How to recover data from corrupt redo

Hi All,
I have one qurey regarding redo file. My database is in Noarchive mode and all redo files size is 1G, there are 3 groups and all group having 1 member each.
Now in case my all redo corrupt/dropped then can I recover my data from corrupt redo? does it mean that I can have loss of 3G data? is it?
Please update me.
Thanks...

Yes, it's true that a lost or corrupted redo log can put your entire database at risk. Please read Re: How can I get around recovering a data file that doesn't need to be?? for a recent thread on the same issue.
To summarize the options you have, in roughly descending order of desirability:
1. If you have one, restore the database from a recent cold backup.
2. If you have a recent export, rebuild your database and import your data from the export.
3. If you have no sort of backup whatsoever, attempt to open your database without the redo logs, using an undocumented startup parameter. This option is risky. It may not work at all and it may further damage your database. It's best to do this under the supervision of Oracle Support, if you have a valid support contract. Don't try this without first taking a cold backup of your database. If it does work, you must immediately take an export and then proceed to option 2 (rebuild your database and import data from export).
4. Buy a license for DUDE, or some similar product, which may allow you to recover your data from the remaining data files. This option will probably be very expensive.
5. Accept the loss of your entire database.

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How to recover data from bad hard drive

Once a hard drive goes bad (cannot get into the computer), is there any hope of recovering any data from it? If so, how?

Do you mean the hard drive is mechanically broken for sure? It's not a data corruption issue that is causing a problem with starting up the Mac, but maybe not be a bad mechanism?
If the drive is definitely broken, there are businesses that specialize in recovering data from bad hard drives. For example
http://www.drivesaversdatarecovery.com/ (I always saw their booth at MacWorld Expos...)
The cost of such services is usually high.
cannot get into the computer
So that probably means the hard drive in question is the internal drive? If you don't know for sure that the hard drive is physically broken, you can try starting up using your Mac OS X installation disc. Insert disc in optical drive and start up with the C key held down. When you get to Installer's screen, go up to the menu bar and run Disk Utility from the Utilities menu. Does the internal drive appear in the Disk Utility sidebar?
Alternately, if you have another Mac (that has FireWire), you can try starting the Mac with the problem in FireWire Target Disk Mode,
http://support.apple.com/kb/HT1661
Connect the "target" Mac to the other Mac (running normally) using a FireWire cable. Run Disk Utility on that Mac. Does the hard drive of the Mac in FireWire Target Disk Mode appear in the sidebar?
If you can get the internal drive to appear in Disk Utility, you may be able to run Repair Disk on the First Aid tab. There are also third-party utilities, such as TechTool Pro (Micromat), Drive Genius (Prosoft), and Disk Warrior (Alsoft), that may be able to fix (or at least recover data from) the hard drive.

How to recover data from a hard drive with bad blocks?

An external hard drive, 4TB Iomega...connected via eSATA cable...had a power outage and the drive won't be read by OSX now. (Yes, it was on a surge protector and no I did not have a backup. I was actually preparing for the process of creating a backup when the power went out!) Anyway, I have tried using Data Rescue 3 and DiskDrill to try and recover data from the drive. I can recover the first 1/3 of the drive, but it ejects when either app tries to access the bad block. Can anyone tell me how/what software to use to recover the data? I know there are programs that will avoid the bad block but I've only found them for Windows. Are there any that will do such a thing in Lion? Any help will be appreciated...and no, I can not afford a data recovery service. Trying to do this on my own.

Basics of File Recovery
If you stop using the drive it's possible to recover deleted files that have not been overwritten by using recovery software such as Data Rescue II, File Salvage or TechTool Pro. Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive. Two free alternatives are Disk Drill and TestDisk. Look for them and demos at MacUpdate or CNET Downloads.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
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How To Recover Data From A Corrupt Mdf File?

Hi All,
By mistake i delete database from sql server. Due to which the the mdf and ldf file of the datbase are removed from my system. Then i used file recover utility and retrived my mdf and ldf files.But now i am not able to attach those files into databse. These
mdf and ldf files has been corrupted. Now how can i recover my data from those mdf and ldf files.Please answer me if you have any solution on this problem.

Seems to be duplicate thread -
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/a1ace001-cd8f-43ff-85af-88b6011f4d02/myfilenamemdf-is-not-a-primary-database-file?forum=sqldatabasemirroring
There are very less options . You can contact some third party companies who does these kind of corruption stuffs, but not sure whether it will be successfull.
You can also try this but not sure how far it will work out.
Create a new database with the same name, physical file name etc.
Offline the new database.
Replace database files with the copy of .mdf and .ldf files that you already have.
Try to bring the database online.
If it goes into suspect, put it into emergency mode and run DBCC Checkdb. and try.
This is explained in the blog -
http://www.sqlskills.com/blogs/paul/creating-detaching-re-attaching-and-fixing-a-suspect-database/
Check from this portion in the blog - "So, never detach a suspect database."
Good Luck !!
Regards, Ashwin Menon My Blog - http:\\sqllearnings.com

