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Vivek's SQL Notes

Vivek johari is currently a Analyst and have more that 5.5 yeras of experience in database. He has Master degree in Computer and also he is Microsoft certified Sql DBA (MCTS)& Microsoft certified SQl BI professional(MCTS). He is also Oracle certified profession(OCP)DBA in ORACLE 10g and ORACLE 9i.He has the experience of working in PL/SQL, T-SQL and SSIS/SSRS. His work basically involved designing and optimization of the Database.He has also published many database articles on his blog Technologies with Vivek Johari.

Difference between Clustered Index and Non clustered Index

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 datain the data pages.

In a table 249 non clustered index is possible.

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

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