https://bbs.huaweicloud.com/blogs/108394
http://docs-aliyun.cn-hangzhou.oss.aliyun-inc.com/assets/attach/35264/cn_zh/1468918966631/%E9%98%BF%E9%87%8C%E4%BA%91%20%E4%BA%91%E6%95%B0%E6%8D%AE%E5%BA%93RDS%E7%89%88%20%E6%80%A7%E8%83%BD%E7%99%BD%E7%9A%AE%E4%B9%A6(MySQL).pdf