Can you explain the difference between clustered and non-clustered indexes in SQL Server?

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Answered by suresh

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Explaining the Difference Between Clustered and Non-Clustered Indexes in SQL Server

Explaining the Difference Between Clustered and Non-Clustered Indexes in SQL Server

Clustered and non-clustered indexes in SQL Server are two types of indexes used to enhance database performance.

Clustered Index:

A clustered index in SQL Server physically orders the data rows of a table on the disk based on the indexed column. Each table can have only one clustered index, and it determines the physical order of the data.

Non-Clustered Index:

In contrast, a non-clustered index does not alter the physical order of data on the disk. Instead, it creates a separate structure that points to the actual data rows. Multiple non-clustered indexes can be created on a single table.

One of the key differences between clustered and non-clustered indexes is that a clustered index directly affects the order of the data on disk, while a non-clustered index does not. Depending on the query requirements, choosing between a clustered and non-clustered index can significantly impact database performance.

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Answer for Question: Can you explain the difference between clustered and non-clustered indexes in SQL Server?