Oracle Hot Backup Confusion

Hi everybody,
This is regarding a confusions on Oracle Hot-Backup.
Suppose i have 3 Online Redo Logs and i have put a tablespace in Backup Mode.
So as a result whatever changes are made,Oracle will start generating redo for the entire block so as to avoid Fractured Blocks.
Wat my Question is what if,while in the process of doing this all my Online Redo Logs files/members gets filled up how do then Oracle Manage to go ahead and keep recording the Transactions/Changes made to a Certain Block in the Tablespace.
1.>Does Oracle Perform a Recovery from the Archived Redo Logs once the Tablespace taken out Backup Mode.
2.>Or is there a reclamation/Re-sizing of On-line redo log file Space from other Segments.
Thanks & Regards,
Prosenjit Mukherjee.

>
I am not even sure that what the #2 means! Anways!
Suppose i have 3 Online Redo Logs and i have put a tablespace in Backup Mode.It doesn't matter how many redo log groups you have and AFAIK this has no relation with a tablespace being in the backup mode whatsoever.
So as a result whatever changes are made,Oracle will start generating redo for the entire block so as to avoid Fractured Blocks.Partially correct! The whole block gets copied only for the first time . For subsequent changes, only the change vectors go into the log buffer and then from there, to the redo log files. This is exactly equivalent to what does happen without a tablespace being not in the backup mode.
Wat my Question is what if,while in the process of doing this all my Online Redo Logs files/members gets filled up how do then Oracle Manage to go ahead and keep recording the Transactions/Changes made to a Certain Block in the Tablespace.What does this mean exactly? If you fill up the redo logs, log switch will follow making teh LGWR switching from the current redo log group to the next, triggering checkpoint which would make the DBWR write the buffers to the datafile. I am not sure what is the confusion?
Edit: I apologize , I read this point a little too fast! If all the log files are going to be filled up, database would be hung. There won't be any more transactions allowed as there is no place to write their change vectors anywhere. Sorry , I understood in the first time that you were talking about the standard log switching.
1.>Does Oracle Perform a Recovery from the Archived Redo Logs once the Datafile is taken out Backup Mode.What recovery? Before the files go into the backup, there is a "global checkpoint" that is performed for them , pushing all of their buffers from the cache to them and then after the checkpoint is freezed for them, yet letting them do all the read/write operations. Once they come out of the backup mode, when the next time a checkpoint is performed, then their number gets synched with the rest of the database. From where the recovery comes into the picture here?
2.>Or is there a reclamation/Re-sizing of On-line redo log file Space from other Segments.As I said before, I didn't understand at all what this point even means?
HTH
Aman....
Edited by: Aman.... on Oct 24, 2009 9:19 PM added Edit

Similar Messages

Oracle Hot Backup Script Windows Server 2003

Hello,
Does anyone here have a working Oracle 10I database hot backup script for Windows Server 2003? If so can you please post it here.
Thanks.

