How can you efficiently recover all your data when your desktop, laptop or tablet crashes or loses some of the data? In addition, databases, which are collections of interrelated data, are rampant in use by all organizations involved such as hospitals, banks, travel agencies, hotels, shopping complexes and so on! So what do you do when these databases with huge collections of important data are suddenly sabotaged? This article takes a look at these aspects and provides tips on how to recover data. So why don’t you read on?
First of all, let’s talk about your laptop, desktop or tablet that you use every day. The best ways to restore all data on these machines when they crash without warning or for example lose some of the data due to an error that occurs is by backing up all your data on flash drives with a large number of GBs storage in varieties. Figure out and then decide how much GB of data from your machine and / or along with storage from other sources you need then buy that flash drive within that capacity or more and keep a backup of all your important data. You should preferably update your backup weekly, if not daily. This allows you to restore all your data on your computer using the backups.
Let’s say you have a huge collection of audio, photos, files in different formats and they are constantly growing on your computer and you want to backup all your data from day 1 to today and you cannot keep all your data intact on your computer. In fact, you are dealing with terabytes (TB) of data and that means you should always backup all your data and also delete some of the old data from your computer to make room for new ones. The best way to keep data in this case is to use an external portable hard drive and back everything up. This kind of external hard drive can store multiple TB of data and you can choose which size is right for you.
If you’re not dealing with GBs and TBs of data but still need to back up your computer data, you can use rewritable CD-ROM drives that can store a large number of megabytes (MBs) of data. I think you understand the idea.
Now let’s look at recovery approaches to databases used by organizations, as I mentioned earlier.
The entire database is periodically copied (backed up), usually to tapes, compact disks or external portable hard drives (which I described earlier). Backups can also be made incremental, i.e. only the changes since the last backup are saved. A log file is used to record the changes in the database with each update, usually the old and new values of the updated attributes.
If an error occurs:
If the database itself is damaged (media error, for example due to a main crash)
– The last backup has been loaded
– The updates of all logged (completed) transactions performed since the time of the last backup are displayed in the log. The transactions that were not yet committed must be restarted.
If the database itself is not damaged, but the correctness of the content cannot be guaranteed (for example, because a program with updates has crashed)
– The log is used to repeat committed changes (redo) and roll back uncommitted changes (undo). Then the uncommitted transactions can be restarted.
In summary, whether you are concerned about your computer’s data or database data, you always need backups, simply and clearly.