No matter how reliable your database management system is, you cannot guarantee a failure-free transaction every time. There are indeed several types of failures that affect database processing. Each of them needs to be addressed in distinct manner.
Some failures may affect the disk storage, while some may only affect the data items of the database residing in the main memory during the transaction processing. So now, let us take a deeper look at some of the major types of database failures. Here you go!
Some of the most Common Database Failures
- System Crash
This failure usually refers to any kind of bugs or hardware malfunction in the operating system or the database software. It can bring the processing of transaction to a halt and can even cause the loss of content residing on the volatile storage such as main memory, cache memory, RAM, etc.
- Statement failure
As we know, the database reflects the output based on the SQL queries or statements. So, a statement failure, as it name suggests, can be referred to as the inability of database system to execute the given SQL statement.
- Media failure
This type of failure is considered to be one of the most serious failures. In case of media failure, there are chances of the entire data loss if appropriate backup process is not followed. A common example of media failure is the disk head crash.
- Application software errors
As the name suggests, this type of errors are caused due to several factors such as bad input, resource limit exceeded, or any such factors related to the application software. The logical or internal errors are also included in this category that causes the transaction to fail.
Importance of SQL Server Database Backup Plans
You may think that your data files can be prevented from any kind of loss by just replicating them to different locations in your disk which is normally called backup. Well, Regular backups are essential in the first place, but even they are subject to several failures that may include the loss or breaking of hard disks and other non-volatile storage devices.
In case, any kind of failure strikes your SQL server databases, a proper plan and a way of recovery from that failure is needed, beforehand. A good backup can indeed be the best way to recover from most of the failures, especially when your data is too critical or important.
In case, you lose a database or any of the table becomes corrupt, then you can simply reload your data from the backup. In addition, if you lose the whole server, then you may need to set up a new server and re-install the SQL Server backup software, before using any of your backups.
One of the most effective ways to prevent any kind of data loss and to recover your original data in case of any failure is to store your entire SQL server database off-site. A secure off-shore backup can save you from many serious hassles in future.