Online Backup is needed everyday??

Hello All,
For our ECC 6.0 System,OS=HP UNIX,Database=Oracle 9i
We are taking only Offline backup everyday...No Online backup is taken.Can we restore the system completely if it crashes??Is there any necessity to take the Online Backup daily??But we are taking File system Backup everyday from HP-Unix.What startegy is followed for SAP Best practise??

Hi,
back into the purpose of the backup : enable to restore data to its latest stable condition while system or database is crashed.
backup offline : you can restore database back only until the latest offline backup.
say you are doing the last offline backup on Dec 1, 2009, so if your system is crash now, you can only bring your system back to Dec 1, 2009. No matter if you are have full-set of archivelog, it will useless.
backup online : you can restore database back until the last archivelog you can save before crash.
say you are doing the last online backup this morning and regularly backup your archive log, so if your system is crash now, you can restore your online backup followed by applying your saved archivelog to bring your database to the latest condition (equivalent to the last archivelog you have). say the last online backup is 5AM this morning, and you backup archivelog every hour, and on on 7.15AM system is crash, you can restore online backup taken on 5AM, plus restoring (applying) archivelog on 6AM and 7AM, and then bring your database up. in this case, you may lost data from 7AM to 7.15AM if archivelog created during this time can't be save (during system/database crash). if you have enough time to save archivelog created between 7AM and 7.15AM, you can prevent or minimize data loss.
suggestion for you :
offline backup : once a week
online backup : once a day
archivelog oracle backup : every hour (or depends on how many archivelog created per hour on your system)
filesystem (vg00 or internal disk) backup : once a month, before applying patch and after applying patch
compared to our system:
offline backup : once a month (due to huge database we have)
online backup : once a day
archivelog oracle backup : every hour
filesystem (vg00 or internal disk) backup : once a month, before applying patch and after applying patch
remember, online backup without archivelog backup (on Oracle system) is nothing.
and filesystem (vg00 or internal disk) backup (usually using ignite backup) is important to maintain stable version of filesystem (vg00 or internal disk) which contain OS (HPUX) and other important files not stored on external storage.
hope it help you,
rgds,
Alfonsus Guritno

Similar Messages

ORA-01195: online backup of file 65 needs more recovery to be consistent

Hi,
I was doing a clone by taking the hot backup from prod to dev. The backup was good. And then I created the control file, Then I passed the command
recover database until cancel using backup controlfile;
It asked for the archived logs files. I supplied them until current time.
Then I canceled.
That's when I got this error
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01195: online backup of file 65 needs more recovery to be consistent
ORA-01110: data file 65: '/d10/oradata/dwdev/kt01.dbf'
ORA-01112: media recovery not started
What am I doing wrong? I have not yet passed the command "Alter database open resetlogs"
Should I do more logswitches in prod and pass those files to dev ? Or should I just put the kt tablespace in backup mode and copy the data files?

Which set of archivelogs did you copy over to apply ? All the archivelogs from the first ALTER TABLESPACE ... BEGIN BACKUP to the archivelogs subsequent to the last ALTER TABLESPACE ... END BACKUP ?
In the cloned datadabase, what messages do you see in the alert.log on having issued the RECOVER DATABASE command ? Does it complain about the datafiles being fuzzy ? Which archivelogs does it show as having been applied ?
Can you check the log sequence numbers for the duration of the Backup PLUS ArchiveLogs subsequent to the Backup ?

Do i need to open port for crash plan online backup service

do i need to open port for crash plan online backup service?
Thanks!

Possibly. I would start by checking out this CrashPlan support article. CrashPlan does require certain ports on both your computer's and network router's firewall to be open in order to communicate properly.

