Clustered Indexes A clustered index is a special type of index that groups related data items together in the database. This means that the index physically...
Clustered Indexes
A clustered index is a special type of index that groups related data items together in the database. This means that the index physically sorts the data items based on the values in the key field(s).
How it works:
When a query is executed, the database first searches the clustered index for the data items matching the key field(s).
This significantly reduces the number of data items the database needs to search through, as it only considers the relevant subset of data.
In some cases, the clustered index can even store the actual data items, reducing the need for additional data access.
Benefits of clustered indexes:
Faster query performance
Reduced storage space required
Improved data integrity
Example:
Imagine a database of customers with the following columns:
ID (primary key)
Name
Address
City
A clustered index on the "Name" column would group the customer data items by their names, allowing the database to quickly find a customer by name. This would significantly improve the performance of searches and queries based on the name field