How Index will work in Oracle

Hi All,
How Index will work in Oracle ? By using index, why the query performance will be increased ?

How Index will work in Oracle ? By using index, why
the query performance will be increased ?Have you ever looked at a large reference book?
When you want to find something in that book, do you look at each page consecutively until you find what you want or do you look at the index in the back of the book to find the page numbers that relate to what you want to find?
;)

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