Online backup failing regularly... Need Help

Hi All,
Previously my online backup was success. But i dont know from one week my backup is failing regularly. Kindly help me regarding this.
Please find error log below.
-- Job startedStep 001 started (program RSDBAJOB, variant&0000000000096, user ID MANBASIS)Backup_Dev:Database Backup to DeviceBackup_Dev:started by CL_DB6_JOB_BACKUP_DEVICE on server MANPRODBackup_Dev:Parameter TESTMODE has not been setBackup_Dev:Parameter PARALLELISM has been set to " 0"Backup_Dev:Parameter RUNTIME has not been setBackup_Dev:Parameter BACKUP_MODE has been set to "ONLINE"Backup_Dev:Parameter PARTITION has not been setBackup_Dev:Parameter BACKUP_TYPE has been set to ""Backup_Dev:Parameter COMPRESS has been set to ""Backup_Dev:Parameter INCLUDE LOGS has been set to "INCLUDE LOGS"Backup_Dev:Parameter NUMBER_BUFFERS has been set to " 0"Backup_Dev:Parameter BUFFER_SIZE has been set to " 0"Backup_Dev:Parameter PARALLELISM has been set to " 0"Backup_Dev:Parameter UTIL_IMPACT_PRIORITY has not been setBackup_Dev:Parameter FILE_PATH has been set to "/dev/rmt/5mn"Backup_Dev:Command ' 'failedException CX_DB6_CON in program CL_DB6_JOB_BACKUP=============CP / CL_DB6_JOB_BACKUP=============CM002 at line ADBC error with rBackup_Dev:Exception CX_DBA_JOB in class CL_DB6_JOB_BACKUPBackup_Dev: Kernel Error ID:Backup_Dev:SYSID:Backup_Dev: SY-SUBRC: 1208Backup_Dev: SY-TABIX: 0Backup_Dev: Message: ADBC errorBackup_Dev: Database:Backup_Dev:caused byBackup_Dev:Exception CX_DB6_ADMINCMD in class CL_DB6_ADMIN_CMD method EXECUTE_CMBackup_Dev: D line 43Backup_Dev: Kernel Error ID:Backup_Dev: SYSID: MIPBackup_Dev: SY-SUBRC: 1208Backup_Dev: Message: ADBC errorBackup_Dev: Command: BACKUP DATABASE MIP ONLINE TO"/dev/rmt/5mn" INCLUDE LOGSBackup_Dev: Database:Backup_Dev:caused byBackup_Dev:Exception CX_SQL_EXCEPTION in class CL_SQL_STATEMENTBackup_Dev: Kernel Error ID:Backup_Dev: DB Error: YesBackup_Dev: SQL Code: 2025-Backup_Dev: SQL Message: SQL2025N An I/O error "3" occurredon media "/dev/rmtBackup_Dev: /5mn row=1Backup_Dev: DB Object Exists: NoBackup_Dev: Duplicated Key: NoBackup_Dev: Internal Error: 1Backup_Dev: Invalid Cursor: NoBackup_Dev: Unknown Connection: NoBackup_Dev: Connection Closed: NoException CX_DBA_JOB in class CL_DB6_JOB_BACKUP method line 40Backup_Dev:terminated with errorREASON=ADBC errorJob finished

But i dont know from one week my backup is failing regularly
How come its became an issue now? Does anybody monitoring the system and backups?
Isn't your Production system?
First check the points mentioned by Juan (It seems with wrong tape), use the right media and schedule a backup from BRTOOLS and let us know the status.
Contact your backup team for better understanding.
Regards,
Nick Loy

Online backup and RMAN

Can I do online backup / RMAN together?
I want to shedule both online back up and RMAN running on everyday..
Is there any known issue by doing this?

Hi,
Yes you can do but what is need to use two method for backup.
is there anything special reason.
regards
Taj

