Updating system specification

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If a database is not properly designed it can give rise to modification anomalies.

Modification anomalies arise when data is added to, changed or deleted from a database table.

If there is extensive damage to a wide portion of the database due to catastrophic failure, such as a disk crash, the recovery method restores a past copy of the database that was backed up to archival storage (typically tape) and reconstructs a more current state by reapplying or redoing the operations of committed transactions from the backed up log, up to the time of failure.

Customers will have access to customer functions, and the employees will have access to both customer and flight management functions.

w=531&ssl=1 531w, https://i2com/krazytech.com/wp-content/uploads/AD-ER-diagram-of-airline-database.jpg? resize=300,198&ssl=1 300w" sizes="(max-width: 531px) 100vw, 531px" data-recalc-dims="1"/The basic objective of normalization is to reduce redundancy which means that information is to be stored only once.

Storing information several times leads to wastage of storage space and increase in the total size of the data stored.

Distributed database implies that a single application should be able to operate transparently on data that is spread across a variety of different databases and connected by a communication network as shown in below figure.

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