Here is a basic batch script I have used for a hot backup of Oracle databases using RMAN
Will just need to update some locations based on you environment just check all the comments and change what you need to but this can be scheduled to run regularly through the windows scheduler for database backups.
This will take a hot backup and backup the archive logs.
Let me know if you have any quesitons.
REM #####################################################################
REM # Name: rman_hot_backup_dsk.bat
REM #
REM # Description:
REM #
REM # Generic Hot backup script that accepts the SID
REM #
REM # Parameters: Instance Name, backup level
REM #
REM #####################################################################
REM #
REM # Check if SID was Passed
if (%1)==() goto USAGE
if (%2)==() goto USAGE
REM # assign ORACLE_SID to passed SID
set ORACLE_SID=%1
REM # Set the hot backup level 0-full 1-incremental
set LEVEL=%2
REM # export the page list
set [email protected]
REM # assign a date we can use as part of the logfile
set DTE=%date:~-4%%date:~4,2%%date:~7,2%_%time:~0,2%%time:~3,2%%time:~6,2%
REM # Take the spaces out of the date string so we can use in our file name
set DTE=%DTE: =%
REM # set the script location
REM # Set location of where you will put script
set SCRIPTLOC=C:\app\oracle\scripts
cd %SCRIPTLOC%
REM # Set the Temporary command file that we will write our rman script to
set CMDFILE=%SCRIPTLOC%\%ORACLE_SID%_rman_hot_backup_dsk.cmd
REM # Remove the temporary file if it exists
del /q %CMDFILE%
REM # Set the logfile directory
REM # Change based on where you want the backup logs to go
set LOGPATH=W:\ORACLE_BACKUP\logs
set LOGFILE=%ORACLE_SID%_rman_hot_backup_dsk_%DTE%.log
set LOG=%LOGPATH%\%LOGFILE%
REM # Set the path of the backup location
REM # Change based on disk pach for you disk based backups
set BACKLOC=\\VirtualBox\ORA_ITS03P\ORACLE_BACKUP\%ORACLE_SID%
REM # Lets set the ORACLE_HOME for the host
REM # Set to your actual ORACLE_HOME location
set ORACLE_HOME=C:\app\oracle\product\10.2.0\db_1
# Set the rest of the Oracle Environment
# based on our ORACLE_HOME
set LIBPATH=%ORACLE_HOME%/lib
set LD_LIBRARY_PATH=%ORACLE_HOME%/lib
set TNS_ADMIN=%ORACLE_HOME%/network/admin
REM #set ORA_NLS10=%ORACLE_HOME%/nls/data
REM Set our PATH with the ORACLE_HOME so that we have a good
REM clean environment to work with
set PATH=%ORACLE_HOME%/bin;%ORACLE_HOME%/OPatch;%PATH%
REM # Write Temporary command file for RMAN backup
echo # configure retention policy >> %CMDFILE%
echo CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 14 DAYS ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # lets start clean for our hot backup by doing full crosschecks >> %CMDFILE%
echo change archivelog all crosscheck ; >> %CMDFILE%
echo crosscheck backup of database; >> %CMDFILE%
echo crosscheck backup of controlfile; >> %CMDFILE%
echo # >> %CMDFILE%
echo # delete all expired and obsolete backups >> %CMDFILE%
echo allocate channel for maintenance type disk ; >> %CMDFILE%
echo delete noprompt expired archivelog all ; >> %CMDFILE%
echo delete noprompt expired backup ; >> %CMDFILE%
echo delete noprompt obsolete ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Configure control file for auto backup >> %CMDFILE%
echo configure controlfile autobackup on ; >> %CMDFILE%
echo CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%BACKLOC%\%ORACLE_SID%_controlfile_%%F' ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Configure default device type here we use disk and set parallelism to 2 >> %CMDFILE%
echo configure default device type to disk ; >> %CMDFILE%
echo configure device type disk parallelism 2 ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Must format the default channel for the device type disk >> %CMDFILE%
echo # other wise tmp area in creating pieces will be done in >> %CMDFILE%
echo # the $ORACLE_HOME/dbs directory >> %CMDFILE%
echo CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT = '%BACKLOC%\%ORACLE_SID%_hot_%%U' ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Configure our retention policy for this database >> %CMDFILE%
echo configure retention policy to recovery window of 14 days ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Let configure our channels for our backup >> %CMDFILE%
echo # Channel 1 disk and we indicate where it goes not taking the default >> %CMDFILE%
echo configure channel 1 device type disk MAXPIECESIZE = 4G format '%BACKLOC%\%ORACLE_SID%_hot_%%U' ; >> %CMDFILE%
echo # Channel 2 disk and we indicate where it goes not taking the default >> %CMDFILE%
echo configure channel 2 device type disk MAXPIECESIZE = 4G format '%BACKLOC%\%ORACLE_SID%_hot_%%U' ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Backup our database with compression on >> %CMDFILE%
echo backup as compressed backupset incremental level %LEVEL% tag hot_%LEVEL%_%DTE% DATABASE ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Backup our archive log files that have not been backed up >> %CMDFILE%
echo backup as compressed backupset format '%BACKLOC%\%ORACLE_SID%_Archive_%%d_%%s_%%p_%%t' archivelog all not backed up 1 times ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # Backup Control file for standby in case needed >> %CMDFILE%
echo backup current controlfile for standby ; >> %CMDFILE%
echo # >> %CMDFILE%
echo # let put a controlfile to trace >> %CMDFILE%
echo sql 'ALTER DATABASE BACKUP CONTROLFILE TO TRACE' ; >> %CMDFILE%
REM # Run the RMAN backup without using the recovery catalog
%ORACLE_HOME%\bin\rman target=/ nocatalog cmdfile=%CMDFILE% msglog=%LOG%
REM # Remove our temporary command file
del /q %CMDFILE%
REM # Mail Archive backup log
REM # This relies on the free bmail utility
bmail -date -m %LOG% -f [email protected] -s <smtpserver> -t %PAGE_LIST% -a "HOT Backup results"
REM # Goto end of script as we are done
goto END
:USAGE
echo "Must Pass ORACLE_SID and hot backup level as parameters."
goto END
:END

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.

