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

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Chapter 1. SQL Query Performance tuning

Query performance tuning is an important part of today's database applications. Often you can achieve large savings in both time and money with proper query performance tuning. Hardware performance is constantly improving, which can lead to an attitude suggesting that other methods of performance tuning are no longer important. Upgrades to SQL Server—especially to the optimizer, which helps determine how a query is executed, and the query engine, which executes the query—lead to better performance all on their own. The beauty of query performance tuning is that, in many cases, a small change to an index or a SQL query can result in a far more efficient application at a very low cost.

There are, however, many ...

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