查看Oracle字符集：
SQL> select * from nls_database_parameters;
PARAMETER VALUE
------------------------------ ----------------------------------------------------------------------------------------------------------------------------------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET AL32UTF8
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
PARAMETER VALUE
------------------------------ ----------------------------------------------------------------------------------------------------------------------------------------------------------------
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
NLS_NCHAR_CHARACTERSET AL16UTF16
NLS_RDBMS_VERSION 11.2.0.4.0
20 rows selected.
dbca时
-characterSet 对应NLS_CHARACTERSET
--NATIONALCHARACTERSET对应NLS_NCHAR_CHARACTERSET
alter system set nls_language='SIMPLIFIED CHINESE' scope = spfile;
alter system set nls_territory='CHINA' scope=spfile;
update props$ set VALUE$='SIMPLIFIED CHINESE' where name='NLS_LANGUAGE';
update props$ set VALUE$='CHINA' where name='NLS_TERRITORY';