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Use when a query, report or PL/SQL unit is slow, before adding an index or a hint, or when someone says "cham", "toi uu truy van", "optimize this query", "why is this report slow", "full table scan". Measures with the optimizer's own plan and statistics, changes one thing at a time, and proves the gain with the same measurement - license-safe, no AWR/ASH or Tuning Pack.