Mariadb-操做命令

1、 建立數據庫

CREATE DATABASE IF NOT EXISTS table_name DEFAULT CHARSET utf8 COLLATE utf8_general_ci;

2、建立權限

grant all privileges on `001`.* to `001`@'%' identified by '001123';
grant all privileges on `004`.* to `004`@'%' identified by '004123';

3、刷新權限

flush privileges;

4、查詢SQL語句-查詢等於null的值，`answer`字段設置成0

update `cn_examination_questions` set answer=0 where ISNULL(answer)

5、查看最大連接數量和設置連接數量

show variables like "max_connections";
set global max_connections = 500;

6、查看連接時長和設置連接時長

show global variables like 'wait_timeout';
set global wait_timeout=10;