Mysqldump 抱怨我从未指定的命令行选项。我没有 shell 别名，也没有自定义的 .my.cnf 文件集。我究竟做错了什么？
使用--database长选项：
$ mysqldump --user cloud -p --database cloud > backup.mysqldb
Warning: Using unique option prefix database instead of databases is deprecated and will be removed in a future release. Please use the full name instead.
Warning: mysqldump: ignoring option '--databases' due to invalid value 'cloud'
Warning: Using unique option prefix database instead of databases is deprecated and will be removed in a future release. Please use the full name instead.
使用--databases …
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