How to view and modify the Oracle encoding format method

Select Userenv (' language ') from dual;

Simplified Chinese_china. Al32utf8

Sql> Conn/as sysdba;

sql> shutdown immediate;

Database dismounted.

sql> startup Mount;

Total system global Area 135337420 bytes

Fixed size 452044 bytes

Variable size 109051904 bytes

Database buffers 25165824 bytes

Redo Buffers 667648 bytes

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 UTF8

sql> shutdown immediate;

Sql> startup;

How to view and modify the Oracle encoding format method