What are the difference between clustered and a non-clustered index?
- A clustered index
is a special type of index that reorders the way records in the table are
physically stored. Therefore table can have only one clustered index. The
leaf nodes of a clustered index contain the data pages.
- A non clustered index
is a special type of index in which the logical order of the index does
not match the physical stored order of the rows on disk. The leaf node of
a non clustered index does not consist of the data pages. Instead, the
leaf nodes contain index rows.
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