Oracle Character set and National Character Set

##CHARACTER SET
specifies the character set the database uses to store data. You cannot change the database character set after creating the database. The supported character sets and default value of this parameter depend on your operating system.

You can specify any supported character set except the following fixed-width, multibyte character sets, which can be used only as the national character set:  

JA16SJISFIXED  
JA16EUCFIXED  
JA16DBCSFIXED  

parameter is NLS_CHARACTERSET.

## NATIONAL CHARACTER SET
specifies the national character set used to store data in columns specifically defined as NCHAR, NCLOB, or NVARCHAR2. You cannot change the national character set after creating the database. If not specified, the national character set defaults to the database character set. See oracle8 Reference for valid character set names.
parameter is NLS_NCHAR_CHARACTERSET in database

you can use following query to check the value of the value of bath parameters,

col parameter format a25
col value format a20
Select *
  FROM nls_database_parameters
Where parameter like ‘%NLS%’
/

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