RMAN Backup Speed

Hi All,
Our Database size is 1.3 TB and we take RMAN backup but it takes around 48 Hours to do backup in oracle 9i and in oracle 10g offers block compression can this help to reduce the backup time.
Regards
Balu

Please have a look to links mentionned in this thread:
Re: RMAN BACKUP PERFORMANCE.

Similar Messages

How to speed up rman backup?

Hi,
we are taking backup using rman. my database size is increasing.so rman backup time is increasing. so i want to spped up rman bakup performance. how to speed up rman bakup?
Thnaks,

My general request whenever you post the question in forum please start your question something like this:
Oracle Version : <4 digit version> select * from v$version;
OS Information with complete version and/or patch whatsoever.
1. http://www.oracle-base.com/articles/10g/RMANEnhancements10g.php
2. Re: RMAN Backup Script
and read the reply of Adith
You can also use set
CONFIGURE BACKUP OPTIMIZATION ON
Additionally review
Restarting and Optimizing RMAN Backups
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmbackp007.htm#i1006318
Best Regards
Girish Sharma

Speeding up RMAN backup job

Hi,
Is there anyway to increase the speed of the RMAN backup job where the job is already started running?
Regards,
007

007 wrote:
Hi CKPT,
I am using Oracle Database 11g(11.2.0.1).
Regards,
0071) If your backup is not streaming to tape, then make sure that the RATE parameter is not set on the
ALLOCATE CHANNEL or CONFIGURE CHANNEL commands.
2) Check init.ora/spfile parameters and confirm if async IO is configured:
DISK_ASYNCH_IO=TRUE (or defaulted): native async io is assumed to be in use
DISK_ASYNCH_IO=FALSE and DBWR_IO_SLAVES > 1: async io is simulated with disk IO slaves
BACKUP_TAPE_IO_SLAVES=TRUE: tape IO slave is used
DB_WRITER_PROCESSES - if >1 this is NOT compatible with DBWR_IO_SLAVES > 1
3) If You Fail to Allocate Shared Memory, Set LARGE_POOL_SIZE
LARGE_POOL_SIZE = number_of_allocated_channels *
(16 MB + ( 4 * size_of_tape_buffer ) )
4) Allocate 4 channels if backing up to disks, increase it further if required.
5) Use rman backup operation during off business hours, to give more resource to rman jobs.

Rman backup - how to preserve the file names exactly when backing up?

Hi,
I have been using RMAN for backup and I want to change things so that it is
easier to go back to the old tried-and-true method of recovery by recreating
a control file manually via the trace file, which lists the files out individually.
The first change - to change from compression to copy.. is fine.
But even then, rman names the files some weird name.
I am not trying this- using the disk format command is supposed to work..
rman nocatalog << EOF
connect target;
allocate channel for maintenance type disk parallelism 1 \
format '/agile/ora_flash_recovery_area/PECHA/backupset/backup/%U';
backup as copy database;
release channel;
but it still is using wierd (auto-generated) names for the data files as it backs up.
Has anyone else got this working? Thanks Marvin.

Ok here is why I would like exact filenames..
1) to speed the time of recovery. I am much more familiar with traditional recovery methods than RMAN, and while I myself installed and suggested RMAN for backups, our other (11i) database does not use RMAN and so I am more familiar with traditional recovery. So to be able to recover quickly I want to have these files as close as possible to the original names so that I can use my standard script (from a trace file) to recreate the control fiile. If I can get RMAN to spit out the filies with original names but keep RMAN for making the backup, I may ditch the rman bacjup script in chron and write a traditional hot backup script which copies the files the old fashioned way.
2) to reduce cloning time. The RMAN duplicate command is not as good as I thought. I was actually easier for me to restore RMAN backups first to a box that has all the same paths, and THEN shutdown (cold) these files and copy them cold to another server, and restore from there. Agaiin if I can get the original file names, I could choose to do recovery either way (RMAN or traditional) in a real emergency instead of being forced to use rman.
3) to be able to switch to a backup file in the FRA without having to rename it. Seems logical if it is already named correctly.
thanks ! Marvi

RMAN backup taking long time

Hi
Oracle 10.1.0.2.0
OS IBM/AIX RISC/6000
I have a db of around 150GB,Normally i take cold backup (using OS commands) it takes around 4 hours. Today i just wanted to use rman to take online backup on disk it took around 8 hours to complete. i used the following.
run {
allocate channel d1 type disk;
allocate channel d2 type disk;
backup database plus archivelog;Do i need to configure more channels?? what else can i do to decrease the time taken by backup.
Thanks

