What is the difference between a clustered index and a non-clustered index?
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
This is a great question. A single clustered index can be created on a table and this index physically sorts the data for the entire table based on the values in this column. A table can have up to 255 nonclustered indexes. Nonclustered indexes are based on order of the data, but do not physically sort the data.
A table can have one of the following index configurations:
- No indexes
- A clustered index
- A clustered index and many nonclustered indexes
- A nonclustered index
- Many nonclustered indexes
For more information about clustered indexes visit:
For more information about nonclustered indexes visit:
I hope this is helpful to you!
Do you have comments on this Ask the Expert Q&A? Let us know.
Dig Deeper on Microsoft SQL Server Performance Monitoring and Tuning
Related Q&A from Jeremy Kadlec
Adding non-clustered indexes to SQL Server columns and tables frequently queried is possible. Learn how to add non-clustered indexes to SQL Server ...continue reading
Learn how to view a query execution plan in SQL Server with SQL Server Management Studio or Query Analyzer. Review and decrease query plan sub tree ...continue reading
Want to change the collation to SQL Server 2005 standards after upgrading databases from SQL Server 2000? Learn the best approach involving DTS and ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.