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[TOC]

# 查詢執行路徑

![](https://box.kancloud.cn/39bd107cbcc1ff24cf80d632d25aa82e_489x504.png)

1. 客戶端發送一條查詢給服務器
2. 服務器先檢查查詢緩存,如果命中了緩存,則立刻返回存儲在緩存中的結果.否則進入下一階段
3. 服務端進行SQL解析,預處理,再由優化器生成對應的執行計劃
4. Mysql根據優化器生成的執行計劃,調用存儲引擎的API來執行查詢
5. 將結果返回給客戶端



                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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