1、重现问题

SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL> select table_name from user_tables where table_name in('X_T','DEPT');
TABLE_NAME
------------------------------
X_T
SQL> create view  v_xff1
  2  as
  3  select * from X_T;
View created.
SQL> create view  V_XFF AS
  2  SELECT * FROM SCOTT.DEPT;
SELECT * FROM SCOTT.DEPT
                    *
ERROR at line 2:
ORA-01031: insufficient privileges
SQL> SELECT COUNT(*) FROM SCOTT.DEPT;
  COUNT(*)
----------
         4

通过上面的试验证明：
1）在同一个schema下，有查询权限，就可以创建视图
2）在不同schema下，即使有了查询权限，创建视图，还是会提示ORA-01031

2、查看相关权限情况

SQL> select * from SESSION_PRIVS where
  2  PRIVILEGE in('SELECT ANY TABLE','CREATE ANY VIEW','CREATE VIEW');
PRIVILEGE
----------------------------------------
SELECT ANY TABLE
CREATE VIEW
CREATE ANY VIEW
SQL> SELECT * FROM SESSION_PRIVS WHERE PRIVILEGE NOT IN(
  2  SELECT PRIVILEGE
  3    FROM ROLE_SYS_PRIVS
  4   WHERE ROLE IN(SELECT * FROM SESSION_ROLES));
no rows selected

通过上面权限查询得出：用户所具有的select 其他用户表的权限是用过role授权

3、单独授于select权限

SQL> conn / as sysdba
Connected.
SQL> grant select on SCOTT.DEPT to xff;
Grant succeeded.
SQL> conn xff/xifenfei
Connected.
SQL> create view  V_XFF AS
  2  SELECT * FROM SCOTT.DEPT;
View created.
SQL> select view_name from user_views;
VIEW_NAME
------------------------------
V_XFF
V_XFF1

4、产生问题原因
In order to create a view in a schema, that schema must have the privileges necessary to either select, insert, update, or delete rows from all the tables or views on which the view is based. The view owner must be granted these privileges directly, rather than through a role. The reason is that privileges granted to roles cannot be inherited via objects
ORA-1031 While Creating A View On A Table On Which The Select Privilege Is Granted Via A Role