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The Index Tuning Wizard takes as input a workload on a specified database. The tool iterates through several alternative sets of indexes and indexed views called configurations. It then chooses the configuration that results in the lowest cost for the given workload. Evaluating a configuration by materializing it physically is not practical because this approach requires adding and dropping indexes, which can be resource-intensive and affect operational queries on the system. Therefore, the Index Tuning Wizard must simulate a configuration without materializing it. SQL Server 2000 has been extended to support the ability to simulate a configuration and estimate the cost of evaluating a query for a simulated configuration. The illustration below (Figure 1) shows the architectural overview of the Index Tuning Wizard and its interaction with SQL Server 2000.
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A new feature available in Index Tuning Wizard for SQL Server 2000 enables you to tune the workload for a database where the tables have different sizes than in the current database. In the Select Tables to Tune dialog box, the user can specify the projected number of rows for a table. When performing the tuning, the Index Tuning Wizard takes the projected sizes into account when recommending indexes and indexed views. Table scaling can be used to account for the future growth of the database as well as to facilitate tuning on a test server by porting the recommendations to the production server where the tables may be larger or smaller.
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