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                            ### MyISAM引擎的底層實現
MyISAM 用的是非聚集索引方式，即數據和索引落在不同的兩個文件上。MyISAM 在建表時以主鍵作為 KEY 來建立主索引 B+樹，樹的葉子節點存的是對應數據的物理地址
![](https://img.kancloud.cn/9c/ba/9cbac29a6e84833dcd753b607b034cb9_1440x583.png)

#### 普通索引
當我們為某個字段添加索引時，我們同樣會生成對應字段的索引樹，該字段的索引樹的葉子節點同樣是記錄了對應數據的物理地址，然后也是拿著這個物理地址去數據文件里定位到具體的數據記錄
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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