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Not exactly a duplicate @akuzminsky. The other question is about dropping "a database," while this is appears to be about the mysql system database -- dropping it is a much more significant problem, since the server is now in a very unstable state, assuming it's still running at all (and it certainly will not restart, if stopped). Icebergs ahead.
mysqlsystem database -- dropping it is a much more significant problem, since the server is now in a very unstable state, assuming it's still running at all (and it certainly will not restart, if stopped). Icebergs ahead.