can assist me in resolving a problem. Starting from December of last year, we were able to take daily hot backups of our ORACLE 10g database server successfully with no issues. Presently we have been experiencing a number of errors in the logs, even though the script has not been changed. The main errors are as follows:
RMAN-03009: failure of backup command on t1 channel at 05/08/2007 00:01:19
ORA-19602: cannot backup or copy active file in NOARCHIVELOG mode
In investigating the errors, it seemed to be associated to the tablespace not being put offline or backup mode cleanly, I assumed this was due to persons working later, so I scheduled the backup for a later time but I still got the same error in the log the following day. Can you assist me in resolving this problem please?

Is the db running in ARCH mode?
Error:     ORA 19602
Text:     cannot backup or copy active file in NOARCHIVELOG mode
Cause:     You tried to copy or backup a file that was not closed cleanly, and
     the database was in NOARCHIVELOG mode. This is not allowed because when
     restored, the file will require redo application before it is usable,
     and redo is not currently being saved beyond the contents of the online
     redo logs.
Action:     Take the tablespace offline clean or close the database and retry the
     copy or backup. Take the tablespace offline clean or close the database
     and retry

Rman hot backup

hello
i am using rman hot backup script to take backup database everyday but the problem is it is working but not deleting old backup older than 2 days .
also i have question .. my database is in archive log mode and everyday about 6-7 .arch files generating in my archive directory.
it is not deleting the old files but generating new files everyday so adding up to the space.
SQL> show parameter archive
NAME TYPE VALUE
archive_lag_target integer 0
log_archive_config string
log_archive_dest string /u03/archive_logs/DEVL
log_archive_dest_1 string
also should i set dest_1 as archive location or just log_archive_dest
whats is the difference.?
my rman script is
RMAN Hot backup.unix script
The RMAN hot backup script rman_backup.sh:
# !/bin/bash
# Declare your environment variables
export ORACLE_SID=DEVL
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=/u01/app/oracle/product/11.2.0/db_1
export PATH=$PATH:${ORACLE_HOME}/bin
# Start the rman commands
rman target=/ << EOF
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/u03/backup/autobackup_control_file%F';
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 2 DAYS;
run {
allocate channel d1 type disk;
allocate channel d2 type disk;
allocate channel d3 type disk;
allocate channel d4 type disk;
ALLOCATE CHANNEL RMAN_BACK_CH01 TYPE DISK;
CROSSCHECK BACKUP;
BACKUP AS COMPRESSED BACKUPSET DATABASE FORMAT '/u03/backup/databasefiles_%d_%u_%s_%T';
sql 'ALTER SYSTEM ARCHIVE LOG CURRENT';
BACKUP AS COMPRESSED BACKUPSET ARCHIVELOG ALL FORMAT '/u03/backup/archivelogs_%d_%u_%s_%T' DELETE INPUT;
BACKUP AS COMPRESSED BACKUPSET CURRENT CONTROLFILE FORMAT '/u03/backup/controlfile_%d_%u_%s_%T';
CROSSCHECK BACKUP;
DELETE NOPROMPT OBSOLETE;
DELETE NOPROMPT EXPIRED BACKUP;
RELEASE CHANNEL RMAN_BACK_CH01;
EXIT;
EOF
thanks

