Multilingual fields in same database

Hi Members
We are developing a multilingual application with dot net and oracle version 8i or higher. Our requirement is such that there would be only few varchar fields which would be stored in other languages. Apart from that all rest of the fields would always be english. I had a couple of questions for the same
1. Would there be any environment level changes required to be done on oralce server
2. What configuration needs to be done to oralce database
3. Is it possible that the database has the english settings and only the fields which need to be stored in other language will have different settings. I have read about nchar and nvarchar datatypes. Will keeping these datatypes be the only thing required and not other settings would be required to change.
Hope my question is clear.
Anticipating help from the experts.

- Trying to support Oracle versions 8i and higher is rather broad. That encompasses 8 major releases-- 8.1.5, 8.1.6, 8.1.7, 9.0.1, 9.2.0, 10.1.0, 10.2.0, and 11.1.0 at the moment. So you would either have to limit yourself to the functionality available in 8.1.5, which is comparatively quite limited, or maintain different code for different database releases. Since 9.2 is no longer in Premier Support and 8i was depricated a long time ago, I'd strongly suggest reconsidering that requirement.
- Particularly if you want to support ancient versions of Oracle like 8.1.5, I'd suggest putting everything in VARCHAR2 fields and not touching NCHAR/ NVARCHAR2 fields if you can avoid it. This will require choosing a database character set that supports all the languages the database will need to support-- I'd generally suggest choosing Unicode (UTF8 or AL32UTF8). That may have to depend on the database version-- AL32UTF8 wasn't available in 8.1.5 and I believe that the old UTF8 character set was depricated before 11.1.
- Column length will likely be an issue. UTF-8 is a variable length character set, so characters require between 1 and 3 bytes (1 and 4 bytes in AL32UTF8). And prior to 9i, VARCHAR2 fields could only be specified in bytes. So if you want to store an arbitrary 30 characters, you'd need to declare a VARCHAR2(90) or VARCHAR2(120) column. But that would then allow you to store 90 or 120 English language characters.
- Depending on the specifics of the particular driver and API you intend to use, there may be some configuration that needs to be done on the client side to ensure that the NLS_LANG is set appropriately.
Justin

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