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                            1. MySQL不支持多CPU對同一SQL并發處理;所以多個CPU對同一SQL的速度提升不了;
2. 64位使用32位的操作系統版本;
3. 內存不是越大越好,當內存容量超過了數據庫文件大小的時候,增大內存也沒有用了;
4. 內存的容量不僅對讀有效果,對寫入也有效果,多次寫入可以存入內存中,然后一次性的合并寫入到磁盤中;


## myisam
![](https://img.kancloud.cn/d0/f9/d0f957c221ed72bf6566ae31b978a1b3_842x315.png)


## innodb
![](https://img.kancloud.cn/39/fc/39fc6287cb5d9ddb180f5ffd23701529_1200x402.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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