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                            通常不命中索引有接種情況:

*   索引規范不合理,sql解析器不命中索引.
*   表中索引是以表中數據量字段最多的建立的索引,sql解析器不命中索引.(實際就是索引沒用,最后全局查找了)
*   bool的字段做索引,sql選擇器不命中索引.
*   模糊查詢 %like
*   索引列參與計算,使用了函數
*   非最左前綴順序
*   where對null判斷
*   where不等于
*   or操作有至少一個字段沒有索引
*   需要回表的查詢結果集過大（超過配置的范圍）
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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