添加用户：（随着用户的创建，自动产生与用户同名的schema）

CREATE USER "TESTER" PROFILE "DEFAULT" IDENTIFIED BY "TESTER" DEFAULT TABLESPACE "TESTDATA" TEMPORARY TABLESPACE "TESTTEMP" ACCOUNT UNLOCK;

赋权:

（这些权限是开发中使用的权限，如果用户生产环境，请自行对于用户创建相应的系统权限）

据说生产环境下，只是connect resource这样的角色就可以了。

GRANT "CONNECT" TO "TESTER";

GRANT "RESOURCE" TO "TESTER";

GRANT "DBA" TO "TESTER";

GRANT "EXP_FULL_DATABASE" TO "TESTER";

GRANT "IMP_FULL_DATABASE" TO "TESTER";

用户修改密码，解锁:

ALTER USER "SCOTT" IDENTIFIED BY "*******"

ALTER USER "SCOTT" ACCOUNT UNLOCK

1.查看所有用户：

select * from dba_user;

select * from all_users;

select * from user_users;

2.查看用户系统权限：

select * from dba_sys_privs;

select * from all_sys_privs;

select * from user_sys_privs;

3.查看用户对象权限：

select * from dba_tab_privs;

select * from all_tab_privs;

select * from user_tab_privs;

4.查看所有角色：

select * from dba_roles;