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                            **系統數據庫性能優化**
數據庫的優化對于訪問量與數據量大的系統有著非常重要的作用，緩存對于實時性不高而且訪問量大的數據很重要，可以減少不必要的sql查詢。
1.對于需要where或order by 的字段 采用索引，避免全表掃描
2.對于需要關聯的表，數據量大的表，放棄使用表連接，使用二次查詢或懶加載
3.使用緩存處理實時性不高和訪問高的數據


![](https://box.kancloud.cn/d39f73373337dc89cf0b3356352dcf49_373x325.png)

**優化效果圖**
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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