Ahmer Mansoor wrote:
RMAN never deletes the Backups unless there is a space pressure in the Recovery Area. Instead it marks the Backups as OBSOLETE based on Retention Policy (in your case it is 2 Days),
To confirm it SET DB_RECOVERY_FILE_DEST_SIZE to some smaller value, the RMAN will remove all the Obsolete Backups automatically to reclaim space.Be very careful with this. If you generate a LOT of archivelog files and you exceed this size, on the next archivelog switch your database will hang with "cannot continue until archiver freed". RMAN will not automatically remove anything. RMAN only removes stuff when you program it in your script.
See:
http://docs.oracle.com/cd/E14072_01/backup.112/e10642/rcmconfb.htm#insertedID4 Retention Policy (recovery window or redundancy)
things like:
set retention window and number of copies
crosscheck backup
delete obsolete <-- delete old, redundant, no longer necessary backups/archivelogs
delete expired <-- NOTE: If you manually delete files and do not execute delete expired (missing file), the DB_RECOVERY_FILE_DEST_SIZE remains the same. So, you can clean out the space and oracle will still say the location is "full".
Understand that if you also set this parameter too small and your backup recovery window/redundancy are incorrectly set, you can also exhaust the "logical" space of this location again, putting your database at risk. Your parameter could be set to 100G on a 400G file system and even though you have 300G available, Oracle will see the limit of this parameter.
My suggestion, get in a DEV/TEST environment and test to see how to best configure your environment for RMAN database backups/control file, archivelog backups also taking into consideration OS tape backup solutions. I always configure DISK for RMAN backups, then have some other tape backup utility sweep those locations to tape ensuring that I have sufficient backups to reconstitute my database - I also include a copy of the init.ora file, password file as well as the spfile backup in this location.
>
In case of Archivelogs, It is better to create and execute a Purge Job to remove Archivelogs after backup them on tape.I almost agree. I try to keep all archivelogs necessary for recovery from last full backup online. I try to keep a full backup online as well. much faster at restoring stuff instead of trying to locate it on tape.

RMAN hot backup cloning problem..need a way out

I took hot backup from server A using RMAN
I prepared server A by running preclone on apps and db tier
I copied apps tier and dbTier(tech_st) from server A to server B..Apps and db tier were up and running during the copy.I also copied the RMAN backup sets
now on server B, what should i do..RMAN backup is in backup sets and i need to restore it on server B(Target server)
I am following note 406982.1 for cloning steps..
in advanced clonign options, it doesnt specify to run adcfgclone on apps tier too
please guide
help appreciated

Hi,
The document assumes that you are aware of the RMAN backup, and you know how to duplicate the database.
Oracle Database Documentation
http://www.oracle.com/technology/documentation/database.html
Search this forum for "RMAN Duplicate" there are many documents referenced as this topic was discussed many times before.
Regards,
Hussein

Restoring a Hot backup using RMAN on a different server.

Hi
we are using oracle 10.2.0.4.0 on solaris 10 and using a separate catalog for RMAN backups.
we have taken a production db Hot backup as follows
level 0 backup on 28 th dec.
level 1 on 29,
level 1 on 30 and
level 1 on 31 st.
now today in the month of feb .
we would like to create a dev. DB on a diffent server which has diffent directory structure, i have to create a db using the above backups to setup the db like on 31 st Jan.
could you please provide the steps and advice how do i proceed.
Thansk fot the help.

Make level 0 and level 1 backups + control files backups + archived redo logs backup available on new host and use RMAN DUPLICATE.
See examples in http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmdupdb.htm#i1008564
Edited by: P. Forstmann on 2 févr. 2010 22:39
Edited by: P. Forstmann on 3 févr. 2010 07:57

Missing logfiles when hot backup is taken using RMAN

Hello All,
I am having the below situation .Please help to clarify.
I have taken hot backup using RMAN. Database is in Archivelog mode. It doesn't take backup of online redo logs. The status of my redo logs are as below. All are not archived.
/u01/app/oracle/oradata/redo01.log ----Active---Not Archived
/u01/app/oracle/oradata/redo03.log ----Active---Not Archived
/u01/app/oracle/oradata/redo03.log----Current---Not Archived
Now, I am using the backup to restore a database on another machine. But as the logs are not archived, I may miss some data.
How can I get the data also?
Regards
VJ..

