Hot Backup Of Database

How much time would oracle take if I take Hot Backup (using Imp/Exp statement) of a 60 GB database? Are there some other ways also of taking Hot BackUp ? How much would it effect oracle's performance while backup is taking place as the database is 24 x 7 and is taking uploads every few seconds?

Do not use IMP/EXP as a backup strategy. These utilities are intended for moving data about. Backup means taking a copy of the OS files - data files, redo logs, etc. To find out more please read the docs.
Cheers, APC

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When i start my hot backup my database getting very slow

Hi,
I am using following commands for enabling hot backup
SQL>ALTER SYSTEM ARCHIVE LOG CURRENT;
SQL>ARCHIVE LOG LIST;
SQL >ALTER DABATBASE BEGIN BACKUP;
Database altered.
SQL>SELECT FILE#,STATUS FROM V$BACKUP;
FILE# STATUS
1 ACTIVE
2 ACTIVE
3 ACTIVE
4 ACTIVE
and using cp -rp command to copy the file (backup copying speed good) but database performance very slow
How to improve performance ...
Regards
Vignesh C

Uwe Hesse wrote:
It is very likely that you experience slow performance with ALTER DATABASE BEGIN BACKUP , because until you do ALTER DATABASE END BACKUP , every modified block is additionally written into the online logfiles . Doesn't that happen only the first time the block is modified?
>
The command was introduced for split mirror backups, when this period is very short. Else ALTER TABLESPACE ... BEGIN/END BACKUP for every tablespace one at a time reduces the amount of additional redo during non-RMAN Hot Backup. There appear to be only 4 files. We don't know how big or sparse they are.
>
RMAN doesn't need that at all - much less redo - and also archive - generation then.
Furthermore, you can use BACKUP AS COMPRESSED BACKUPSET DATABASE to decrease the size of the backup even more - if space is an issue.
In short: Use RMAN :-)
Agree with that! Unless the copy is actually going to an NFS mount or something, where I would be concerned whether it is the type of NFS that Oracle likes. I'd also advise a current patch set, as the OP didn't tell us the exact version, and I have this nagging unfocused memory of some compression problems of the "oh, I can't recover" variety.
I'd like to see some evidence on I/O and cpu usage before giving advice. When I used to copy files like this, it would choke out everyone else. RMAN was a savior, but had to wait for local SAN upgrade.

Why we cannot take hot backup if database is in noarchive log mode

Hi,
I am aware that if database is in noarchive log mode, we cannot take hot backups and only cold backup is possible.
I would like to know the technical reason behind this restriction?
Thank You
Sarayu

Hot backups are fuzzy backups, inconsistent, in other words, since something is always happening in the database. When you recover, you restore data files and then apply redo to make the transactions consistent. You can do a complete recovery or recover to a point in time. So where does the redo come from? That's what we call archiving redo logs. When the online redo gets full, it gets archived.
In the case of an instance crash, the redo is there in the online redo logs, so Oracle can recover automatically. Anything beyond that, having to do with storage media, is a media recovery, and requires those archived logs. So unless you have some other way to get your data back, always run in archivelog mode.
It is really important to understand the concepts. Please read the docs.
http://docs.oracle.com/cd/E11882_01/server.112/e25789/cncptdba.htm#CNCPT031
http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmintro.htm#i1005488
It may be worth your while to get a third party backup and recovery book too.

Hot Backup for oracle database?

Dear all,
I want to change Cold Backup to Hot Backup. Does anyone how to do Hot Backup and has some simple document I can follow? If the database is running in ARCHIVELOG mode, is the size grow very fast or other effect will overcome?
Please advice,
Amy

