Saving your all data from loss is a very critical issue in database systems. Data losses occur due to many reasons.

• Hardware failure
• Viruses
• Transaction failure
• Software bugs

By following some recovery strategy you can prevent your data loss. Here some techniques are which is helpful to you:

Possible levels of recovery:

• Correct state recovery
• Past correct state recovery
• If possible, then previous state recovery
• Valid state recovery
• Consistent state recovery
• Prevention from crash

Techniques are:

• Salvation Program: If the system crashed first you have restored the system to a valid state. But remember never used recovery data. Used only in case when all other techniques fail or maybe not in use.
• Incremental dumping: Updated files must be copied to archive after completion of operations with some time interval.
• Backup Version: from the current version of database present some files and all files contains all previous value from regular backup version.
• Differential Backup: If you do full database backup, then you can get many advantages and most important is it includes all that which is required to rebuild the entire database.

How to perform a differential backup:

USE master;

GO

BACKUP DATABASE Employedetails

TO DISK=’t: \emp_diff.bak’

WITH INIT, DIFFERENTIAL;

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