July 2012
Intermediate to advanced
478 pages
10h 3m
English
Content preview from Microsoft SQL Server 2012 Performance Tuning CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Improving performance by a filtered index
The filtered column index is one of the enhancements of the non-clustered index provided in Microsoft SQL Server 2008, and it is still available in SQL Server 2012. We can consider a simple non-clustered index with the WHERE clause, as a filtered index. A well-defined filtered index reduces maintenance cost and index storage, and improves query performance.
Actually, a non-clustered index, whether it is a covering or include index, indexes all the rows available in a table, whereas a filtered index indexes only those rows that meet the criteria given in the WHERE clause of the CREATE INDEX command. This is the main reason that a filtered index needs low storage and displays improved performance.
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