以DBA身份进入SQLPLUS
SQL> sqlplus sys/sys as sysdba;（sys /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 AL32UTF8;(ZHS16GBK)
SQL> shutdown immediate;
SQL> startup;