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修改字符集的步骤如下：例如：修改当前字符集SIMPLIFIED CHINESE_CHINA.AL32UTF8为SIMPLIFIED CHINESE_CHINA.ZHS16GBK1、sqlplus / as sysdba2、shutdown immediate;3、startup mount;4、alter system enable restricted session;5、alter system set JOB_QUEUE_PROCESSES=0;6、alter system set

问题描述：oracle使用system用户不能登录解决办法：执行如下命令sqlplus /nologconn sys as sysdba