Oracle 11g 修改中文字符集
安装了个Oracle 11g 发现中文保存到DB之后变乱码，用下面的方法修改DB字符集

D:\>sqlplus /nolog

SQL*Plus: Release 11.2.0.1.0 Production on Wed Nov 7 23:50:56 2012

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

SQL> conn / as sysdba     --需要使用SYSDBA帐户
Connected.
SQL>  startup mount       
ORA-01081: cannot start already-running ORACLE - shut it down first
SQL>  shutdown immediate;   --停止数据库
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>  startup mount          --启动数据库到 mount 状态
ORACLE instance started.

Total System Global Area 1686925312 bytes
Fixed Size                  2176368 bytes
Variable Size             989858448 bytes
Database Buffers          687865856 bytes
Redo Buffers                7024640 bytes
Database mounted.
SQL> alter session set sql_trace=true;

Session altered.

SQL>  alter system enable restricted session;

System altered.

SQL> alter system set job_queue_processes=0;

System altered.

SQL> alter system set aq_tm_processes=0;

System altered.

SQL> alter database open;

Database altered.

SQL> set linesize 120;      --INTERNAL_USE 参数可以忽略超集检查
SQL>  ALTER DATABASE character set INTERNAL_USE AL32UTF8; --修改字符集

Database altered.

SQL> shutdown immediate;        --再次关闭数据库
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> STARTUP             --启动数据库
ORACLE instance started.

Total System Global Area 1686925312 bytes
Fixed Size                  2176368 bytes
Variable Size             989858448 bytes
Database Buffers          687865856 bytes
Redo Buffers                7024640 bytes
Database mounted.
Database opened.
SQL> select * from v$nls_parameters where parameter = 'NLS_CHARACTERSET';

PARAMETER
----------------------------
VALUE
----------------------------
NLS_CHARACTERSET
AL32UTF8


SQL>