Data Recovery ToolsOn most conditions, data recovery tools are employed only when something really goes wrong. Of course, under normal conditions, nothing goes wrong and people never realize the importance of data recovery tools. When something does go wrong then if appropriate measures have been taken data recovery could become easier. There are different types of data recovery mechanisms normally suggested. Some of them are proactive and the others are reactive. Proactive methods adopt such processes as data backups and data safe storages, mirror sites etc., to take care of any untoward data loss. This is the standard process for data recovery and the data recovery tools employed for this purpose is just to restore the data that has already been saved in the back up devices. On other conditions, data loss occurs at different levels. Most of the database systems come with data recovery tools. They help in uncommitted data loss and its retrieval. Such data recovery tools would help the people when, say, a power failure occurs during a save operation or before a commit occurs. Or when a commit has occurred and the child table has not got committed. Many times such partial commits occur. Some of the data recovery tools try to maintain'inertia' in the system. This will work in such a way that even if the power failure occurs, the task at hand is completed before the system comes to a halt. This is made possible by stored electricity in its power system. There are other data recovery tools that work after the system has closed and is restarted may be after the data loss has occurred. During this phase, it could cause multiple losses to the system and the data recovery tools need to work in tandem with the operating system and the database system to retrieve the lost data. There are also cases where database integrity is all that is lost and a recheck of the database integrity will bring about the required data back. Some of the data recovery tools in trying to create integrity might go about removing those records that are not contributing to the record thereby causing a roll back to the earlier situation. In this condition, the user might have to re-enter date but the database reaches a stable state without causing any malafide operation. Some of the major issues, however, could be that the entire file system could be under jeopardy. In which condition, there could be cases where the entire hard disk is to be restored back using the data recovery tools. These kind of tools will have the capability to bring back the file system directory tables so that every data in the hard disk is reachable. Only under one condition, such data recovery tools might not be helpful is when the hard disk head crash has occurred and all the data in the hard disk is absolutely not reachable. |