What is the different with the NLS setting in installation

I mean,
1.when I install the Oracle, set the native LANG to one(call it A), and client access it with the NLS set to another(call it B), what the different between if I install it with B directly? the client can get same result, isn't it?
2.For I upgrade a Oracle7 to oracle8i, the NLS keep unchanged(ASCII), both the server and the Client(developed with developer2000) runs OK. But I need exchange data with another Oracle8, whose NLS is different(ZHKGB2312,I forget it). when I upgraded the server(change to the same one,zhkgb2312), the original table size changed from 6 to 12, so the client can not run correctly.
Did anybody meet the same thing? and any advice for me to solve this problem?

>>when I install the Oracle, set the native LANG to one(call it A),
You mean your database was created using character set A ?
>>and client access it with the NLS set to another(call it B)
You mean your client NLS_LANG character set is B ?
what the different between if I install it with B directly? the client can get same result, isn't it?
From reading your 2nd question, I am guessing that you have Chinese data in both of your USA7ASCII and ZHKGB2312 database, and you want to exchange data between them. I am sure that this is working for all your English ASCII data, but not for the Chinese 2 byte data. This is because Oracle handles the character set conversions between the databases (character set conversion occurs only when the 2 character sets are different),the real problem is that you are using the wrong database character set to store your chinese data; US7ASCII can not process Chinese data correctly, they got into your database because you set the client character set to be the same as the database character set, hence you are fooling Oracle that you are feeding in US7ASCII data.
When you try to exchange data between databases, Oracle does not know how to receive or send these Chinese character from inside an US7ASCII database, it does not know what character set these 8 bit characters are encoded in, US7ASCII should contain 128 characters only.
Please refer to the Globalization Support FAQ - on the Globalization Support website http://technet.oracle.com/tech/globalization/content.html
for more information on Database character set and NLS_LANG client character set.

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