Hi,
To increase the backup speed in RMAN , **Allocate multiple channels and assign files to specific channels.aA
**Allocate Disk buffers like FILESPERSET = number , MAXOPENFILES = number
** Set the backup duration
Eg: BACKUP DURATION 5:00 DATABASE;
BACKUP DURATION 1:00 PARTIAL TABLESPACE <tablespace_name>;
BACKUP DURATION 2:00 PARTIAL MINIMIZE TIME DATABASE;
BACKUP DURATION 2:00 PARTIAL MINIMIZE LOAD DATABASE;
Good luck..
Edited by: sshafiulla on Jan 24, 2010 11:23 AM

RMAN backup slow

Hi,
I have a Production Database (10204) running on HP Unix (B.11.11).
Daily morning 6AM, a full RMAN backup runs. The db size is only around 225GB. But it takes 4.5 hours to complete.
The syntax which I use is given below.
RMAN> run {
     allocate channel ch1 type "sbt_tape";
     allocate channel ch2 type "sbt_tape";
     allocate channel ch3 type "sbt_tape";
send
'NB_ORA_CLIENT=jjcprd04-back.backup.ncsus.jnj.com,NB_ORA_POLICY=JJCPRD04-RMAN';
     backup
     format 'bk_%s_%p_%t'
     (database include current controlfile);
     sql 'alter system archive log current';
     backup
     format 'arch_%d_%s_%p_%t'
     (archivelog all delete input );
Is there a way to increase the speed of this backup? Currently the backup is way too slow as it takes 4.5 hours to copy 225GB of data!
Thanks!

I'll start by stating that backups directly to tape are generally quite slow.
I'd still recommend moving to disk backups though... and just archiving it to a tape...Hi Jony,
You can of course backup to disk. Thats a common solution. But you have to deal with space more than everything. In addition to that backing up to disk does not free you from moving/copying your data - depending on your backup strategy - to a long-term storage.
So you have two different and not conjunct backup operations: the rman backup itself and the job which backups the rman area to another media.
In recovery cases you might end up with RMAN requesting older backupsets which are not on disk anymore. This will most probably lead to recovery failures and manual intervention which is not desirable in recovery scenarios.
Another point is the control of the data flow. Backing up via a MML (i.e. "to tape") does not necessarily mean "to tape". Instead it means "to the backup software" which is responsible for managing the backup data. Common scenarios involve backing up the full backups via SAN directly to tape and backing up the archivelogs or incremental backups over LAN which will be stored by the backup software on a hard disk and later copied and/or moved on to tape. The data flow (to SAN / to disk / whereever) is solely controlled by the backup software.
The advantage here is one continuous backup and restore job. The backup software deals with "where is my saveset located" and requests automatically the needed tapes or disks in recovery scenarios. This makes recoveries far more flexible and comfortable.
Regarding the throughput i have set up a rather large OLTP database ( 12 TB currently) which is backed up with EMC Networker. Full backups are written via SAN directly to tape. The average speed with four LTO-3 drives is approx. 550 MB/s (the tape drives compress the data in hardware; the database itself is text-only and seems rather good compressable). I guess thats not too bad.
you can also compress the BACKUPSETS (this generates a little more CPU but less network IO)He said he is on HP-UX. These kind of CPUs tend to be not that fast. Using compression is an option worth testing but there is another point to test when doing compressed backups: The RESTORE TIME.
Ronny Egner
My Blog: http://blog.ronnyegner-consulting.de

RMAN BACKUP VERY SLOW

Hi all,
what is fastest method to take backup using rman
Thanks&Regards,
Mahesh

Hi Mahee,
Can you be little bit precise on you question?
1. Is it you are planning to take backups using RMAN or your scheduled backups are running slow on RMAN?
2. Please specify the type of backup.
I would first check with the network throughput and native transfer rate and compare them with the backup speed.
Also, tuning would largely depend on if you are using Synchronous and Asynchronous Disk I/O and thus enabling the db parameters for the same.
While the job is running, execute a script containing the following SQL statement to know the status of the RMAN job:
SELECT sid, serial#, context, sofar, totalwork,
round(sofar/totalwork*100,2) "% Complete"
FROM v$session_longops
WHERE opname LIKE 'RMAN%'
AND opname NOT LIKE '%aggregate%'
AND totalwork != 0
AND sofar <> totalwork
If you repeat the query while the backup progresses, then you see output such as the
following:
SQL> @status
SID SERIAL# CONTEXT SOFAR TOTALWORK % Complete
8 19 1 10377 36617 28.34
SQL> @status
SID SERIAL# CONTEXT SOFAR TOTALWORK % Complete
8 19 1 21513 36617 58.75

