sqlplus logconn /as sysdbashutdown 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;set linesize 120;alter database character set zhs16gbk;RROR at line 1:　　ORA-12712: new character set must be a superset of old character setALTER DATABASE character set INTERNAL_USE zhs16gbk;ALTER SESSION SET SQL_TRACE=FALSE;shutdown immediate;STARTUPselect NLS_CHARACTERSET from nls_database_parameters;