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SQL efficiency
Bad plan or something else? The first step in any tuning activity is determining the scope of an issue — so if a query is not performing satisfactory, then the first question is whether it’s query’s...
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Efficiency-based SQL tuning
Introduction In order to tune a query, you need to know two things: – can it be tuned, and if yes, then by how much – which part of the query (which operation, or which data object) is most promising...
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