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Optimizing Data AccessAn execution plan, as described in Chapter 10, is composed of several operations. The most commonly used operations are those that access, filter, and transform data. This chapter specifically deals with data access operations, or, in other words, how the database engine is able to access data.

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Die akuten Infektionskrankheiten,. hei?t das Eindringen eines Mikroorganismus — Viren etwas vereinfachend diesen zugerechnet — in ein gr??eres Lebewesen; hat es Krankheitserscheinungen zur Folge, spricht man von einer . und wenn diese geh?uft und lebensgef?hrdend auftritt, von einer ..

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Configuring the Query OptimizerThe query optimizer is directly responsible for the performance of SQL statements. For this reason, it makes sense to take some time to configure it correctly. In fact, without an optimal configuration, the query optimizer may generate inefficient execution plans that lead to poor performance.