10.11 Restrictions on Character Sets
Identifiers are stored in
mysqldatabase tables (
db, and so forth) using
utf8, but identifiers can contain only characters in the Basic Multilingual Plane (BMP). Supplementary characters are not permitted in identifiers.
utf32character sets have the following restrictions:
None of them can be used as the client character set. See Impermissible Client Character Sets.
It is currently not possible to use
LOAD DATAto load data files that use these character sets.
FULLTEXTindexes cannot be created on a column that uses any of these character sets. However, you can perform
IN BOOLEAN MODEsearches on the column without an index.
The use of
ENCRYPT()with these character sets is not recommended because the underlying system call expects a string terminated by a zero byte.
RLIKEoperators work in byte-wise fashion, so they are not multibyte safe and may produce unexpected results with multibyte character sets. In addition, these operators compare characters by their byte values and accented characters may not compare as equal even if a given collation treats them as equal.