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indexes,

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Ramesh M #1
Member
14 Points
 Posted on 09 Nov 2011 03:27 PM IST Hi,

Please explain the difference b/t clustered and non-clusterd indexes.

Thanks in advance.

Regards,
Ramesh 
SQL Server     1069 views     Reply to this topic
Cherukuri Venkateswarlu #2
Member
140 Points
 Replied on 10 Nov 2011 05:18 AM IST Indexes are of two types. Clustered indexes and non-clustered indexes. When you craete a clustered index on a table, all the rows in the table are stored in the order of the clustered index key. So, there can be only one clustered index per table. Non-clustered indexes have their own storage separate from the table data storage. Non-clustered indexes are stored as B-tree structures (so do clustered indexes), with the leaf level nodes having the index key and it's row locater. The row located could be the RID or the Clustered index key, depending up on the absence or presence of clustered index on the table. 
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Harikrishna Sikhakolli #3
Member
108 Points
 Replied on 20 Mar 2012 02:48 PM IST when we create a primary key on the table it default creates clusterd index .
when we create a unique key on the table it default creates nonclusterd index .
just remember not viceversa. 
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Subramaniam R #4
Member
152 Points
 Replied on 06 Aug 2013 04:51 PM IST when we create a primary key on the table it default creates clusterd index .
when we create a unique key on the table it default creates nonclusterd index . 
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