Explain an index?



Explain an index?..

Answer / Akhilendra Kumar Pandey

An index is a database structure used to speed up the retrieval of rows from a table based on one or more columns. It works by storing the value of the indexed column(s) and a reference to the row's location in the table. When a query uses the indexed column(s), Oracle can quickly find the relevant rows without having to scan the entire table.

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