Comments - Spurious - "Access denied for user 'root'@'localhost' (using password: NO)" in the /var/log/mysql/error.log.1 file
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Excellent suggestions. I've been ignoring it, but recently I became very interested in learning a lot more about the internals of MariaDB based on the suggestions of the "Advisor". It will take me a while to follow-up on your suggestions. In the meantime, I will identify this question as solved.