創建用戶 ,
CREATE USER username IDENTIFIED BY password
GRANT -----------
創建角色
CREATE ROLE rolename
GRANT 權限 to rolename
GRANT select
on employees
to usename
向uesname授權employees表的查詢權
收回用戶權限
REVOKE {SELECT ,INSERT]
on employees
FROM usename
[CASCADE CONSTRAINTS]
CREATE PUBLIC DATABASE LINK hq.acme.com
USING 'sales';
創建數據庫遠程連接。