What merits of NCHAR as well as NVARCHAR for national language?

dear all,
while i set a field's datatype in NCHAR or NVARCHAR2, so as to record simple chinese, however, i found it can not work and prompt on "characterset do not match", althought both c/s charachterset has been set in simplified chinese.
yet once i set them back in normal CHAR or VARCHAR2 datatype, it record simplfied chinese very good.
so i question that what merits actually to NCHAR or NVARCHAR2, if there be, how can i use this two datatype?
thanks for your answer.
regards,
fredreick
null

In Oracle8i, specifying an NCHAR character set allows you to specify an alternate character set from the database character set for use in NCHAR, NVARCHAR2, and NCLOB columns. This is particularly useful for customers using a variable-width multibyte database character set because NCHAR has the capability to support Asian fixed-width multibyte encoding schemes, whereas the database character set cannot. The benefits in using a fixed-width multibyte encoding over a variable-width one are:
B7 optimized string processing performance on NCHAR, NVARCHAR2, and NCLOB columns
B7 ease-of-programming with a fixed-width multibyte character set as opposed to a variable-width multibyte character set.
The NCHAR datatype has been redefined in Oracle9i to be a Unicode datatype exclusively. You can specify one of the following two Oracle character sets as the national character set:
B7 AL16UTF16
B7 UTF8
The recommendation would be to use char and varchar for simplified chinese support, due to the coming change of NCHAR to be exclusively a Unicode data type.

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What merits of NCHAR as well as NVARCHAR for national language?

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