Differences between Clustered Index and NonClustered Index

non-clustered-vs.md

Parameters	Clustered	Non-clustered
Use for	You can sort the records and store clustered index physically in memory as per the order.	A non-clustered index helps you to creates a logical order for data rows and uses pointers for physical data files.
Storing method	Allows you to stores data pages in the leaf nodes of the index.	This indexing method never stores data pages in the leaf nodes of the index.
Size	The size of the clustered index is quite large.	The size of the non-clustered index is small compared to the clustered index.
Data accessing	Faster	Slower compared to the clustered index
Additional disk space	Not Required	Required to store the index separately
Type of key	By Default Primary Keys Of The Table is a Clustered Index.	It can be used with unique constraint on the table which acts as a composite key.
Main feature	A clustered index can improve the performance of data retrieval.	It should be created on columns which are used in joins.