How does recovery work after an online backup

Hello,
While trying to conceptually understand how backup and recovery works, I came accross a question concerning hot (online) backup.
This is a conceptual question (I am trying to understand how things work), it is not a "how should I proceed/ what should I do step by step" question.
As far as I understand, an online backup of a tablespace can be performed by copying the OS files making up a tablespace while the database is up and being used (i.e. transactions are modifying data in the database). Before the copying of the OS files starts, the Oracle RDMS must be notified that an online backup is being taken via "ALTER...BEGIN BACKUP" (such that some additional information is written to the Redo Log, which may be required for subsequent recovery using the online backup). During recovery the Oracle RDBMS uses the copies of the OS files together with the online and archived redo logs in order to reconstruct all committed transactions and it further uses the UNDO tablespace to rollback open (uncommitted) transactions.
Thinking about this, it seems to me, that in order for this to work in all possible scenarios the undo information from the time the backup was taken may be required. Therefore backup of the UNDO tablespace should be taken as well (see the explanation for this assumption below). However browsing the internet (including the Oracle online documentation) I did not find any statements concerning the backup of the UNDO tablespace when an online backup is taken. Moreover I couldn't figure out when exactly such a backup of the UNDO tablespace must be done, to ensure that the database can be recovered in all scenarios.
I believe that undo information from the time the hot backup was taken may be required e.g. in the following scenario:
Assume we are taking a hot backup of a given tablespace, i.e. we are copying all OS files that make up this tablespace, while the database is potentially being used. Let D1 be one of the datafiles in our tablespace and let transaction T1 modify datafile D1. Let transaction T1 further be uncommitted while the copy of datafile D1 is being made and let (at least some of) the changes from T1 be included in the backup copy D1' of D1 (because DBWR has already written the modified blocks at the time they were being copied to the backup). Let transaction T1 be rolled back after the copy is completed. D1' will thus contain modifications from T1, while D1 will not.
Now some time later the datafile D1 is lost. When recovering D1 from the copy D1', the (archived) redo logs will be applied to D1'. Before that, transaction T1 should be rolled back in the copy D1', because modifications from T1 must not appear in the recovered version of the database.
I do however not understand, where the information to rollback transaction T1 exactly comes from. It may still be in the current UNDO tablespace. I do however assume that rollback information is not kept in the UNDO tablespace forever. I see three possible answers to this
(a) There are some requirements which I missed so far to backup the UNDO tablespace whenever a hot backup is made.
(b) Since the Oracle "RDBMS" has to be notified that an online backup is being done, it might store all relevant undo information (e.g. write it to the redo log) when the tablespace is put in backup mode.
(c) There are situations when recovery is not possible due to "missing old UNDO information".
Answer (b) seems the most plausible to me. I did however not find any confirmation of this and if (b) really is the answer, I would be interested to understand what information is stored where by the Oracle RDMBS and how it is used for recovery.
To summarize I have the following questions:
(I) Is there any requirement to backup the UNDO tablespace together with an online backup of a tablespace, and if so, where is this stated in the Oracle documentation?
(II) What mechanisms ensure that uncommitted transactions can be cleared from the online copy of a tablespace (potentially a long time after the copy was taken)?
(III) Do you know any links (Oracle documentation or other online resources) explaining these datails?
Thank you for any hints and answers
kind regards
Martin