How to recover data from failed drive that's part of mirrored raid

Hi Guys,
hope to get help from someone knowledgeable out there. I have a macpro and recently experienced a failed drive. I set up that failed drive as part of a mirrored raid, this set is not my primary drive and so my computer is stilling up and running but now am wondering how I access the data from the mirrored drive. Should the mirrored drive automatically mount on my desktop whereby I would be able to access the files? This is my first drive failure and I was under the impression having a mirror would duplicate my data and allow me to access it in situations like this. I'm a bit of novice in this area and not sure if the data is truly on the "mirror" or if there are things I need to do.
I launched disk utility and was able to see the mirrored drive and I selected "mount" drive but it would not mount; I then selected "verify" and got "unrecognizeable filesystem" Is this normal? Am I suppose do something to get access to the mirrored drive? Do I install a new drive in place of the failed drive and expect the raid to rebuild automatically whereby I then see the data?
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Even with a mirror, you still need a backup.
Along with Disk Utility, you still need 3rd party (TechTool Pro 5, Disk Warrior 4.1.1+).
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Hello Sir/Madam,
Previously I was using Microsoft Wndows XP Professional,with version: 5.1.2600 Service Pack 3 Build 2600.
I took .bkf files by using the Backup utility (i.e. Start -> All Programs -> Accessories -> System Tools and then click Backup)
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Now I have the .bfk files in my external hard disk and I want to recover my data from that .bfk files made from xp-sp3 pc to windows 7.
Plz help me.....
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Yes, you need to first install Removable Storage Management software before installing NT-Backup.exe in Windows 7. To know more about restoring backup file, you can read this post: http://belanalavade.blog.com/2014/04/15/how-to-repair-damaged-bkf-file/
Berdooook
No. You do not need to install Removable Storage Management in Windows 7 to read NT backups!
You go to http://support.microsoft.com/kb/974674 and download the package for Windows 7 that Microsoft has published specifically for this!
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. ”

How to recover date from i phone 4

Hi,
I have an iphone 4 and unfortunately the phone got wet (waves on the beach). I understand there is a problem with the board and maybe also with the battery.
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And - more important - how can I retrieve or at least, is there a possibility to retrieve some data I had on my phone.
Any suggestion how to recover the data is more welcome. Maybe there is a programme ?
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"I would like to know if I am eligble for an out of warranty replacement. Do I have to buy the same mobile or is it possible to upgrade to an i phone 5."
You would get the exact same model
"And - more important - how can I retrieve or at least, is there a possibility to retrieve some data I had on my phone."
No

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Something like this would work. Pull out your hard drive and put it in the enclosure. Hook it up to a working computer and you should be able to see all your folders and files.
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i was using my Apple Ipod as a storage device to keep data back up of my personal file. Unfortunately data in this device is corrupted and i dont know how to retrive it now.
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http://www.amacsoft.com/ipod-data-recovery.html
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N86 8MP : How to recover Photos from corrupted E: ...

Hi,
I'm using a N86 8MP which is less than 5 months old. Recently, I have lost all my music files and all the crucial photo images which I have taken between Jan till now and I have not done a backup yet. Somehow this occurs after I have switched the Singapore SIM Card to a China Prepaid Card. Could it be the cause of data losses? Also, not sure if the missing data has anything to do with the corrupted E:Mass Memory which I have just discovered.. Any ideas/advise?
And, may I know, how can I recover all the Photos from the corrupted E:Mass Memory?
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I met this kind of problem before with the corrupted SD card on my Samsung phone but it came out I got nothing from the card as the corrupted card can not be recognised by the computer when connected. So I hope you are lucky. (your card can be detected,)
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http://www.cgsecurity.org/wiki/TestDisk_Download (Windows, freeware)
http://www.apple.com/downloads/macosx/system_disk_utilities/photorecovery.html (for Mac OS X shareware)
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http://www.wondershare.com/pro/photo-recovery.html
You can try the demo to see what you can recover before buying.
Remember - Do NOT try & write anything back to the card until you can recover your pictures and music to your PC safely! Merry Christmas

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OK- here is the pinch:
I have a Western Digital My Book 500GB Studio Edition which, though visible in Disk Utility, fails to mount, even when I try to do so via Disk Utility. I have tried all the usual- unplugged, repowered-up, changed the order of Mac to external drive power-up/plug in etc etc. It will not mount, end of.
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Could that ^ be something worth pursuing? I cannot ask on the thread as it is from 2006 and, obviously, archived.
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Did you try using a powered USB hub?
Mac's now cut off port powered drives if they draw too much current.
The external drive is a powered SATA, currently residing in a powered SATA to USB housing, no extensions. No, the drive is actually just not supported anymore and was not mountable before.
Also use the Mac version of Data Rescue for file recovery, it knows the Mac file formats better than PC file format recovery.
I cannot recover anything with a Mac because the Mac will not read it. It is not supported due to something my friend did with his PC:
This is only since he had a go at recovery. Before then it was supported and appeared fine- just not mountable.
Obviously what happened is it took the MPEG portions of the Mac files as it understood that and discarded the rest.
Yes, I gathered that and explained as much to him. It discarded the entire 120GB FCPro project file I kind of would like to recover.
Not sure what now...
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How to recover data from the hard drive?

I've always heard that data is never really gone from the hard drive even after you delete it. How do I recover that data? My problem is some photos (my honeymoon photos) have been deleted from my computer and they have also been deleted from the recycle bin. I sure would like to recover them.

First stop using your system, then get a copy of a program that will recover files like Data Rescue 3. If you have a time machine backup you may be able to restore them.

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You can try these.
Data Recovery Programs
Data Recovery – Best
Data Recovery – Disk Drill
Data Recovery – Data Rescue
Data Recovery – File Salvage
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(105479)

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General File Recovery
If you stop using the drive it's possible to recover deleted files that have not been overwritten by using recovery software such as MAC Data Recovery, Data Rescue II, File Salvage or TechTool Pro. Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive. Two free alternatives are Disk Drill and TestDisk. Look for them and demos at MacUpdate or CNET Downloads. Recovery software usually provide trial versions that enable you to determine if the software would help before actually paying for it. Beyond this or if the drive has completely failed, then you would need to send the drive to a recovery service which is very expensive.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
Also visit The XLab FAQs and read the FAQ on Data Recovery.

How to recover data from corrupt redo

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