>sqlplus /nolog

>conn / as sysdba

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 UTF8;

sql>shutdown immediate

sql>startup

查看字符集

sql>select userenv('language') from dual;
sql>select * from nls_database_parameters；