查询字符集

select userenv('language') from dual;

修改前字符集为：SIMPLIFIED CHINESE_CHINA.AL32UTF8

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.

Total System Global Area 5027385344 bytes
Fixed Size 2261888 bytes
Variable Size 1006636160 bytes
Database Buffers 4009754624 bytes
Redo Buffers 8732672 bytes
Database mounted.
SQL> alter system enable restricted session;

System altered.

SQL> alter system set JOB_QUEUE_PROCESSES=0;

System altered.

SQL> alter system set AQ_TM_PROCESSES=0;

System altered.

SQL> alter database open;

Database altered.

SQL> alter database character set internal_use ZHS16GBK;

Database altered.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area 5027385344 bytes
Fixed Size 2261888 bytes
Variable Size 1006636160 bytes
Database Buffers 4009754624 bytes
Redo Buffers 8732672 bytes
Database mounted.
Database opened.

select userenv('language') from dual;
USERENV('LANGUAGE')
----------------------------------------------------
SIMPLIFIED CHINESE_CHINA.ZHS16GBK