I want to change Cold Backup to Hot Backup. Does
anyone how to do Hot Backup and has some simple
document I can follow?online/hot backup don’t need to shutdown the database we can put the database in backup mode and then start taking backup even though users database activity read/write data going on. This strategy useful if ours database goes for 24x7.
For online/hot backup the database should be in archive mode.
I hope you know how to turn on archive.Before turning on check the archive on or not.
SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     1
Next log sequence to archive   2
Current log sequence           2
SQL> you may also check it by connecting to database as sys
SQL> select log_mode from v$database;
LOG_MODE
ARCHIVELOG
SQL> if yours database is not in archive mode then first enable archive,please before turning on the archive take cold backup.
SQL>shutdown immediate
SQL>startup mount
SQL>alter database archivelog
SQL>alter database open;
SQL> archive log list
Now you are able to take hot/online backup ,its upto you you use user managed backup and recovery or use RMAN oracle own shipped free tool for backup and recovery ,however my recommendation would goes for RMAN.
http://download-uk.oracle.com/docs/cd/A97630_01/server.920/a96572/toc.htm
http://www.oracle.com/technology/deploy/availability/htdocs/rman_overview.htm
ARCHIVELOG mode, is the size grow very fast or other
effect will overcome?However, the growing size pace either fast or slow everyday can be impractical it alls depends on activity of yours database operation.You will have to observe it yourself by turning on archive log its vary database to database activity.
Khurram

Need some advice about hot backup under linux

hi, I want some advice about db files hot backup between two machines(Named A and B).A is primary machine which will write and read database and have the lastest db file. B is backup role and no database file in it.
Now I want hot backup A's db file to B in order to B have the lastest db file too.
At A,my db file support transaction and environment, and I set autoremove unnecessary log files.
The code such as follows:
dbenv->set_flags(dbenv, DB_AUTO_COMMIT |DB_LOG_AUTOREMOVE | DB_TXN_WRITE_NOSYNC, 1);
ret = dbenv->open(dbenv, NULL,
DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN ,0)
I don't want to use db_hotbackup utility. and db_hotbackup may be backup files to the same machine with different dir.
How can I make machine A's db files backup to machine B.
Thanks for your help.
Best Regards
hangsy

Hi Hangsy
Now I want hot backup A's db file to B in order to B
have the lastest db file too.What do you mean? Do you want to have the latest version... from when you did the latest backup, or you want to keep it updated in the same time with the main database?
I don't want to use db_hotbackup utility. and
db_hotbackup may be backup files to the same machine
with different dir.You can copy the backup anywere you want.
If you want to run recovery on a different machine, it must be the same pointer size and endianness as the original machine.
Database and log file archival: http://www.oracle.com/technology/documentation/berkeley-db/db/ref/transapp/archival.html
It is usually simpler to take the hot backup on the main machine and run recovery there before copying the databases to the remote system.
In this setup, only the databases are required on the remote system, not the log files.
Since you are using NOSYNC, you should run a checkpoint which will ensure you that the database files are up to date.
Please read "Recovery procedures" ( http://www.oracle.com/technology/documentation/berkeley-db/db/ref/transapp/recovery.html ) first. "you cannot perform a hot backup of databases and log files, restore the backup and then run normal recovery -- you must always run catastrophic recovery when using hot backups."
Regards,
Bogdan Coman

