November 2013
Intermediate to advanced
982 pages
34h 23m
English
book
Microsoft SQL Server 2012 Internals
by Bob Beauchemin Kalen Delaney Conor Cunningham, Jonathan Kehayias, Benjamin Nevarez, and Paul S. Randal
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SQL Server B-tree indexes
In SQL Server, most indexes are organized using a B-tree structure (see Figure 7-1). In fact, in this chapter, any reference to any kind of index without qualifying it indicates a B-tree index. The term B-tree stands for “balanced tree,” and SQL Server uses a special kind called B+ trees (pronounced “b-plus trees”). The difference between B-trees and B+ trees isn’t really relevant for this discussion of the way SQL Server indexes are managed, so the difference will be ignored. Index structures are referred to as simply B-trees. Unlike a normal tree, B-trees are always inverted, with their root (a single page) at the top and their leaf level at the bottom. The existence of intermediate levels depends on multiple factors. ...
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