Access denied; you need (at least one of) the RELOAD privilege(s) for this operation

1. reload 是 administrative 级的权限，即 server administration；这类权限包括： CREATE USER, PROCESS, RELOAD, REPLICATION CLIENT, REPLICATION SLAVE, SHOW DATABASES, SHUTDOWN, SUPER 2. 这类权限的受权不是针对某个数据库的，所以须使用on *.

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