How to take a Hot backup of Oracle database

1: put the db in archive log mode
2: set the db_sid to correct one
3: login to sqlplus
4: verify the name of the db that you are connected to
select name from v$database;
5: check if the db is in archive log made
select log_mode from v$database;
if not in archive log mode
another command to check
archive log list;
6: find where on disk oracle writes archive log when it is in archive log mode
sql> show parameter log_archive_dest_1;
if the value is found to be 0, that means no values will be recorded, so we need to change it
sql> alter system set log_archive_dest_1='LOCATION=c:\database\oradata\finance\archived_logs\'
scope=spfile;
7: shutdown immediate; < this is done just to prepare the db for hot backups >
8: startup the db in mount mode
startup mount;
( 3 startup types : nomount - just starts the instance, mount - locates the control files and open up according to the values, open - finds the datafiles from the control files and opens up the db )
9: put the db in archive log mode
alter database archivelog;
10: open the database
alter database open;
11: check the status of the db
select log_mode from v$database;
SQL> archive log list;
12: create a directory for archived log
check if its empty, if empty we need to switch
sql> alter system archive log current;
run it 5 times < need to put / and enter > , then check the archive log dir , we will find files
13: make a table in the database and insert data in it
create table employees (fname varchar(2));
check the table
desc employees;
insert values
insert into employees values ('Mica');
14: tablespace must be in hot backup mode
check the status
select * from v$backup;
if found not active, then we need to change
we cannot put the db in hot backup mode, unless it is archive log mode
change to hot backup mode
alter database begin backup;
check the status
select * from v$backup;
15: now we can only COPY DBF FILES
copy *dbf <distination location>
16: need to take the db out to hot backup mode
alter database end backup;
17: need to make another archive log switch
alter system archive log current;
18: need to copy control files now, need to do a binary bckup
alter database backup controlfile to '<location>\controlbackup';
19: insert more values to the table
insert into employess values ('NASH')
COMMIT;
make another archive log switch : alter system archive log current;
do the same process for more values
20 : backup all the archive logs to a new location
21: shutdown the db and simulate a hw error, delete all the files from the database folder
22: try to start the sqlplus and db ::: error
23: copy all the backups to the db dir
need to copy the control files, rename the binary backup of the control file and make the copies as needed
24: try to mount the db, error < must use reset logs or noreset logs >
25: need to do a recovering of the database
shutdown
restore the archive logs
startup mount;
recover database until cancel using backup controlfile;
it will ask for a log file :
yes for recovery
cancel for cancelling recovery
26: check status: open the database in readonly
alter database open read only;
check the tables to see the data
shutdown immediate
shartup mount;
recover again : recover database until cancel using backup controlfile;
if oracle is asking for a log that do nto exist , all we have to do is type cancel
27: open the database
alter database open;
need to do reset logs
alter database open resetlogs;
28: check the db that you are connected, check the tables
thanks and regards
VKN
site admin
http://www.nitrofuture.com

A very long list ... let me make it shorter.
SQL> archive log list;If I see this:
Database log mode No Archive ModeI put the database into archivelog mode and leave it there forever.
If it is in archivelog mode:
RMAN> TARGET SYS/<password>@<service_name> NOCATALOG
RMAN> BACKUP DATABASE PLUS ARCHIVELOG;Though there are a lot of things one could do better such as incrementals with block change tracking, creating an RMAN catalog, etc.

Is possible to recover hot.backup of a nonarchive database?

I have read on several books that hot backups must be done on a database set with ARCHIVELOG mode, but it is physically possible to recover a hot-backup of a database that was in NOARCHIVELOG mode. Obviously some transactions would be lost, but it is possible to do it?
I'm trying to do it unsuccesfully (when I try to startup the data base he asme for recovering the database and then always ask me for a archive log file.......)
Thanks

What you have red is correct.
You can't do hot backup on non-archivelog database.

Hot backups for essbase planning databases

Hi gurus
Can please tell me best advice for making hot backups of our essbase planning databases for disaster recoveries?
We try doubletake but files are locked unless essbase is put in read-only mode.
Any good tools for this? Certified stuff? Heard maybe VBE?
TIA
M.

Hi,
First of all have you read the document of backing up essbase :- http://download.oracle.com/docs/cd/E10530_01/doc/epm.931/hfm_backup.pdf
If you are taking a backup while essbase is running then you will need to put the databases into read only mode, this can be done by using a maxl script and once again to take it out of read only mode.
There are lots of 3rd party applications out there for backing up file structures, it all depends on what you want it to do and how much you want to pay.
If it is a small installation you could even script it yourself depensing on your knowledge to back up files and copy them to a san or backup drive.
Cheers
John
http://john-goodwin.blogspot.com/

HOT Backups for smaller databases

Should we schedule hot backups for small databases? the database size is around 1.5 GB. We have already scheduled daily FULL DB Export.
The database is Oracle 8i.

