DATA RECOVERY
Data recovery is about restoring the database to a state that is known to be correct after a failure. Policies must be in place whereby the risks to the data is assessed and then adequate provision is made to ensure that it will be possible to restore the data if necessary. The implementation of these policies must be monitored; when there are no failures from which to recover, it is very easy to overlook the need to prepare for the worst.
Causes of failure
The types of failure that need to be considered can be classified as:
transaction failures;
system crashes;
media failures.
A transaction is a logical unit of work; all or none of the operations within the transaction must be completed to ensure that the database remains in a ...
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