Answer Posted / bandivenkateswarlu

Index is used to retrive the fast access the data from the
database by using the indexes. This is the efficient
mechanizam to retrive the data differnt databases.

indexes are two types of given below.

1.primary index.
2. secondary index.

1.primary index.: is used to access the only one record from
the database. That means that should be unique. It is also
called one to one relation ship.
2.secondary index: is used to access the data only more than
one record data base. This is called the secondary index.
The secondary index is used to relation ship is the
one-to-many relationships.

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