How does an SQL server manage indexes?

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Kalaiselvi

Online Mathematics tutor with 6 years experience(Online Classes for 10th to 12th)

An index in a table improves the query performance by speeding up the data lookup. By default, a query analyzer does a sequential scan on every row in a table until it finds the searched result. An index scan is much faster because an index acts as a pointer reference to the rows address in a table.
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I am online Quran teacher 7 years

An index in a table improves the query performance by speeding up the data lookup. By default, a query analyzer does a sequential scan on every row in a table until it finds the searched result. An index scan is much faster because an index acts as a pointer reference to the rows address in a table.
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