Corrupted Database? What to do when Database crashes?Murtaza J.
Today, Database servers have a major role in daily business deals and accidental data loss can cause loss of productivity. The server can crash due to programming errors, RDBMS software failures, unexpected power surges or hardware failures.
In such cases, if your database is corrupted then here are few tips to recover it. Follow the steps below to get the best out of the data recovery in such situations.
Unmount the Device.
If you un-mount the database file on a hybrid system then it will allow you to stop further damage to your media. If you have a server with single-user or maybe you cannot unmount the system then keep the system turned off until you analyze and find the solution.
Having a data backup is always a good thing. If you had taken a system backup then this is the best time to brag about it. Check the files that will be replaced with the backup and the chances of the re-creation of such. To avoid Data loss cause of Data corruption we advise making at least 3 data copies of your media in a physical drive.
Analyzing and Determining the Symptoms.
One can never determine the exact reason for data loss, but you can determine by checking the warning messages of hardware failure.
- If your hardware makes weird noises or just won’t mount then turn off the device instantly as it might be a failing hard drive inside.
- If you get messages such as BAD SECTOR or Media Failure then also it can be a major concern for single storage devices.
- Utilize system tools to analyze the health or your RAID arrays and other drives. If you don’t feel any noticeable failures or any physical hardware failures, you should run tests on a scheduled basis. If you don’t have access to the main controller then stop performing any further file or sector repairs and contact a data recovery specialist immediately.
Make a copy before all.
Usually, databases have an inbuilt tool to handle overwritten data. But if your device has hardware failure then it can work in an opposite way of damaging your files even more by overwriting on it.
Before you start any further repairs or running any utility make a copy of your damaged media to an external device. You can try imaging the whole drive to another drive and run tests on the imaged one to avoid any data loss. Never ever run CHKDSK or any other related commands or tools. Using such tools and commands can lead to furthermore damage and permanent data loss.
Contact an Expert Data Recovery Provider.
Avoid using all 3rd party tools on the internet promising you full data recovery. If the inbuilt utility inside your database cannot recover the data then there is a very thin chance of getting your data back by such tools. Shut down the device immediately and contact a professional data recovery company. Before choosing such data recovery expert make sure that they have RAID simulation tools for RAID Data recovery, certified clean room and knowledge and experience of MS Access, MySQL, SQL, Oracle and much more.