Comments (2)
There's a reason why we still use latin1 on fields that can only contain ascii chars (like mail address or domain).
MySQL has a limit on the index length (767 bytes).
Why do I mention that?
- with latin1 encoding, each char is one byte.
- with utf8 encoding, each char is 3 bytes
- with utf8mb4 encoding, each char is 4 bytes
We use varchar(255) for most fields, and that means:
- if we need an index covering more than one column, those columns must be latin1 so that the index can span up to 3 columns
- an utf8 varchar(255) (3 * 255 = 765 bytes) exactly fits into the allowed index length
- an utf8mb4 varchar(255) (4 * 255 = 1020) is too big for being indexed - we'd have to limit the index to 3/4 of the field length, and this is obviously a bad idea if it needs to be an UNIQUE index ;-)
So - if this was just a general request because utf8mb4 is cool, please understand that we won't do that.
If you noticed a specific field that needs to be changed to utf8 or even utf8mb4, please tell us which table/field needs to change, and we'll probably change/fix it ;-)
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Thanks for the detailed explanation, Christian.
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