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Nonclustered Indexes
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Nonclustered Indexes
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rfr.ferrari
rfr.ferrari
Posted Monday, December 06, 2010 9:24 PM
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Comments posted to this topic are about the item
Nonclustered Indexes
rfr.ferrari
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Post #1030993
ziangij
ziangij
Posted Monday, December 06, 2010 11:36 PM
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Is the same number (16) applicable for a clustered index in SQL Server 2008 ?
Checked the link, could not find if the above number is different in case of clustered index. Please comment. thanks
Post #1031047
tommyh
tommyh
Posted Monday, December 06, 2010 11:43 PM
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ziangij (12/6/2010)
Is the same number (16) applicable for a clustered index in SQL Server 2008 ?
Checked the link, could not find if the above number is different in case of clustered index. Please comment. thanks
Sort of yes. See
http://msdn.microsoft.com/en-us/library/ms190197%28v=SQL.100%29.aspx
/T
Post #1031050
Hardy21
Hardy21
Posted Tuesday, December 07, 2010 12:28 AM
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ziangij (12/6/2010)
Is the same number (16) applicable for a clustered index in SQL Server 2008 ?
Checked the link, could not find if the above number is different in case of clustered index. Please comment. thanks
Yes it is.
If you check "CREATE INDEX (Transact-SQL)" in BOL, it mentions that: " Up to 16 columns can be combined into a single composite index key. All the columns in a composite index key must be in the same table or view. The maximum allowable size of the combined index values is 900 bytes."
Thanks
Post #1031062
Hardy21
Hardy21
Posted Tuesday, December 07, 2010 12:29 AM
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Straight forward question. Thanks
Thanks
Post #1031063
tommyh
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Posted Tuesday, December 07, 2010 12:34 AM
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Hardy21 (12/7/2010)
ziangij (12/6/2010)
Is the same number (16) applicable for a clustered index in SQL Server 2008 ?
Checked the link, could not find if the above number is different in case of clustered index. Please comment. thanks
Yes it is.
If you check "CREATE INDEX (Transact-SQL)" in BOL, it mentions that: " Up to 16 columns can be combined into a single composite index key. All the columns in a composite index key must be in the same table or view. The maximum allowable size of the combined index values is 900 bytes."
Not entierly accurate. The clustered index have an exception to the 16 columns limit. It can be 15 in some cases. From the link in my previous post
"Clustered index is limited to 15 columns if the table also contains a primary XML index or any spatial indexes."
/T
Post #1031067
Koen Verbeeck
Koen Verbeeck
Posted Tuesday, December 07, 2010 1:18 AM
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Nice and easy. Thanks!
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Post #1031076
paul.knibbs
paul.knibbs
Posted Tuesday, December 07, 2010 2:29 AM
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Why does the question specify SQL 2008 when the limit for this, AFAIK, was the same in earlier versions? Thought it might be a tricksy question about filtered indexes till I saw the answers!
Post #1031086
nigel.
nigel.
Posted Tuesday, December 07, 2010 2:36 AM
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Good question, thanks.
Further info on size limits can be found
here
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Post #1031089
WilliamD-
WilliamD-
Posted Tuesday, December 07, 2010 3:22 AM
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Slightly misleading wording. It should read "how many columns can be used in a nonclustered index key". The important part is to make clear that you are talking about the key columns of the index. Using the word "included" can be misinterpreted, especially since SQL 2005 where that is a keyword in indexing.
Regards,
WilliamD
Post #1031101
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