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equal to 1.0, affecting optimum execution plan less than 1.0, affecting optimum execution plan 2nd Mastering Oracle SQL (Mishra; Beaulieu) memory-only data access [See pure logical I/O] merge joins [See sort-merge joins] merged join and filter indexes Microsoft SQL Server [See SQL Server] Millsap, Cary (Optimizing Oracle Performance) MINUS operation [See set operations] Mishra, Sanjay (Mastering Oracle SQL) most recently used blocks [See MRU blocks] MRU (most recently used) blocks multiple-condition filter selectivity 2nd multitable queries |