select value$ from props$ where name='NLS_CHARACTERSET'';
export NLS_LANG="SIMPLIFIED CHINESE_CHINA.ZHS16GBK"
source .bash_profile
sqlplus / as sysdba
shutdown immediate;
startup mount;
alter session set SQL_TRACE=TRUE;
alter system enable restricted session;
alter system set job_queue_processes=0;
alter system set aq_tm_processes=0;
alter database open;
alter database character set INTERNAL_use zhs16GBK;
shutdown immediate;
startup;