摘要：
纯属自己理解，如有误导概不负责O(∩_∩)O加索引：mysql> flush status;Query OK, 0 rows affected (0.00 sec)mysql> flush tables;Query OK, 0 rows affected (0.02 sec)mysql> explain select * from userinfo where username='test1'\G*************************** 1. row *************************** id: 1 select_type: S 阅读全文
