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After view expansion, the SQL Server query optimizer compiles a single execution plan for the executing query.
The query optimizer searches though a set of possible execution plans for a query, and chooses the lowest-cost plan it can find, based on estimates of the actual time it will take to execute each query plan.
When a typical view is created, the metadata is defined by encapsulating a SELECT statement that defines a result set to be represented as a virtual table.
When a view is referenced in the FROM clause of another query, this metadata is retrieved from the system catalog and expanded in place of the view's reference.
Note: This course will also prepare certification candidates for the Microsoft Technology Associate Exam 98-364, Database Administration Fundamentals.
This document describes the improved indexed views capability of SQL Server 2005 Enterprise Edition.
In SQL Server 20, a view that has a unique clustered index is referred to as an indexed view.
The discussion in this paper applies to SQL Server 2005.
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After a unique clustered index is created on the view, the view's result set is materialized immediately and persisted in physical storage in the database, saving the overhead of performing this costly operation at execution time.
The indexed view can be used in a query execution in two ways.
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My SQL is by far the most popular database management system for small- to medium-sized web projects.