RMAN Backup Issue when Full backup file was missing

Hi,
On : 11.2.0.2 version, Recovery Manager
RMAN Backup issue
Last week we had the NFS Issue where we backup the files onto NFS.
The problem occurred in the below sequence
Saturday the backup was successful
Saturday before deleting the backup files they are copied to tape
Deleting the backup files via OS command
Sunday Full backup started but due the NFS issue backup failed(Killed the instance and restarted)
Did the RMAN Incremental backup which worked on Monday
On Tuesday RMAN started complaining and started doing the Full backup.
no parent backup or copy of datafile 1 found
no parent backup or copy of datafile 3 found
no parent backup or copy of datafile 24 foundSony any idea why the Incremental backup worked on Monday but not on Tuesday
Regards
NM

Ok here is why I would like exact filenames..
1) to speed the time of recovery. I am much more familiar with traditional recovery methods than RMAN, and while I myself installed and suggested RMAN for backups, our other (11i) database does not use RMAN and so I am more familiar with traditional recovery. So to be able to recover quickly I want to have these files as close as possible to the original names so that I can use my standard script (from a trace file) to recreate the control fiile. If I can get RMAN to spit out the filies with original names but keep RMAN for making the backup, I may ditch the rman bacjup script in chron and write a traditional hot backup script which copies the files the old fashioned way.
2) to reduce cloning time. The RMAN duplicate command is not as good as I thought. I was actually easier for me to restore RMAN backups first to a box that has all the same paths, and THEN shutdown (cold) these files and copy them cold to another server, and restore from there. Agaiin if I can get the original file names, I could choose to do recovery either way (RMAN or traditional) in a real emergency instead of being forced to use rman.
3) to be able to switch to a backup file in the FRA without having to rename it. Seems logical if it is already named correctly.
thanks ! Marvi

Rman Backup of External Disk

Hi
We have an 3 Oracle 11.1 database on 3 different servers with Windows 2003.
We have a high speed USB External hard drive of Disk space about 2 TB .
I wanted to know is it a good idea to take a Rman backup every night on this external drive from all the three databases by sharing this drive .
Later this backs are manually copied to tapes.
Thanks

Hi,
You can take the backup but it will be very slow ( not like local harddisk)
You will see the significate wait event RMAN backup & I/O in AWR report.
You need crosscheck or validate the backup once its written to harddisk and again that may take more time
what i suggest is try it and if you are facing any problem , then don't continue.
Kind Regards,
Rakesh jayappa
Edited by: Rakesh jayappa on Sep 15, 2010 11:20 PM

Rman backup to disk 2 Minutes; Backup to tape hours

Solaris 10
Oracle 10gR2
MML Netbackup 6.0
I have the following scenario
Rman backup to disk < 2 Minutes; Backup to tape takes hours
and occassionaly fails with a media manager layer error.
Any suggestions to speed up the backup to tape?

A backup of under 2 minutes . . . not very big.
A backup to tape of hours?
I don't think that is your problem . . . I think you need to check and see if your tapes are valid. If Oracle fails at the end of a backup to tape, it sounds like the tapes are 'bad'.
If the tapes are good: Then look at why it is so slow - I would 'guess' network backup.
Can you backup to disk and then send them to tape?
Solaris 10
Oracle 10gR2
MML Netbackup 6.0
I have the following scenario
Rman backup to disk < 2 Minutes; Backup to tape takes
hours
and occassionaly fails with a media manager layer
error.
Any suggestions to speed up the backup to tape?

How can i do a RMAN backup of my database from the network ?

i'm using oracle 8i.1.7.3 with win server 2003
i want to know how can i do a RMAN backup of my database (sever machine A) from the network.
i'd like to save the backup in another machine (the same LAN, the same OS ).
to do that i've mapped a logical device in my comptur (z):
when i run rman command i got this error:
channel ORA_DISK_1: starting piece 1 at .......
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command ON ORA_DISK_1 channel at .......
00
ORA-19504: failed TO CREATE file "\\remote\save\"
ORA-27040: skgfrcre: create error, unable to create file
OSD-04002: unable to open file
O/S-Error: (OS 123) The filename, directory name, or volume label syntax is inco
rrect.

