Oracle in varchar2 (4000) the maximum number of characters can store

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Oracle in Varchar2 (4000) in the end how many Chinese characters, code set database can save, if it is GB2312, 2000 characters can be saved, if the database character set encoding is UTF-8, would be able to save a little more than 1,300. Since the two bytes representing characters GB2312 stored, and then the utf-8 occupies three bytes.