RMAN> run {
2> allocate channel ch1 type disk format 'e:\rman_backup\backup%d_DB_%u_%p';
3> backup database;
4> backup archivelog all;
5> release channel ch1;
6> }
RMAN-03022: compiling command: allocate
RMAN-03026: error recovery releasing channel resources
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure during compilation of command
RMAN-03013: command type: allocate
RMAN-06172: not connected to recovery catalog database
RMAN>

Problem to copy database from the hot backup

Oracle9i Enterprise Edition Release 9.2.0.4.0
SunOS 5.8
Hi all,
I wrote the UNIX script to copy the production Oracle 9i database from the hot backup to the Oracle 9i development database. I already did it manually without any problems using Metalink document Note:18070.1
The script stops after the command
recover database until cancel using backup controlfile ,
because I have to apply all archived logs manually.
How is it possible to get rid of this problem and automatically apply archived logs?
Thank you in advance for your help.
Alex
P.S. We are not authorized to use RMAN.

P.S. We are not authorized to use RMAN. We dont get your point?
Who stops you using RMAN?
How did you take the hot backup then?
There are couple of good notes on metalink, and below is one of them,
RMAN Duplicate Database in Oracle9i / Oracle 10G Doc ID: Note:228257.1
Jaffar

How to restore RMAN hot backup to another database on another server?

I want to know how to restore RMAN hot backup from production server to another database on a testing server.
The hot backup is from a database named PROD on the production server
The database to be restored with the hot backup is TEST on the testing server. There is already a PROD database on the testing server and this PROD database must be kept.
I have read some threads about changing initTEST.ora to PROD to restore such backup but (I think) will not work in my case since I already have a PROD database on the testing server.
The version is 11gR2 on Linux but the compatible parameter is set to 10.2.0.1.0.
Thanks for any help.

Hi,
Since you are on 11g, hope this helps you http://shivanandarao.wordpress.com/2012/04/28/duplicating-database-without-connecting-to-target-database-or-catalog-database-in-oracle-11g/
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Creating RAC database thru RMAN hot backup

Hi Guys,
I am having ERP PROD database on 2 nodes 116 and 117(RAC) server. We have a scheduled RMAN HOT backup of this database
WE also have ASM implemented.
We have another 2 servers named 36 and 37(RAC and ASM) which has ERP Test Database and the thing is that we want to refresh this
test database using ERP PROD RMAN backup.
Can someone please post the proper steps to restore the RMAN backup to ERP Test database as ASM is alos there.
As it is little urgent for us.
help will be appreciated.
Regards,
Milan Rathod

1. take the backup of production database
rman connect target /
backup as compressed backupset database plus archivelog format '/u01/db/backup/%d_%I_%s_%T';
move the backup to test server (same location /u01/db/backup/ bcoz rman checks for backupset in the same location only)
add the below two lines in the test database-- initTEST.ora file
comment cluster_ parameters in initTEST.ora file
eg:-
DB_FILE_NAME_CONVERT = (+EBAOUATDATADG1/prod/,/u01/db/app/admin/test/)
LOG_FILE_NAME_CONVERT = (+EBAOUATDATADG1/prod/,/u01/db/app/admin/test/)
check the connectivity between prod and test database.
from test
$tnsping PROD
from prod machine
$tnsping TEST
in test server
startup nomount
rman target sys@proddb auxiliary /
duplicate target database to test;
after completion of duplicate/clone step convert the single instance test to rac instance by uncomment the cluster_ parameters in initTEST.ora parameter
startup mount the second node in TEST
ALTER DATABASE ENABLE PUBLIC THREAD 2 ;
alter database open;
hope, this will helps you.
Good Luck

Hot backup centralized of database distributed

I will like to know if it is possible to make a hot backup of the data base distant
help!

you might want to elaborate what you plan to do. What's the OS ?
Can you connect remotely to server to run the backup job, but the actual job will be run locally on server.

Unique Error while doing hot backup Cloning!

