linux 安装oracle默认语言为：
AMERICAN_AMERICA.WE8MSWIN1252
此语言中文展示位乱码。 通过oracle登录linux系统后进行如下操作：
修改方法（以改成UTF8为例）
以系统DBA权限登录sqlplus
$ sqlplus / as sysdba;
select userenv('language') from dual;
如果是：AMERICAN_AMERICA.WE8MSWIN1252 则需要调整编码格式为：AL32UTF8
SQL> shutdown immediate;
SQL> startup mount;
SQL> alter system enable restricted session;
SQL> alter system set job_queue_processes=0;
SQL> alter database open;
SQL> alter database character set internal_use AL32UTF8;
SQL> shutdown immediate;
SQL> startup
SQL>alter system disable restricted session;
2. SQL> shutdown immediate;
SQL> startup mount;
SQL> alter system enable restricted session;
SQL> alter system set job_queue_processes=0;
SQL> alter system set aq_tm_processes=0;
sql> alter database open;
SQL> alter database character set internal_use 你要的编码集;#比如ZHS16GBK
SQL> shutdown immediate;
SQL> startup;
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