I have taken hot backup using RMAN. Database is in Archivelog mode. It doesn't take backup of online redo logs. The status of my redo logs are as below. All are not archived.
/u01/app/oracle/oradata/redo01.log ----Active---Not Archived
/u01/app/oracle/oradata/redo03.log ----Active---Not Archived
/u01/app/oracle/oradata/redo03.log----Current---Not Archived
Now, I am using the backup to restore a database on another machine. But as the logs are not archived, I may miss some data.
How can I get the data also?If the redo log status is still "ACTIVE" that mean, still archiving is in progress,
You can give even
SQL> alter system checkpoint;and do you have any idea at what point you want to recover your database? Even though they are in ACTIVE stauts, when you are taking backup. Still you can apply them how much you want. There will be no lost data. But ensure you haven't opened[resetologs] database.

Hot backup : Rman vs. ALTER TABLESPACE...BEGIN BACKUP

Dear Experts,
I'm currently using the following statements
- ALTER TABLESPACE (...) BEGIN BACKUP
- host ocopy (...)
- ALTER TABLESPACE (...)END BACKUP state
I'm going for rman now but I've got 2 questions for those who did that in the past:
1/ Will rman reduce the size of my hotbackup ?
2/ Does the hot backup run faster using rman ?
Thanks.
Best Regards,
Jerome

1/ Will rman reduce the size of my hotbackup ? rman backup only those blocks which get accessed by oracle, means it doesn't copy the empty blocks as a part of backup as your OS copy command does. So yeah, the size of the backup will be smaller if there are huge datafiles but with comparably less data. Moreover if you are on 10g then you can use compressed backupset feature which will compress the backupsets.
2/ Does the hot backup run faster using rman ?
By using rman, there is no need to put every tablespace in backup mode, you can run the backup in parallel by allocating multiple channels, on 10g you can use block change tracking feature to speed up your incremental backups AND as explained in point 1 there is no need to copy the whole datafile. These all are the benefits of RMAN and I can't make a state statement that by all this the backup will run faster but will definitely go for it.
Daljit Singh

Automating refreshing one system with the rman hot backup copy from another

Hi Apps DBAs,
Right now we have two systems: production (OPEBSN) and production support (FINSUP).
I implemented a cronjob, which can refresh FINSUP every night from the cold backup of production. We shutdown the production system at night.
But our istore on production will go live soon and our production system will run 24*7.
The production is already hot backed up from RMAN.
Is it possible to do the following?
Automating refreshing FINSUP from the RMAN hot backup of OPEBSN?
If it is possible, would you please outline the general idea or give me a reference documentation?
If it is not possible, is there any other way to realize our purpose?
Thank you in advance!
Lily

There is some discussion about this topic in the belwo askTom thread.
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:21934468026100
Sam
http://appstech-sam.blogspot.com

User hot and Rman hot backup

During user mode hot backup lots of redo gets generated as the entire block is written when any changes are made to a block which is in hot backup mode.But during Rman hot backup less redo are generated why is this so and whatz the logic invloved? and how oracle recovers the file that has been backed up through Rman.
Could you please explain me regarding this in detail it will be really helpful.
kumaresh

