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SQL Server 2008 Query Performance Tuning Distilled by Grant Fritchey, Sajal Dam

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Chapter 5. Database Engine Tuning Advisor

SQL Server's performance largely depends upon having proper indexes on the database tables. However, as the workload and data change over time, the existing indexes may not be entirely appropriate, and new indexes may be required. The task of deciding upon the correct indexes is complicated by the fact that an index change that benefits one set of queries may be detrimental to another set of queries.

To help you through this process, SQL Server provides a tool called the Database Engine Tuning Advisor. This tool helps identify an optimal set of indexes and statistics for a given workload without requiring an expert understanding of the database schema, workload, or SQL Server internals. It can also recommend ...

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