Hi,
ORA-19504: failed TO CREATE file "\\remote\save\"make sure you have created this directory and change it's ownership (chown command)to oracle.
also make sure that oracle user has permission to write to this direcotry (chmod command)
hope this helps
cheers, walrus

Can not recover table from rman backup

For testing I want to recover deleted table from rman backup.
I have make vm of oracle 11g. the following step i have applied but could not recover the table.
rman> backup database ;
On sqlplus create login as scott/tiger
create table scott.emp1(col1 varchar2(10));
insert into emp1(col1) value('Yasir ') ;
commit ;
select * from emp1 ;
it shows me one row successfully.
Now i have login the sys as sysdba
sqlplus> alter system switch logfile ;
after this i have drop the table .
Now to recover the table i have restored database on same vm.
rman>restore database ;
rman> recover database ;
rman> alter database open ;
on sqlplus i have issued
sqlplus> select * from scott.emp1 ;
table or view does not exist.
any help how to recover the deleted table from rman backup

Hi,
Check this test case
SQL> create table TEST2 as select * from emp;
Table created.
SQL> select count(*) from TEST2;
COUNT(*)
15
SQL> select TO_CHAR(SYSDATE,'DD-MON-YYYY HH24:MI:SS') from dual;
TO_CHAR(SYSDATE,'DD-
10-SEP-2013 10:57:05
SQL> alter system switch logfile;
System altered.
SQL> drop table TEST2 purge;
Table dropped.
SQL> shu immediate
[oracle@vnode MYSHELL]$ rman target /
Recovery Manager: Release 11.2.0.2.0 - Production on Tue Sep 10 10:58:39 2013
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: DDTEST (DBID=1667776968, not open)
RMAN> run{
set until time "to_date('2013 Sep 10 10:57','yyyy mon dd hh24:mi')";
restore database;
recover database;
alter database open resetlogs;
}2> 3> 4> 5> 6>
media recovery complete, elapsed time: 00:00:02
Finished recover at 10-SEP-13
database opened
RMAN> exit
SQL> set lin 200 pages 100
SQL> select count(*) from test2;
COUNT(*)
15
HTH

Unable to restore and recover my Database from RMAN Backup

Dear All,
Iam practicing RMAN in Windows environment.
My configurations are
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION ON; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON; # default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO 'F:\Backup\%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
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 'E:\ORACLE\DATABASE\SNCFORCL.ORA';
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT 'F:\Backup\%U.bak';
Then i took the RMAN backup, now iam shutdown my DB and removed one logfile..
then i tried to startup the DB but it is saying
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: 'E:\ORADATA\ORCL\REDO03.LOG'
So i tried to restore the Database with my rman backup
RMAN> restore database;
But i am unable to restore my logfile in the Datafiles location where as all other datafiles are restored but redo logfiles are not restored.
So, i am unable to recover my DB
Please tell me whether i am doing any mistake, what is the solution for my problem.
Thanks in advance
Mahi

All you restored was your datafiles.
Now issue recover database and that will apply the archive logs.
This is in the oracle documentation.
"You must restore backups of these archived logs for recovery to proceed. You can restore either to the default or nondefault location. If you do not have backups, then you must performing incomplete recovery up to an SCN before the first missing redo log and open RESETLOGS."
http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/osrecvry.htm
In this case after issuing restore database in RMAN, then issue this.
"Recover database"
It will then be an incomplete recovery. They should have been multiplexed. Did you restore your controlfile with this backup? You may have to issue an "Alter database open resetlogs;"

Create a new Database in an other server using a copie of RMAN backup

Hi all,
I want to create an other instance for our production database. We have disk and tape in rman backup. My question is can i create a new database using our disk backup in an other server?
If some procedure or steps is there, email it to my adresse [email protected]
Hamid.
Thanks

