SQL> 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 ZHS16GBK; SQL> select * from v$nls_parameters; SQL> shutdown immediate; SQL> startup