Its a highly technical question and I can be completely wrong due to my very less knowledge but I would attempt to answer still. Hope I say something sensible so bear with me.
As far as I understand, an online backup of a tablespace can be performed by copying the OS files making up a tablespace while the database is up and being used (i.e. transactions are modifying data in the database).Correct. But it would depend on the tool you are going to use to do so.Using o/s level commands like CP and all would require you to manually copy the files to the backup location. Using RMAN, it would be lot easier and RMAN would take care of everything.
Before the copying of the OS files starts, the Oracle RDMS must be notified that an online backup is being taken via "ALTER...BEGIN BACKUP" (such that some additional information is written to the Redo Log, which may be required for subsequent recovery using the online backup). Again, this is a requirement only in the case of user-managed backup . In that case, because of the fractured block issue , its important that the corresponding older information/image of the buffer is also copied in the redo stream and that's done when the begin backup command is used. Using RMAN, this is not needed as RMAN can read the consistent image which it would store in the backup piece, exactly in the same way in which select request is fulfilled by oracle for a dirty buffer which is yet to be made consistent.
During recovery the Oracle RDBMS uses the copies of the OS files together with the online and archived redo logs in order to reconstruct all committed transactions and it further uses the UNDO tablespace to rollback open (uncommitted) transactions.Correct!
Thinking about this, it seems to me, that in order for this to work in all possible scenarios the undo information from the time the backup was >taken may be required. Therefore backup of the UNDO tablespace should be taken as well (see the explanation for this assumption below). >However browsing the internet (including the Oracle online documentation) I did not find any statements concerning the backup of the UNDO >tablespace when an online backup is taken. Moreover I couldn't figure out when exactly such a backup of the UNDO tablespace must be done, to >ensure that the database can be recovered in all scenarios.The reason that its not a must to do so is that if the transaction is yet active, there is no way that Oracle would overwrite the Undo information of it, even if you may come after 100 years, it would be there. The Undo segment would mark those blocks as active undo blockswhich contains the information of that transaction whose status within the transacton table of that undo segment is still marked as active. So its there all the time in the undo tablespace. Now, for an instance, let's assume that the undo is not there as well( it would be but let's assume), the changes made to the undo segment's blocks are also recored in the redo as its just a change happening to any other segment like EMP,DEPT except with the difference that its not done by you but by oracle. So using that information, in the future , if there would be a need to replay those changes, necessary information to do so can be brought up from the redo blocks stored in the redo/archive logs. Yes, if there would be pending transactions that would require Undo information to get them rolled back and you have lost Undo tablespace and have no backup of it , you wont be able to bring back the database as it would be inconsistent and oracle would not let you to do it. In that case, you may require to use hacks to get it up and that would be really tricky situation.
(I) Is there any requirement to backup the UNDO tablespace together with an online backup of a tablespace, and if so, where is this stated in the Oracle documentation?As I said above, it must be there if you are anticipating loss of Undo tablespace. If you have lost it, you would need a backup and all the archive logs and redo logs to recover and get it back to the point where the current database is . Rest, oracle would take care as it would reapply the redo contents of the undo segments over the undo segment and get it consitent.
(II) What mechanisms ensure that uncommitted transactions can be cleared from the online copy of a tablespace (potentially a long time after the copy was taken)?As I said , pending transaction's undo is never overwritten by Oracle. Its always kept and marked as active undo . Only a transaction end would make it elgible to get overwritten and that too won't happen immediately(undo_retention would kick in) .
(III) Do you know any links (Oracle documentation or other online resources) explaining these datails?I have to see if its there some where step by step mentioned and I shall update the reply once I shall find the link. Hoep someone else in the meantime finds it .
HTH
Aman....

Open resetlogs is not working when creating clone db with online backup

Hi All,
I am trying to create a clone database using hot backup of a database .
STEPS THAT I FOLLOWED
LET ----- >CURRENT_DB NAME=DEV
CLONE DATABASE NAME=DEVCLONE
steps PERFORMED FORM DEV DB
- put the database in backup mode using 'alter database begin backup'
- copy all the data files to a different folder
- during copy i have performed some operations on the DB (creating users, tables, dmls etc...)
- in between copying i also performed log switch
- after completion of copy , "alter database end backup"
- created a backup control file in a human readable format (alter database backup controlfile to trace as ........)
steps performed for clone DB side ((DEVCLONE)
- created a parameter file for the database .
- modified the backup control file so that it will point to the location of copied destination of datafiles
- set the ORACLE_SID
- then 'sqlplus / as sysdba
- starup nomount
- run the modified control file ( created a control file for the clone database)
- recover the database using "recover database using backup controlfile"
I have provided the archive files that it was asking for (archive logs that has been generated in DEV DB)
then i canceled the recovery by typing "cancel"
- recover database using backup controlfile until cancel;
then typed "cancel"
- then try to open the database with open resetlogs but it showed below error
alter database open resetlogs
ERROR at line 1:
ORA-01195: online backup of file 1 needs more recovery to be consistent
ORA-01110: data file 1: 'D:\DATA_GUARD\DEVHOT\SYSTEM01.DBF'
please help me on this ......
Thanks

Thanks , now i am able to open the DB in open reset logs mode .
Previously , when i had not taken the archive log after "alter database end backup" , i was not able to open the db with open resetlogs because the
fuzzy status of all the datafile headers were YES .
But after taking the archive log that got generated after "alter database end backup" and applying it on the clone db(Created with HOT backup ) the datafile_header status got changed from YES to NO .
So for that i am able to open the clone db with open resetlogs .
Can you please help me with a small description why this is happening ?
Thanks.......

