https://www.alibabacloud.com/en/news/product/persistent-connections-are-supported-by-the-database-proxy-feature-for-apsaradb-rds-for-mysql-instances-that-run-rds-cluster-edition-jln?_p_lc=1
Persistence connections help avoid service interruptions and ensure the business continuity and high availability of your applications.
persistent connectionsdatabaseproxyfeature