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 ZHS16GBK;
SQL>SHUTDOWN IMMEDIATE;
SQL>STARTUP;