The description of data is known
as the system catalog or data dictionary or metadata.
For example when a table of a database is designed,
the data type, size, format and other descriptions
of fields are specified. This is an example of metadata,
which describes the properties of data to be stored
into fields of table.
The data of any organization is its
integral part. The data is very important for developing
new products and their marketing. The data must be
accurate and available when needed. This is the reason
that all organization must organize and manage their
data into database. The databases are used for variety
of purposes in as organization. For example, when
you purchase goods from your local supermarket, the
checkout assistant will pass the purchased product
through a scanner device known as bar code reader.
This device will read the bar code printed on the
product and gives the accurate price of the item.
Actually, the bar code reader is accessing the database,
which contains the information about the products.
The bar code reader is linked to a database application
program, which uses the bar code to access price of
item. The database program automatically updates the
database.
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