方法一:sqlplus “用戶/密碼 as sysdba” sqlplus “sys/sys as sysdba”
方法二:sqlplus/nolog
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 ZHS16GBK;
ORA-12712: new character set must be a superset of old character set
提示我們的字符集:新字符集必須爲舊字符集的超集,這時我們可以跳過超集的檢查做更改:
SQL> ALTER DATABASE character set INTERNAL_USE ZHS16GBK;
--我們看到這個過程和之前ALTER DATABASE CHARACTER SET操作的內部過程是完全相同的,也就是說INTERNAL_USE提供的幫助就是使Oracle數據庫繞過了子集與超集的校驗.
SQL> shutdown immediate;
SQL> startup
SQL> select userenv('language') from dual; Oracle查看字符集