The utf8  character set permits only UTF-8  characters that take up to three bytes. This has led to reports such as that found in Bug #12600, which we rejected as “not a bug” . With utf8 , MySQL must truncate an input string when it encounters bytes that it does no understand. Otherwise, it is unknown how long the bad multibyte character is. 

One possible workaround is to use ucs2  instead of utf8 , in which case the “bad”  characters are changed to question marks. However, no truncation takes place. You can also change the data type to BLOB  or BINARY , which perform no validity checking. 

•The utf8mb4 , utf16 , utf16le , and utf32  character sets support BMP characters, as well as supplementary characters outside the BMP. 

A.11.16. Should “CJK”  be “CJKV” ? 

No. The term “CJKV”  ( Chinese Japanese Korean Vietnamese ) refers to Vietnamese character sets which contain Han (originally Chinese) characters. MySQL supports the modern Vietnamese script with Western characters, but does not support the old Vietnamese script using Han characters. 

As of MySQL 5.6, there are Vietnamese collations for Unicode character sets, as described in Section 10.10.1, “Unicode Character Sets” . 

A.11.17. Does MySQL permit CJK characters to be used in database and table names? 

Yes. 

A.11.18. Where can I find translations of the MySQL Manual into Chinese, Japanese, and Korean? 

The Japanese translation of the MySQL 5.6 manual can be downloaded from https://dev.mysql.com/ doc/. 

A.11.19. Where can I get help with CJK and related issues in MySQL? 

The following resources are available: 

•A listing of MySQL user groups can be found at https://wikis.oracle.com/display/mysql/List+of +MySQL+User+Groups. 

•View feature requests relating to character set issues at http://tinyurl.com/y6xcuf. 

•Visit the MySQL Character Sets, Collation, Unicode Forum. http://forums.mysql.com/ also provides foreign-language forums. 

## A.12 MySQL 8.0 FAQ: Connectors & APIs 

For common questions, issues, and answers relating to the MySQL Connectors and other APIs, see the following areas of the Manual: 

•Using C API Features 

•Common Problems with MySQL and PHP 

•Connector/ODBC Notes and Tips 

•Connector/NET Programming 

•MySQL Connector/J 8.0 Developer Guide 

