Why are information_schema and performance_schema not utf8mb4 (and should I care)?
I have been going through my MariaDB installation with a fine-toothed comb trying to update everything from utf8 (3-byte flavor) to utf8mb4. It's correct in my.cnf, all my databases, and all applicable tables and columns thereof. And when I create new databases with no options, it does create them with the correct collation. But see this screenshot of Adminer - two of the three infrastructure databases are still utf8. Is this okay? If not, how should I change them? This server isn't live yet, but it's very close to ready, so I'd rather not do something stupid and break the DB engine.
Do not change anything in mysql, performance_schema, or information_schema.
Beware of any indexed VARCHAR(255) CHARACTER SET utf8 -- they will have trouble with a limit of 767 bytes on the index.
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