Dear All,
I am using EBS 11.5.10.2 with DB 9.2.0.6.
I am doing hot backup cloning by referring *[Cloning Oracle Application 11i /R12 with Rapid Clone - Database (9i/10g/11g) Using Hot Backup on Open Database|https://metalink2.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=760772.1]*
I am facing a unique issue, when I run adcfgclone.pl dbconfig <my_context_file>, application of my Production Server start misbehaving and it gives me an error:
Node Id does not exist for the current application server id.When I check the FND_NODE table I found that there server id was empty in it.
I have to run than run the following steps as the resolution:
1. Shutdown all the services.
2. EXEC FND_CONC_CLONE.SETUP_CLEAN;
3. COMMIT;
4. Run AutoConfig on all tiers, firstly on the DB tier and then the APPS tiers,to repopulate the required system tables.
5.start all the services and verify the issue.
Than application behaves normally.
Is there any additional step to be followed while Hot Backup Cloning other than mentioned in the above mentioned ML Doc?
Please suggest,
Anchorage :)

I am facing a unique issue, when I run adcfgclone.pl dbconfig <my_context_file>, application of my Production Server start misbehaving and it gives me an error:
Node Id does not exist for the current application server id.Where did you get this error?
This is very strange, how come this happens in Production, when you are doing cloning in TEST/DEV instance.
Is there any additional step to be followed while Hot Backup Cloning other than mentioned in the above mentioned ML Doc?I feel there are no other additional steps, as I Recently did successfully hotbackup cloning using the same document.

How to find out which archived logs needed to recover a hot backup?

I'm using Oracle 11gR2 (11.2.0.1.0).
I have backed up a database when it is online using the following backup script through RMAN
connect target /
run {
allocate channel d1 type disk;
backup
incremental level=0 cumulative
filesperset 4
format '/san/u01/app/backup/DB_%d_%T_%u_%c.rman'
database
}The backup set contains the backup of datafiles and control file. I have copied all the backup pieces to another server where I will restore/recover the database but I don't know which archived logs are needed in order to restore/recover the database to a consistent state.
I have not deleted any archived log.
How can I find out which archived logs are needed to recover the hot backup to a consistent state? Can this be done by querying V$BACKUP_DATAFILE and V$ARCHIVED_LOG? If yes, which columns should I query?
Thanks for any help.

A few ways :
1a. Get the timestamps when the BACKUP ... DATABASE began and ended.
1b. Review the alert.log of the database that was backed up.
1c. From the alert.log identify the first Archivelog that was generated after the begin of the BACKUP ... DATABASE and the first Archivelog that was generated after the end of the BACKUP .. DATABASE.
1d. These (from 1c) are the minimal Archivelogs that you need to RECOVER with. You can choose to apply additional Archivelogs that were generated at the source database to contininue to "roll-forward"
2a. Do a RESTORE DATABASE alone.
2b. Query V$DATAFILE on the restored database for the lowest CHECKPOINT_CHANGE# and CHECKPOINT_TIME. Also query for the highest CHECKPOINT_CHANGE# and CHECKPOINT_TIME.
2c. Go back to the source database and query V$ARCHIVED_LOG (FIRST_CHANGE#) to identify the first Archivelog that has a higher SCN (FIRST_CHANGE#) than the lowest CHECKPOINT_CHANGE# from 2b above. Also query for the first Archivelog that has a higher SCN (FIRST_CHANGE#) than the highest CHECKPOINT_CHANGE# from 2b above.
2d. These (from 2c) are the minimal Archivelogs that you need to RECOVER with.
(why do you need to query V$ARCHIVED_LOG at the source ? If RESTORE a controlfile backup that was generated after the first Archivelog switch after the end of the BACKUP ... DATABASE, you would be able to query V$ARCHIVED_LOG at the restored database as well. That is why it is important to force an archivelog (log switch) after a BACKUP ... DATABASE and then backup the controlfile after this -- i.e. last. That way, the controlfile that you have restored to the new server has all the information needed).
3. RESTORE DATABASE PREVIEW in RMAN if you have the archivelogs and subsequent controlfile in the backup itself !
Hemant K Chitale

Hot Backup Of Database

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