Characterset between server and db

Hi ,
I am having difficulty undertsanding the import export using these different characterset.
In UNIX environment
Server:US7ASCII character set and AL16UTF16 NCHAR character set
DB:AL32UTF8
In WINDOWS environment
Server:WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
DB:WE8ISO8859P1

From what I know, the DB character set is used for data types like VARCHAR2 and CLOB, and the national character set is used for NVARCHAR2 and NCLOB. You cannot change the DB character set without re-creating the database. US7ASCII is US English only. WE8MSWIN1252 is Windows CP-1252 (Latin1). AL32UTF8 is multibyte (2-4) Unicode, which includes all languages. If you database character set supports the language you need, than you don't need to use the alternate national data types. AL16UTF16 is a fixed 2 byte Unicode character set often used for Asian languages. A fixed byte character set is normally a bit more efficient and faster than multibyte Unicode, but not as universal, but still better than single byte. If the data is ISO-8859-1 encoded data, it should be no problem to import it into a UTF-8 database. UTF-8 can encode every character.
Edited by: Dude on Mar 1, 2011 8:46 PM

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