Which is better for User Managed Hot backup - running in cron or oracle scheduler

We are taking hot backup in our environment by using sql script of just begin backup, host copy and end backup
Can we use this script to be put in cron for weekly two times or to use oracle scheduler .
Which is better option and why?

The answer to your question depens on your condition. Do you have more experienced Unix admin or DBA?
From my point of view cron is better becuase all you need is SQL*Plus utility and shell script:
export ORACLE_SID=...
sqlplus <username>/<password> as sysdba <<EOF
ALTER TABLESPACE .. BEGIN BACKUP;
host copy ..
ALTER TABLESPACE .. END BACKUP;
EXIT
EOF

Hot backups in Oracle 10g R2

Hi
How to take up Hot backups (On-line backup) in Oracle 10g Release 2 in Windows environment.
Pls give me the link or steps for do the hot back-ups.
Thanks

I think you are test ENV?
Did you archive the current log file which i mentioned in the earlier post
if so and if you the archived log
Shutdown the DB
Rename the file you copied
move the D:\oradata\*.dbf(whihc was backed up by you)in the original directory and
from sqlplus issue
SQL>startup mount
SQL>recover database
this hould work
But make sure you have the backup before deleting/renaming the the file you backed up by HOTbackup

Hot Backups - Oracle 9i, 10g and 11g

Are all hot backups run outside of RMAN as an OS file copy? If so, isn't this a very risky exercise.
I understand that RMAN will check for corruption where as hot backups won't. RMAN can also track backups in a recovery catalog.
If using a hot backup, it seems like corrupt data could be backed up with the good data.
What exactly are the advantages of using a hot backup. It is understood that the databases can be up during a hot backup, but can't they also be up with an incremental RMAN backup?

I think you need to read the documentation again. Check on tahiti.oracle.com
A cold backup is when the database is shutdown (can be done by file copy or rman)
A hot backup is when the database is running (can be done by file copy or rman)
RMAN has the advantages of backing up at block level, and going directly to tape, and compression, and incremental backup, and block checking, and backup from ASM, and catalog ......
File copy has the advantage of being logically simple (e.g you can see exactly what is happening when you copy a file).

How to Restore datas in Oracle 10g using hot backup?

I did Hot backup things (On-line backup) in Oracle 10g (Windows environment)
Now backup files are stored in physical location..
How to restore the datas to original location..
Can any one give the url or command for recovery in ora 10g for hot backup
Thanks

Please do not dump all of your work in this forum, and expect volunteers to do it for free!!!
Dear Great Senior DBA Sybrand Bakker
What are Oracle Discussion Forums?
Oracle Discussion Forums is an interactive community for sharing information, questions, and comments about Oracle products and related technologies. Most forums are moderated by product managers, and all of them are frequently visited by knowledgeable users from the community
oracle forums is not your place for showing “bossing” it is a place where junior to seniors share there knowledge and advices, it means helping and sharing….. Knowledge is for giving ….giving only it will increase… don’t discourage any one like this ……
There are my Great Seniors (not like u) mainly respected Mr. Jonathan Lewis, Mr. Don Burleson and a lot of oracle nominated ACE members are all giving patiently replay to jr. to sr.
Obeasley oracle doubts are mostly related to practical issue only……
Pls try to learn the word meaning of “volunteers”

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

Where is the official Oracle documentation that describes Hot Backup?

I have used the woefully inadequate Metalink search utilities and Google but the nearest thing I have found is a description on "Ask Tom".
I am looking for the official Oracle documentation that describes what happens internally during a Hot Backup. There are a lot of web sites and blogs out there that describe it but I am looking for the description from Oracle themselves. The only things I have found in the Oracle documentation so far is how to start and stop Hot Backup but not what happens internally. Preferably 11gR2 if it makes any difference.
Thanks in advance.

