MySQL: 經常使用命令

一、查看慢查詢超時時間值
use performance_schema;
select * from variables_by_thread where variable_name = 'long_query_time';

二、查看MySQL當前線程
show processlist;

三、建立wayne用戶，設置密碼，容許全部網段訪問
use performance_schema;
1. create user 'wayne'@'%' identified by '123';
drop user 'wayne'@'%';
2. create user 'wayne'@'192.168.32.%' identified by '123';
drop user 'wayne'@'192.168.32.%';
3. show grants;  查看用戶權限
show grants for 'wayne'@'%';  查看'wayne'@'%'用戶權限
4. grant select,update,insert,delete on test.* to 'wayne'@'%';  賦予'wayne'@'%'用戶對test庫下全部tables增刪改查的權限