June 2015
Intermediate to advanced
1800 pages
70h 6m
English
book
Microsoft SQL Server 2014 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft SQL Server 2014 Unleashed
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Using Multiple Indexes
SQL Server allows the creation of multiple indexes on a table. If a query has multiple SARGs that can each be efficiently searched using an available index, the Query Optimizer in SQL Server can make use of multiple indexes by intersecting the indexes or using the index union strategy.
Index Intersection
Index intersection is a mechanism that allows SQL Server to use multiple indexes on a table when you have two or more SARGs in a query and each can be efficiently satisfied using an index as the access path. Consider the following example:
SELECT SalesOrderID, OrderDate FROM Sales.SalesOrderHeader WHERE SalesPersonID = 276 AND CustomerID = 30107
In this example, the Query Optimizer ...
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