Database open fails after online backup recovery

Hi Friends
We are trying to set up an additional server using the online backup of our DEV server. We have been following SAP Note 549828 for the same. Having restored the online backup, the open database failed.
To resolve the same, in accordance to SAP Note 549828, we created a backup control file with success using the command
create controlfile reuse set database DEV resetlogs noarchivelog
However on issuance of the command
RECOVER DATABASE USING BACKUP CONTROLFILE UNTIL CANCEL
we run into an error as to
ORA-00279: change 794638222 generated at 10/25/2007 12:43:20 needed for thread 1
ORA-00289: suggestion : /oracle/DEV/oraarch/DEVarch1_9766.dbf
ORA-00280: change 794638222 for thread 1 is in sequence #9766
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00308: cannot open archived log '/oracle/DEV/oraarch/DEVarch1_9766.dbf'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/oracle/DEV/sapdata1/system_1/system.data1'
We even manually copied the file system.data1 from the source to the target server but to no avail.
Also the SQL command
SELECT FILE#, CHANGE# FROM V$RECOVER_FILE
displays a different change# for system.data1 while it is showing same number for all other datafiles.
Please advice at the earliest as we are struck. Points awaiting their master.
Regards
Lokesh Gupta

Some inputs addition to Erics comments
The problem is you dont have archives ie Offline redo logfiles in correct location.
/oracle/DEV/oraarch/DEVarch1_9766.dbf Here DEVarch1_9766 is archive file which is misssing from location /oracle/DEV/oraarch. To recover DB you need Archives generated during hot backup.
Generally these steps willl give you desired result.
select * from v$logfile;
We normally switch the log files to the number of log groups that exist
alter system switch logfile;
create a Backup directory to hold our hot back datafiles and Archives
When the backup is complete check the backup location to see if all the files are available. We could now either FTP the same to the other system or copy over these files to another location in case of cloning on the same system.
Copy over all the files to their respective filesystems and directories and then edit the file that was created using the backup controlfile to trace. Copy that file to the remote system and edit it accordingly.
check that all the files are in the right location and edit that information in the control file
Once the controlfile is run successfully and you get the statement processed, we can start applying the archive logs that we have moved to the archive log destination directory as per the init<sid>.ora file.
do a recover of the database to its consistent state
recover database using backup controlfile until cancel;
The create control file command only changes the structure of the database and the SID name, the header of the datafiles still hold all the required information. The above command would ask you to input the archive log file names one by one to do recovery or you could choose the AUTO option. Once the recovery process is complete, open the database with the resetlogs option
Regards
Vinod

Getting error while running script for online backup

Hi,
I am running a script for online backup but ended up with an the below error.
*ERROR* [Backup Worker Thread] com.day.crx.core.backup.Backup Failed to create temporary directory
Please help out in resolving this.
Thanks in Advnace.
Maheswar

Hi mahesh,
If you are using backup feature from crx console, I mean http://localhost:4502/crx/config/backup.jsp I can say that we had also some problems with this functionalities.
First off all what you need to check are the permissions, because when you check a source code there is line which creates a File object using a path specified by you to make a backup of repository.
File targetDir = new File(req.getParameter("targetDir", listDir.getParentFile().getAbsolutePath()));
You need to have sure that the proper read write access has been granted for this path.
Another issue is that maybe there was already prepared some hotfix if you are using CQ5.4. Please refer to the following link:
http://dev.day.com/content/kb/home/Crx/CrxSystemAdministration/CRXOnlineBackup.html
and also to this one:
http://dev.day.com/content/docs/en/crx/current/release_notes/overview.html which contains a hotfix number #34797 which was applied to backup.jsp file.
Regards,
kasq

