Topic 19518 min readStructured Tutorial
Clustered Index in SQL Server
Quick Answer
A clustered index in SQL Server determines the physical order of data in a table based on the indexed column(s). It improves query performance by sorting and storing rows physically in the index order. Each table can have only one clustered index because data rows can be sorted in only one order.
Learning Objectives
- Understand what a clustered index is and how it organizes data in SQL Server.
- Identify the differences between clustered and nonclustered indexes.
- Learn how clustered indexes improve query performance and when to use them.
Introduction
Indexes are essential for improving query performance in SQL Server databases.
A clustered index is a special type of index that defines the physical order of data in a table.
Understanding clustered indexes helps you design efficient databases and optimize queries.
