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In summary Dbvisit Replicate relies on the target database client settings for handling of NLS issues. For an Oracle target database, set the NLS_LANG environment variable to "AMERICAN_AMERICA.source_db_charset". The AMERICAN_AMERICA part ensures unified number and date formats and specifying the source database charset ensures that the client libraries handle any non-ASCII characters properlydoes not rely on any NLS variables to function properly.

It does not depend on any NLS setting in the user's environment. Rather, it overwrites NLS_LANG and so should not depend on any implicit conversion, meaning that it is not affected by any other environmental settings.