Online Backup of supported Linux VM on Hyper-V 2012 R2 / SC DPM 2012 R2

Hi,
I'm trying to set up a lab environment:
Win 2012 R2 with Hyper-V
running 2 Linux Machines:
Linux2 - CentOS 6.4 with manually installed Linux Integration services 3.4
Linux3 - CentOS 6.4 without LIS (should be already included in CentOS)
Another machine running Win 2012 R2 Server with SC DPM 2012 R2
but both VMs show as "Offline" when trying to back them up via DPM. Tried local Windows Server Backup with the same result.
I am able to backup the VMs "offline" (pausing the VM, taking snapshot, resume VM) but according to MS, SC DPM 2012 R2 should be able to do Online backups for supported Linux VMs (http://blogs.technet.com/b/virtualization/archive/2013/07/24/enabling-linux-support-on-windows-server-2012-r2-hyper-v.aspx)
The only things in the EventLog are these:
A storage device in 'Linux3' loaded but has a different version from the server. Server version 6.0 Client version 4.2 (Virtual machine ID 4F5CDDD8-B855-41CF-83B2-772C1B99090D). The device will work, but this is an unsupported configuration.
This means that technical support will not be provided until this problem is resolved. To fix this problem, upgrade the integration services. To upgrade, connect to the virtual machine and select Insert Integration Services Setup Disk from the Action menu.
Any Ideas ?
Thanks

Hi,
That list would need to come from the Windows hyper-v group, they are responsible with adding the feature to the integration components for various Linux OSes. DPM just backs up whatever the hyper-V writer presents to us, if the guest supports
online, we back it up online, if not hyper-V saves the guest before the VSS snapshot is taken and DPM takes the backup from the saved state.
NEW NOTE ADDED 1-29-14: Windows group just released “Linux Integration Services Version 3.5 for Hyper-V”. The
document mentions that some versions of Red Hat and CentOS are now
supported to do online backup.
Live virtual machine backup support
======================
RHEL/CentOS 6.0-6.3
RHEL/CentOS 5.7-5.8
RHEL/CentOS 5.5-5.6
ADDTL NOTES: If there are open file handles during a live virtual machine backup operation, the backed-up virtual hard disks (VHDs) might have to undergo a file system consistency check (fsck) when restored.
Live backup operations can fail silently if the virtual machine has an attached iSCSI device or a physical disk that is directly attached to a virtual machine (“pass-through disk”).
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT] This
posting is provided "AS IS" with no warranties, and confers no rights.

What is the best online backup for OS 10.5.8? And if I Reinstall OS will I have problems?

My old Mac has had the flashing question mark file on a blue screen. I waited a couple days, turned it back on and it worked. However, in between that time I went and bought a new Macbook Air. I am relieved to have all of my pics and docs back. I need a good online backup. I downloaded BackBlaze Backup but it is taking forever and I am not sure if it's the best choice.
My plan is to backup all of my files and then wipe my computer clean with the install disks and give my computer to my little sister. So, my question is two fold; which is best online backup and will I have any issues wiping clean the computer and doing a reinstall? For example, will all the updates still be available? What is the best thing for me to do?
Thank you : )

Just understand it gets pretty expensive after you exceed the free space. 2-5 GBs isn't much space.
Basic Backup
For some people Time Machine will be more than adequate. Time Machine is part of OS X. There are two components:
1. A Time Machine preferences panel as part of System Preferences;
2. A Time Machine application located in the Applications folder. It is
     used to manage backups and to restore backups. Time Machine
     requires a backup drive that is at least twice the capacity of the
     drive being backed up.
3. Time Machine requires a backup drive that is at least double the
     capacity of the drive(s) it backs up.
Alternatively, get an external drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
1. Carbon Copy Cloner
2. Get Backup
3. Deja Vu
4. SuperDuper!
5. Synk Pro
6. Tri-Backup
Visit The XLab FAQs and read the FAQ on backup and restore. Also read How to Back Up and Restore Your Files. For help with using Time Machine visit Pondini's Time Machine FAQ for help with all things Time Machine.
Although you can buy a complete external drive system, you can also put one together if you are so inclined. It's relatively easy and only requires a Phillips head screwdriver (typically.) You can purchase hard drives separately. This gives you an opportunity to shop for the best prices on a hard drive of your choice. Reliable brands include Seagate, Hitachi, Western Digital, Toshiba, and Fujitsu. You can find reviews and benchmarks on many drives at Storage Review.
Enclosures for FireWire and USB are readily available. You can find only FireWire enclosures, only USB enclosures, and enclosures that feature multiple ports. I would stress getting enclosures that use the Oxford chipsets especially for Firewire drives (911, 921, 922, for example.) You can find enclosures at places such as;
1. Cool Drives
2. OWC
3. WiebeTech
4. Firewire Direct
5. California Drives
6. NewEgg
All you need do is remove a case cover, mount the hard drive in the enclosure and connect the cables, then re-attach the case cover. Usually the only tool required is a small or medium Phillips screwdriver.

