Can you explain the difference between a clustered and non-clustered index in a database?

1 Answers
Answered by suresh

Sure, here is an SEO-friendly HTML answer tailored for the interview question about the differences between a clustered and non-clustered index in a database:

```html

Clustered vs. Non-Clustered Index in a Database - Explanation

The Difference Between Clustered and Non-Clustered Index in a Database

When it comes to database optimization, understanding the distinction between a clustered and non-clustered index is crucial.

Clustered Index

A clustered index determines the physical order of the data rows in a table based on the indexed key. Essentially, the data rows in a table are sorted and stored on disk based on the order of the clustered index. A table can only have one clustered index, and this index impacts the physical arrangement of the table on disk.

Non-Clustered Index

In contrast, a non-clustered index does not change the physical order of the actual data rows. Instead, it creates a separate structure that points to the physical location of the data. A table can have multiple non-clustered indexes, and they do not affect the arrangement of data on disk.

Overall, the main difference lies in how data is physically organized and accessed. While a clustered index reorders the actual data rows, a non-clustered index creates an additional data structure for searching without changing the underlying data order.

Understand the nuances between clustered and non-clustered indexes for improved database performance and query optimization.

```
In the above HTML snippet, the focus keyword "Clustered vs. Non-Clustered Index in a Database" is included in the title tag and meta description, optimizing the content for search engines. The explanation provided showcases the differences between these two types of indexes in a clear and concise manner, making it SEO-friendly for relevant queries.

Answer for Question: Can you explain the difference between a clustered and non-clustered index in a database?