The value of parameters 'NLS_CHARACTERSET' and 'NLS_NCHAR_CHARACTERSET' is UTF-8 for source database from where i am reading data, and AL32UTF8 and UTF-8 for target database where i am writing data. I am reading data from a text file which has english, european and asian characters, I am using UTF-16 code page to read from source flat file to preserve asian characters. I am loading source database with this flat file. Can it create a problem if i write UTF-16 code page values to UTF-8 code page, will it preserve the original character values ? I can see signs such as ¿¿¿¿ question mark upside down instead of ?