method_opt => ‘for all columns size repeat’ 重新分析现有直方图 method_opt => ‘for all columns size auto’ oracle决定收集哪些列的直方图(需要设置table monitoring) method_opt => ‘for all columns size skewonly’ oracle分析所有列的分布情况,生成直方图 method_opt => ‘FOR COLUMNS object_id siz...