Purpose of nls_lang

Hi
What is the purpose of setting nls_lang before export or import?
What happens if I dont set it ?
As far as I understand, it is related to client issue. Is it again come into play if I do the export/import directly from server ?
Suppose I want to change characterset from WE8MSWIN1252 to UTF-8.
I took export.
Create new database with utf8.
and import.
Do I need to set nls_lang prior to import or export?
I appreciate if anyone clear my doubts.

>
What is the purpose of setting nls_lang before export or import?
What happens if I dont set it ?
As far as I understand, it is related to client issue. Is it again come into play if I do the export/import directly from server ?
>
If you use datapump, never mind. If you use exp,imp, the main reason why to set NLS_LANG is the characterset component of it. Set it to the appropriate character set of the computer, you do the exp and imp on. Else you might loose special characters stored in your tables. It is not necessarily the same as the database character set.
Look at
http://download.oracle.com/docs/cd/E11882_01/server.112/e10729/ch3globenv.htm#sthref133
Kind regards
Uwe
http://uhesse.wordpress.com

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