From Article Note:76736.1 RMAN FAQ: Recovery Manager -- Frequently Asked
To understand why RMAN does not require extra logging or backup mode,
you must first understand why those features are required for non-RMAN
online backups.
A non-RMAN online backup consists of a non-Oracle tool, such as cp or
dd, backing up a datafile at the same time that DBWR is updating the
file. We can't prevent the tool from reading a particular block at the
exact same time that DBWR is updating that block. When that happens,
the non-Oracle tool might read a block in a half-updated state, so that
the block which is copied to the backup media might only have been
updated in its first half, while the second half contains older data.
This is called a "fractured block". If this backup needs to be restored
later, and that block needs to be recovered, recovery will fail because
that block is not usable.
The 'alter tablespace begin backup' command is our solution for the
fractured block problem. When a tablespace is in backup mode, and a
change is made to a data block, instead of logging just the changed
bytes to the redo log, we also log a copy of the entire block image
before the change, so that we can reconstruct this block if media
recovery finds that this block was fractured. That block image logging
is what causes extra redo to be generated while files are in backup
mode.
The reason that RMAN does not require extra logging is that it
guarantees that it will never back up a fractured block. We can make
that guarantee because we know the format of Oracle data blocks, and we
verify that each block that we read is complete before we copy it to the
backup. If we read a fractured block, we read the block again to obtain
a complete block before backing it up. non-Oracle tools are not able to
do the same thing because they do not know how to verify the contents of
an Oracle data block.
Backup mode has another effect, which is to 'freeze' the checkpoint in
the header of the file until the file is removed from backup mode.
We do this because we cannot guarantee that the third-party backup
tool will copy the file header prior to copying the data blocks.
RMAN does not need to freeze the file header checkpoint because we
know the order in which we will read the blocks, which enables us to
capture a known good checkpoint for the file.

Step by Step RMAN configuration for full hot backup daily

Dear experts,
i am new to oracle RMAN , i have gone through couple of RMAN guides for configuration ,
i have oracle e-business suite (R12.1.1) and database is ( 11.1.0.7) on red hat enterprise linux 5.3 . All of this is 64 bit.
i have a database about 175 gb which is as usual growing day by day as data entry is taking place.
Untill now we have a cold backup strategy in the midnight 3 am a script down the database and make abc.tar.gz file of 25 gb approx. . This process takes about 100 minutes. But now due to new sales system we want our database up 24/7 .
So we want to configure RMAN hot backup.
I want to take backup on disk.
daily full hot backup.
backupsets
currently database is in no-archivelog
plz help me to proceed with this .
Edited by: user13376823 on Feb 10, 2011 12:17 PM

user13376823 wrote:
Dear all,
i am using this script for my full hot backup ,
run
allocate channel c1 device type disk format '/opt/R12Backups/rman/%U';
allocate channel c2 device type disk format '/opt/R12Backups/rman/%U';
crosscheck backup;
BACKUP DATABASE FORMAT '/opt/R12Backups/rman/proddb_%u_%p_%c';
sql 'alter system switch logfile';
BACKUP ARCHIVELOG ALL DELETE INPUT FORMAT '/opt/R12Backups/rman/archlog%U';
DELETE NOPROMPT OBSOLETE REDUNDANCY =1 device type disk;
DELETE NOPROMPT EXPIRED BACKUPSET OF DATABASE device type disk ;
BACKUP AS COPY CURRENT CONTROLFILE FORMAT '/opt/R12Backups/rman/copy_of_cf_%U';
BACKUP SPFILE FORMAT '/opt/R12Backups/rman/spfile_%U';
release channel c1;
release channel c2;
1.please tell me that it is covering all aspects of a backup . Can i do complete recovery with this backup in case of disaster?
Define "all aspects".
2. i only get database and controlfile backup at my location. There is no backup of archivelogs , What happened with
that ?Without seeing the output that rman generated from running the above block, and without seeing all of the persistent rman settings, it is impossible to diagnose anything. I will say that your script looks overly complex.
Just to give you a point of comparison, here's my setup. First the persistent rman settings. Take note of anything that is NOT marked as "default";
RMAN> show all;
using target database control file instead of recovery catalog
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 1;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE 'SBT_TAPE' TO 3;
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/ora00/app/oracle/product/10.2.0/db_1/dbs/snapcf_vlnxora1.f'; # defaultAnd here is my basic "full backup" script
[oracle@vmlnx01 bin]$ cat rman_full.scr
connect target /
show all;
run {
backup incremental level 0 database tag='bkup_vlnxora1_full';
backup archivelog all not backed up 2 times tag='bkup_vlnxora1_arch';
delete noprompt archivelog all backed up 2 times to device type disk;
list backup summary;
report obsolete;
quit

RMAN Vs Traditional Hot backup

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