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range-condition selectivity for index [See index range-condition selectivity] ratios [See benefit-to-cost ratio; cache-hit ratio; correlation preference ratio; filter ratio; join ratio] RBO [See rule-based optimizer] read locks, disabling in queries redundant joins, enabling join order root nodes, multiple, in query diagram correlated subqueries affecting estimating cost of joins using large, join execution method for small rows, reading first rows quickly 2nd |