March 2009
Intermediate to advanced
562 pages
15h 36m
English
Content preview from SQL Server 2008 Query Performance Tuning Distilled
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C H A P T E R 8
Fragmentation Analysis
As explained in Chapter 4, index column values are stored in the leaf pages of an index's B-tree structure. When you create an index (clustered or nonclustered) on a table, the cost of data retrieval is reduced by properly ordering the leaf pages of the index and the rows within the leaf pages. In an OLTP database, data changes continually, causing fragmentation of the indexes. As a result, the number of reads required to return the same number of rows increases over time.
In this chapter, I cover the following topics:
- The causes of index fragmentation, including an analysis of page splits caused by
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.