oracle创建用户赋予权限，删除权限

--删除用户及及用户下的所有数据
drop user xxx   cascade;

--创建用户赋予密码
create user xxx   identified by 1234;

--赋予权限
grant  dba to  xxx;

--删除权限
revoke dba from xxx;

--赋予用户登录数据库的权限
grant create session to xxx;

--授予用户操作表的权限
grant unlimited tablespace to xxx;
grant create tablespace to xxx;
grant alter tablespace to xxx;
grant drop tablespace to xxx;
grant manage tablespace to xxx;

--撤销用户操作表空间的权限
revoke unlimited tablespace from xxx;
revoke create tablespace from xxx;
revoke alter tablespace from xxx;
revoke drop tablespace from xxx;
revoke manage tablespace from xxx;

grant create session to zhangsan;--授予zhangsan用户创建session的权限，即登陆权限
grant unlimited session to zhangsan;--授予zhangsan用户使用表空间的权限
grant create table to zhangsan;--授予创建表的权限
grant drop table to   zhangsan;--授予删除表的权限
grant insert table to zhangsan;--插入表的权限
grant update table to zhangsan;--修改表的权限

grant select on tablename to zhangsan;--授予zhangsan用户查看指定表的权限
grant drop on tablename to zhangsan--授予删除表的权限
grant insert on tablename to zhangsan;--授予插入的权限
grant update on tablename to zhangsan;--授予修改表的权限

select * from user_sys_privs;--查看当前用户所有权限
select * from user_tab_privs;--查看所用用户对表的权限
select * from user_sys_privs;--查看当前用户所有权限
select * from user_tab_privs;--查看所用用户对表的权限