Thanks mseberg. This is what I was looking for. I had read this manual before but apparently glossed over this paragraph:
"When performing a user-managed online backup, you must place your datafiles into
backup mode with the ALTER DATABASE or ALTER TABLESPACE statement with the
BEGIN BACKUP clause. When a tablespace is in backup mode, the database writes the
before image for an entire block to the redo stream before modifying a block. The
database also records changes to the block in the online redo log. Backup mode also
freezes the data file checkpoint until the file is removed from backup mode. Oracle
Database performs this safeguard because it cannot guarantee that a third-party
backup tool copies the file header before copying the data blocks."
Hot backup is still quite useful and Rman doesn't cover all cases. What we are doing with it is using storage-based replication (Shadow Image) to another set of LUNS which we then mount on another server and backup using Rman. This removes the overhead of Rman on the Production Database server and extends our backup window to almost 24 hours.

Implementing Hot Backups

HI ,
i am new to the idea of hot backups , so need abit of advice on how to implement them by using RMAN and User based techniques
a little bit abt my production environment
Oracle 9.2.0.6
EBS 11.5.10
OS is HP UX 11.11
earlier i used to get downtime of 2 hrs , so iused to cold backups wid RMAN as well OS based techniques , now due to 24 hr system requiremnt
i have to use hotbackups, DB size is 200GB, how can i use hot backups so as my system works efficiently without any extra load

Soli wrote:
Hi,
Each tablespace that needs to be backed-up must be switched into backup mode before copying the files out to secondary storage.
This can be done as shown below:
ALTER TABLESPACE xyz BEGIN BACKUP;
! cp xyfFile1 /backupDir/
ALTER TABLESPACE xyz END BACKUP;
The above would only be for user managed backups, which the OP has no reason to be doing. We should be guiding him in how to use rman, not in how to use obsolete techniques -- ESPECIALLY since he is new to the whole subject of backups and would easily be confused by mixing the techniques.
Recovery Manager command:
run {
allocate channel t1 type `SBT_TAPE';
backup
format `df_%s_%t'
(datafile 10);
When Recovery Manager executes the above command, it sends the Oracle backup request to the Oracle server performing the backup.
The Oracle server process identifies the output channel as the type `SBT_TAPE', and requests the Media Management Library to load a tape and write the output specified.
but ther you must ask sysadm which storage you use and how to backup there.
btw.
there is link how to setup RMAN
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/setup004.htm
Regards,
Tom
http://oracledba.cz

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

Question on recovery from Hot backup

Whenever I tried to recover from my hot backup using recover database untill cancel (or any other until option)..
I get messages similar to the following :
SQL> recover database using backup controlfile until cancel ;
ORA-00279: change 212733060 generated at 11/18/2008 23:50:58 needed for thread
1
ORA-00289: suggestion : /d01/oradata/devl/arc/1_282_667362770.dbf
ORA-00280: change 212733060 for thread 1 is in sequence #282
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/d01/oradata/devl/arc/1_282_667362770.dbf
ORA-00279: change 212733060 generated at needed for thread 2
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/d01/oradata/devl/arc/2_257_667362770.dbf
ORA-00279: change 212733060 generated at needed for thread 3
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/d01/oradata/devl/arc/3_258_667362770.dbf
ORA-00279: change 212733060 generated at needed for thread 4
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
I have all my archive files in the archive dest location.
Is there any way to prevent this warning messages and let oracle find all the archive files?
As you can see from the messages, Oracle is finding the correct file, then why there is an error message and why we have to provide the file names one-by one.
Please help !!!

Oracle will look for needed archive logfile from your log archive destination.
If you are sure all these files are under /d01/oradata/devl/arc/, you can input AUTO, Oracle will work down the list until done.

Complete Recovery from HOT BACKUP

One of our server had media failuer. We are rebuilding new server and reinstalling oracle on it. I have hot backup of instance which I would like to recover.
Can I have steps please. I will appreciate your help...!

Hi,
What is the OS and version of Oracle?
Do you have all the archivelogs after the hot backup? Is the backup a valid backup? Is it a RMAN backup or normal file system backup of the datafiles?
Regards,
Badri.

Recovery from hot backup

I have a problem with recovery hot backup from production database to test database and open it to use.
I have 'hot backup' without temporary tablespace and roll tablespace, I cant shut down production database (24x7), please give me a regulations how to recover database from hot backup, without online redo logs, temp tablespace, roll tablespace only with archive logs, and.....after this ..rename database sid.
Every time when I recovered database, it's still want to recover...and recover from archive logs and I cant open it, it's still inconsistent.Please send me an answer for [email protected]
thanks!

Hi,
What is the OS and version of Oracle?
Do you have all the archivelogs after the hot backup? Is the backup a valid backup? Is it a RMAN backup or normal file system backup of the datafiles?
Regards,
Badri.

Oracle Hot Backup Confusion

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