[Koha-bugs] [Bug 18336] Use utf8mb4 instead of utf8 for MySQL tables, columns, and connections

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=18336

--- Comment #72 from Jonathan Druart <jonathan.druart at bugs.koha-community.org> ---
The only thing I found in the mysql doc is:

"""
 Tip: To save space with utf8mb4, use VARCHAR instead of CHAR. Otherwise, MySQL
must reserve four bytes for each character in a CHAR CHARACTER SET utf8mb4
column because that is the maximum possible length. For example, MySQL must
reserve 40 bytes for a CHAR(10) CHARACTER SET utf8mb4 column. 
"""

https://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html

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