By means of the use of Recovery Manager it is possible to duplicate a database out from a previously taken rman backup. The method will be outlined in the next few lines.
Let's assume a source database named SRCDB and the target database, named GEMINI. A unix like environment is assumed, but it can be implemented on windows as well, just beware of the particular Oracle implementation on a windows platform (orapwd file name, service creation, path format)
1. Create a password file for the Cloned (GEMINI) instance:
orapwd file=/u01/app/oracle/product/9.2.0.1.0/dbs/orapwGEMINI password=password entries=10
2. Configure tnsnames.ora and listner.ora
Properly identify the database at the tnsnames.ora and have the instance manually registered against the listener.ora files, both files located at the $ORACLE_HOME/network/admin directory.
2.a Manually register the database against the listener (listener.ora)
(SID_DESC =
(ORACLE_HOME = /u01/app/oracle/product/9.2.0.1.0)
(SID_NAME = GEMINI)
2.b Added the target GEMINI to the tnsnames.ora
GEMINI =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = myhost.mydomain.com)(PORT = 1521))
(CONNECT_DATA =
(ORACLE_SID = GEMINI)
2.c Reload the listener
lsnrctl reload
3. Create a new init.ora for the cloned database.
Next create an init.ora file for the cloned database. In case the same paths cannot be used on the target host, either because it is the same source host or because those paths are not reproducible on the target, then DB_FILE_NAME_CONVERT and LOG_FILE_NAME_CONVERT may be required to be defined
DB_NAME=GEMINI
CONTROL_FILES=(/u02/oradata/GEMINI/control01.ctl,
/u02/oradata/GEMINI/control02.ctl,
/u02/oradata/GEMINI/control03.ctl)
# Convert file names to allow for different directory structure.
DB_FILE_NAME_CONVERT=(/u02/oradata/SRCDB/,/u02/oradata/GEMINI/)
LOG_FILE_NAME_CONVERT=(/u01/oradata/SRCDB/,/u01/oradata/GEMINI/)
# block_size and compatible parameters must match those of the source database
DB_BLOCK_SIZE=8192
COMPATIBLE=9.2.0.0.0
4. Connect to the cloned instance
ORACLE_SID=GEMINI; export ORACLE_SID
sqlplus /nolog
conn / as sysdba
5. Create an SPFILE based on the init.ora
CREATE SPFILE FROM PFILE='/u01/app/oracle/admin/GEMINI/pfile/init.ora';
6. Start the database in NOMOUNT mode:
STARTUP FORCE NOMOUNT;
7. Connect to the TARGET, CATALOG and AUXILIARY databases.
By means of the rman three connections are open, one for the Source Database (SOURCEDB), another for the Catalog database (RCAT), and one more for the cloned database (GEMINI)
ORACLE_SID=GEMINI; export ORACLE_SID
rman TARGET sys/password@SRCDB CATALOG rman/rman@RCAT AUXILIARY /
8. Complete or Incomplete clone (recover)
From the rman the database using one of the following commands:
8.a Clone the database by means of a complete recover.
DUPLICATE TARGET DATABASE TO GEMINI;
8.b Clone the database up to a defined point in time in the past by means of an incomplete recover
DUPLICATE TARGET DATABASE TO GEMINI UNTIL TIME 'SYSDATE-2';
9. Process finished.
Once the process is finished, the newly created GEMINI database is ready to be used as an independent new cloned database.
Ref. RMAN Clone a Database
~ Madrid

I am getting below error while taking RMAN backup.

Friends,
I am getting below error while taking RMAN backup.
The issue is related with a lock while trying to backup the controlfile.
The lock is more likely caused by the autobackup controlfile process started just before RMAN process was also trying the backup controlfile as shown in the following alert.log excerpt.
Starting Control File and SPFILE Autobackup at 2009-04-07 09:24:58
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of Control File and SPFILE Autobackup command on ORA_DISK_1 channel at 04/07/2009 09:25:03
ORA-00230: operation disallowed: snapshot control file enqueue unavailable
Is there anyway to solve this issue?Thanks in advance.

Hi,
SQL> SELECT s.sid, username AS "User", program, module, action, logon_time "Logon", l.*
FROM v$session s, v$enqueue_lock l
WHERE l.sid = s.sid and l.type = 'CF' AND l.id1 = 0 and l.id2 = 2; 2 3
no rows selected
Oracle version : 10.2.0.3
I am getting this error once in a month not everyday.
Starting Control File and SPFILE Autobackup at 2009-04-07 09:24:58
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of Control File and SPFILE Autobackup command on ORA_DISK_1 channel at 04/07/2009 09:25:03
ORA-00230: operation disallowed: snapshot control file enqueue unavailable
Please suggest me based on this..Thanks in advance..

RMAN Backup Speed

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