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                            ~~~
在數據庫里面運行，查詢是否開啟
show variables like '%quer%';
看到尾off 代表沒有開啟
在/etc/my.cnf 
  加入以下圖片
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /home/mysql/mysql-slow.log
~~~
![](https://img.kancloud.cn/6d/bb/6dbbdf50a08d6e3eb0dd380fab05d26f_547x219.png)
~~~
重啟數據庫
/etc/init.d/mysql restart
查詢是否開啟成功
show variables like '%quer%';
~~~
![](https://img.kancloud.cn/11/0d/110dd3d8b79691a3fcdc5c8888bd9195_607x392.png)
~~~
on 代表已經開啟了，然后在數據庫里面運行語句  超過1秒，
SELECT SLEEP(3)
~~~
![](https://img.kancloud.cn/b3/bb/b3bb7224d140afd15220f1b831c20f2b_693x170.png)
~~~
如上可看到已經記錄了，慢查詢
~~~

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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