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11 lines
518 B
ReStructuredText
11 lines
518 B
ReStructuredText
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Query execution
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How queries are executed in a particular database
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is usually considered an implementation detail hidden behind an abstraction layer,
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which normal users should not care about.
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As everyone who has used databases knows, however,
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it is at best a leaky abstraction, since bad query execution plans entail
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unacceptable performance characteristics,
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and fighting, or "optimizing" the query optimizers is a difficult but necessary task. |