ApsaraDB for RDS is a stable, reliable, and automatically scalable online database service. Based on the Apsara distributed file system of Alibaba Cloud and the full SSD high-performance storage, RDS provides a complete set of solutions for disaster tolerance, backup, recovery, monitoring, and migration to free you from the burden of database O&M. RDS supports a variety of engines such as MySQL, SQL Server, PostgreSQL, and PPAS which is highly compatible with Oracle.
RDS supports two billing methods: Pay-As-You-Go and Subscription. You can configure the RDS instance specifications according to the service load. In terms of the two billing methods:
You can upgrade and downgrade the specifications of a Pay-As-You-Go instance at any time.
You can upgrade the specifications of a Subscription instance at any time, and upgrade and downgrade the specifications upon renewal.
In the case of extreme service load, you can upgrade the instance to the RDS dedicated host specifications to handle unexpected conditions.