David Durant


Stairway to SQL Server Indexes

Filtered Indexes in SQL Server: Stairway to SQL Server Indexes Level 7

A filtered index eliminates unusable entries from the index, producing an index that is as beneficial as, but much smaller than, an unfiltered index. If a certain subset of a table's data is frequently requested, a filtered index can also be a covering index; resulting in a considerable reduction in IO.

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2011-08-24

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Stairway to SQL Server Indexes

Bookmarks in SQL Server Indexes: Stairway to SQL Server Indexes Level 6

A nonclustered index entry consists of search key columns, included columns, and the bookmark. The bookmark value will be either a RID or the clustered index's key, depending upon whether the table is a heap or a clustered index. Choosing the best clustered index for a table requires that you follow three guidelines to ensure that the index key will make a good bookmark.

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2011-08-03

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Question of the Day

Too Many Choices

I have a table, dbo.MasterBrands, with this data:

BrandID OfficialName
1       Samsung
2       Apple
3       Microsoft
4       Adidas
5       Coca-Cola
I run this query. What is returned for Coca-Cola?
SELECT CHOOSE(BrandID, 'Conglomerate', 'Tech and Design', 'Desktop', 'Apparel')
FROM dbo.MasterBrands;

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