Indexing is a data structure technique to efficiently retrieve records from the database files based on some attributes on which the indexing has been done. Indexing in database systems is similar to what we see in books.
Indexing is defined based on its indexing attributes. Indexing can be of the following types −
Primary Index< − Primary index is defined on an ordered data file. The data file is ordered on a key field. The key field is generally the primary key of the relation.
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