Less redo generates at the time of online backup using RMAN

Hi,
can someone eleborate that why less redo generates at the time of RMAN online backup in comparison of manual hotbackup.
Thanks

A manual hot backup (aka "OS backup" or "scripted backup") cannot handle fractured blocks. This happens when a backup command is copying out blocks from a datafile at the same time as DBWR is updating blocks. The Oracle Block Size (8KB) is generally a multiple of the OS Block size (512Bytes to 4KB or 8KB, depending on the filesystem / raw device and how the OS command copies blocks out). It is possible for DBWR to write 8KB and the OS backup utility to be concurrently reading the same Oracle block as, say, two different 4KB reads. The first half of the Oracle block may be read by one OS call and the second half by another OS call -- the two halves would be inconsistent with each other if Oracle were writing the database block at the same time.
(Therefore a restore of such a backup would give you an inconsistent -- i.e. fractured -- block, which would be logically corrupt).
In order to handle such issues, after a BEGING BACKUP is issued, for every first change to a database block, the whole block is written to the redo stream, not just the change vectors. (If the same database block is subsequently modified while in BACKUP mode, it is only the change vectors that have to be written to the redo stream). Once the END BACKUP is issued, the redo stream does not need to capture whole database blocks.
If such a backup is restored, it still has fractured blocks. However, when applying the ArchiveLogs generated during the Backup, each such fractured block is "automagically repaired" because a whole image is restored from the ArchiveLog. (Subsequent changes are replayed as changes through the change vectors).
Hemant K Chitale
http://hemantoracledba.blogspot.com

Online Backups Rman

HI,
I have setup an oracle database running one of our inhouse applications on a Linux Red Hat 4 Enterprise OS. Project go live
is a few days away and I don't have time to teach myself Oracle backups at this stage. I was hoping a few experts could
help me out with the following.
1. What configuration settings do I make to Oracle database and RMAN to prepare for online backups? How do I check
that the settings have already been done?
2. what commands do I then run to trigger off a online backup and what script type do you use so it can be scheduled?
3. How do you schedule the online backup?
My plan its to do an online backup to a folder on another partiton and then use rsync to sync the backup over to another
server which has tape backup.
I also though of running a script to shutdown the databse, then use rsync to copy the databse to a new location and then
startup the database again. Anyone ever use this backup type?
Many Thanks!
Raikal.

Hi 581156,
You can use RMAN to do your online backups, please can you tell us your RDBMS version,OS and if the DB is on archive mode or not? I need this to send you the right links to help you on this process.
Please take a look on this link:
http://www.orafaq.com/wiki/Oracle_database_Backup_and_Recovery_FAQ
Also if you need more information, please refer to:
http://tahiti.oracle.com/
Cheers,
Francisco Munoz Alvarez

I formatted my harddrive, did not backup my mozilla (on accident), but I was wondering if there might be an online backup with your database?

I was hoping there might be some information that's sent to an online database, because I had literally forgot to backup that specific file, and now I'm hoping to find out if there is anyway to recovery what I lost in the formatting of my harddrive.

This is rather hard to follow, and figuring out just what went wrong and when won't really help much, as all you want to do now is be sure you've got everything.
If I understand it correctly, you now have all the right data, much copied via the Finder. If so, check for permissions problems that can occur if you do this, especially in a multi-user environment. If there are many problems, you might do better by using the normal TM interface to select and restore the files & folders.
If all you're now missing are separate Applications folders for each user, use the TM interface to restore them, also.
Note that you probably won't see the backups you want via +Enter Time Machine.+ TM keeps the backups for each Mac separate, and normally only shows the ones for the Mac it's running on, even if there are other Macs' backups on its disk/partition.
To see these "other" backups, you need the (badly named) +Browse Other Time Machine Disks+ option. It's available by holding down the Option key while selecting the TM icon in your Menubar, or by control-clicking (right-clicking) the TM icon in your Dock.
You'll see a selection screen showing all the disks/partitions that have TM backups on them. Select the one you want, and you'll be taken to the normal TM "Star Wars" interface, where you should see all the backups on that disk/partition. You can restore from such backups to an alternate location, by selecting the desired items, clicking the "gear" icon in the TM Finder window's toolbar, and selecting the +Restore <item> to ...+ option.
Also note that when you start doing TM backups from the new Mac, the old ones will be "stranded" -- TM won't delete the oldest ones when it needs room for backups of your new Mac. It will delete the oldest backups from the NEW Mac instead. So your best bet may be, once you're sure you've got everything, to erase your TM disk with Disk Utility and let TM start fresh with the new Mac.

