linux下面是用sqlplus操作數據庫，出現問號：
[oracle@rac2 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Thu Aug 209:19:56 2012
Copyright (c) 1982, 2009, Oracle. All rightsreserved.
???: 應該是Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0- 64bit Production
With the Partitioning, Real Application Clusters,Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
解決辦法：
SQL> show parameter nls_la
NAME TYPE VALUE
------------------------------------ -----------------------------------------
nls_language string SIMPLIFIEDCHINESE
然後修改環境變量：NLS_LANG
[oracle@rac2 ~]$ exportNLS_LANG=american_america.zhs16gbk
如果要使之永久生效，可以添加這個變量到oracle 用戶環境 .bash_profile中。