oracle终端sqlplus显示乱码问题

sqlplus登陆oracle服务器查询表显示中文是?乱码

SQL> select * from test11;

ID

----------

NAME

--------------------------------------------------------------------------------

111

??

222

??

333

??????

SQL> select userenv('language') from dual;

USERENV('LANGUAGE')

----------------------------------------------------

AMERICAN_AMERICA.AL32UTF8

[oracle@fx ~]$ export NLS_LANG="AMERICAN_AMERICA.AL32UTF8"

SQL> insert into test11 values(334,'张东');

1 row created.

SQL> select * from test11;

ID NAME

---------- --------------------

334 张东

111 肖明

222 吴明

333

SQL> insert into test11 values(335,'吴敏');

1 row created.

SQL> select * from test11;

ID NAME

---------- --------------------

334 张东

335 吴敏

111 肖明

222 吴明

333