No Online backups due to datafiles offline than I canu0092t recover. How...?

Hi gurus!!!
I got into a problem with some datafiles.
We have MySAP in a BD oracle 9.2.0.6
I used Oracle Entreprise Manager Console to generate two datafiles in the tablespace PSAPPRDUSR,
but I generated them in another tablesapce (PSAPPRD) with a name of file,
size and location very different from those that there uses the tablespace PSAPPRD.
So... I put them offline later to erase them later!!!
The datafiles contains no data.
Later, in the night backup:
 BR0334W Status of database file /oracle/PRD/sapdata4/prdusr_2/prdusr.data2 is RECOVER
 BR0334W Status of database file /oracle/PRD/sapdata4/prdusr_2/prdusr.data2a is RECOVER
 BR0301E SQL error -1128 at location BrTspAlter-3
 ORA-01128: cannot start online backup - file 31 is offline
 ORA-01110: data file 31: '/oracle/PRD/sapdata4/prdusr_2/prdusr.data2'
 BR0280I BRBACKUP time stamp: 2007-04-20 03.01.21
 BR0316E 'Alter tablespace PSAPPRD begin backup' failed
 BR0056I End of database backup: bdvbtndh.ant 2007-04-20 03.01.21

And now... I neither can erase them nor can put online again.
To erase them I used:
SQL> ALTER DATABASE DATAFILE '/oracle/PRD/sapdata4/prdusr_2/prdusr.data2' OFFLINE DROP;
Database altered.
SQL> commit;
But they continue there, do not resign.
To put them online:
SQL> alter database recover datafile '/oracle/PRD/sapdata4/prdusr_2/prdusr.data2';
alter database recover datafile '/oracle/PRD/sapdata4/prdusr_2/prdusr.data2'
ERROR at line 1:
ORA-00279: change 31203204 generated at 04/19/2007 19:30:11 needed for thread 1
ORA-00289: suggestion : /oracle/PRD/oraarch/PRDarch1_2574.dbf
ORA-00280: change 31203204 for thread 1 is in sequence #2574
SQL>
But we have continued working and I don't want to lose any data.
HEEEELP!!!!
What I can do to recover the datafiles and to continue with my daily Online backups?
The BD is in production and I do not have long time to fix it, only a few hours on Saturdays night.

Hi,
alter database datafile offline drop;
This command is not meant to drop a datafile. It is meant to offline the datafile with the intention of dropping the tablespace.
For a tablespace comprising multiple datafiles you can only drop a datafile by dropping the entire tablespace, this will work even you have one datafile.
If you have 10gr2, it's finally possible to drop a datafile as long as
it's not the only datafile within the tablespace, and
the tablespace is only and in read-write status.
So since you are on 9i your situation in summary:
If you have more than one datafile in the tablespace and you wish to keep the objects that reside in the other datafile(s) which are part of this tablespace, then you must export all the objects inside the tablespace.
1. Gather information on the current datafiles within the tablespace by running some query to remember the t/s, segment, and datafile info.
2. Export all the objects that you wish to keep.
3. Once the export is done, issue the DROP TABLESPACE <tablespace name> INCLUDING CONTENTS.
4. Delete the datafiles belonging to this tablespace using the operating system.
5. Recreate the tablespace with the datafile(s) desired, then import the objects into that tablespace.
Hope this helps and good luck,
George

Online Backup is needed everyday??

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