Overview of database recovery

Failure is inevitable

Computer hardware failure
Software error
Operator error
Malicious destruction

The impact of the failure

Abnormal interruption of running transaction , Affect the correctness of the data in the database
Destroy the database , Total or partial loss of data

Database recovery

The database management system must have the ability to restore the database from the wrong state to a known correct state ( Also known as a consistent state or a complete state ) The function of , This is how the database recovery management system responds to failures

Recovery subsystem is an important part of database management system

Recovery technology is an important index to measure the quality of the system

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