Answer Posted / chandrashekar

Secondary indices or secondary databases are used to access
a primary database by a key other than the primary key.
Recall that the Supplier Number field is the primary key of
the Supplier database. In this section, the Supplier City
field will be used as a secondary lookup key. Given a city
value, we would like to be able to find the Suppliers in
that city. Note that more than one Supplier may be in the
same city.

Both primary and secondary databases contain key-value
records. The key of an index record is the secondary key,
and its value is the key of the associated record in the
primary database. When lookups by secondary key are
performed, the associated record in the primary database is
transparently retrieved by its primary key and returned to
the caller.

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