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conn 用户名 as sysdba

然后执行以下命令

>shutdown immediate; (把database停了)

>startup mount; (把database重开去可更改情況)

>alter system enable restricted session;

>alter system set job_queue_processes=0;

>alter system set aq_tm_processes=0;

>alter database open;

>alter database character set utf8;

OR

>alter database character set internal_use utf8;

>shutdown immediate;

>startup; (重开正常oracle)

Windows下查找/bin/sqlplus.exe

Linux进入sqlplus / as sysdba

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