1.版本确认
SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE    11.1.0.6.0      Production
TNS for Linux: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production

2.报错信息，现象
SQL> startup;
ORACLE instance started.

Total System Global Area 313860096 bytes
Fixed Size                  1299624 bytes
Variable Size             297798488 bytes
Database Buffers            8388608 bytes
Redo Buffers                6373376 bytes
ORA-12709: error while loading create database character set

3.处理过程
1).查询到数据库使用的字符集
SQL> select userenv('language') from dual;

USERENV('LANGUAGE')
----------------------------------------------------
AMERICAN_AMERICA.US7ASCII

2).在.bash_profile配置文件中添加NLS_LANG环境变量为AMERICAN_AMERICA.US7ASCII
$ vi ~/.bash_profile
export NLS_LANG=AMERICAN_AMERICA.US7ASCII

3).是参数文件生效
$ . ./.bash_profile

4).重新启动数据库，问题处理完成
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>
SQL> startup;
ORACLE instance started.

Total System Global Area 313860096 bytes
Fixed Size                  1299624 bytes
Variable Size             289409880 bytes
Database Buffers           16777216 bytes
Redo Buffers                6373376 bytes
Database mounted.
Database opened.

-- The End --

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【故障处理】11g数据库在启动之后报ORA-12709字符集错误

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