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Difference between Clustered Index and Non clustered Index

January 3, 2010
Indexes-Indexing  is way to sort and search records in the table. It will improve the speed of locating and retrieval of records from the table.It can be compared with the index which we use in the book to search a particular record.
In Sql Server there are two types of Index
1) Clustered Index
2) Non Clustered Index

Clustered Index:– Clustered index physically stored the data of the table in the order of the keys values and the data is resorted every time whenever a new value is inserted or a value is updated in the column on which it is defined.
In a table only 1clustered index is possible.
In a clustered Index, the leaf node contains the actual data.

Non Clustered Index:- In case of Non clustered index it create a sperate list of key values (or created a table of pointers) which points towards the location of the data in the data pages.

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In a table, we can create 249 Non clustered indexes in SQL 2005 and 999 Non clustered indexes in SQL Server 2008 and onward.

In a non clustered Index, the leaf node contains the pointer to the data rows of the table.

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vivekjohari

I am currently working as a Senior Database Professional and have around 18 years of experience in database. Degree:- Master Degree in Computer(MCA) Certification course in Data Science & Machine Learning from Indian Institute of Technology (IIT), Delhi Work experience:- Designing of the database. Database Optimization. Writing Complex Stored Procedures,Functions,Triggers etc. Designing and developing SSIS & DTS packages. Designing SQL Reports using SSRS. Database Server Maintenance. Certification:- MCTS: DA-100: Analysing Data with Microsoft Power BI MCTS: DP-300: Administering Relational Databases on Microsoft Azure Microsoft certified Sql DBA in Sql server 2008 (MCTS). Microsoft certified BI professional in Sql server 2008 (MCTS). Oracle certified profession DBA in ORACLE 10g (OCP) certified profession DBA in ORACLE 9i (OCP) My other publication Technical Blog:- Technologies with Vivek Johari Guest Author and Blogger at sqlservercentral.com

31 Comments
  1. Santosh Kumar

    Vivek Ji it's good and simplest description of difference between Clustered Index and Non clustered Index. Thank You.

    Reply
  2. Priya R

    nice…simply superb

    Reply
  3. Trinath

    Hi Vivek,
    If i have one clustered index and 10 non-clusterd index on a table.
    when i insert new data into table without disabling the indexes.
    do i need to re-build them after inserting the data?

    Reply
  4. Trinath

    and how bad will be the performance if i insert the data in to a table with 10 indexes with out disabling them, compared to a table with no indexes and inserting the same data

    Reply
  5. Siva Krishna

    Hi vivek simply super…

    Reply
  6. Vimal Kumar Prajapati

    Nice article!! Now we can have 999 non clustered index per table.

    Reply
  7. admin

    Yes Vimal and I have added this in my article too:-)

    Reply
  8. Vimal Kumar Prajapati

    🙂

    Reply
  9. Albert Andrada

    Really Nice Information,Thank You Very Much For Sharing.
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    Reply
  10. siva ram

    Can you please explain it by taking some examples

    Reply
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